Skip to main content

COVID-19

Study Highlights Need for Continued Care of COVID-19 Survivors

Posted on by

Collage of people being cared for after contracting COVID-19
Credit: Composed of images from Getty

The past several months have shown that most people hospitalized with COVID-19 will get better. As inspiring as it is to see these patients breathe on their own and converse with their loved ones again, we are learning that many will leave the hospital still quite ill and in need of further care. But little has been published to offer a detailed demographic picture of those being discharged from our nation’s hospitals and the types of community-based care and monitoring that will be needed to keep them on the road to recovery.

A recent study in the journal EClinicalMedicine helps to fill in those gaps by chronicling the early COVID-19 experience of three prominent hospitals in the Boston area: Massachusetts General Hospital, Brigham and Women’s Hospital, and Newton-Wellesley Hospital. These data were reported from a patient registry of 247 middle-aged and older COVID-19 patients. The patients were admitted over three weeks last March into one of these hospitals, which are part of New England’s largest integrated health network.

The data confirm numerous previous reports that COVID-19 disproportionately affects people of color. The researchers, led by Jason H. Wasfy and Cian P. McCarthy, Massachusetts General Hospital and Harvard Medical School, Boston, found a large number of their patients were Hispanic (30 percent) or Black (10 percent). Wasfy said these numbers could be driven by many factors, including a low income, more family members living in one home, greater difficulty accessing healthcare, presence of chronic illness (health disparities), and serving as essential workers during the pandemic.

The researchers also tracked the patients after discharge for about 80 days. About a third of patients left the hospital for a post-acute care facility to continue their rehabilitation. After discharge, many required supplemental oxygen (15 percent), tube feeding (9 percent), or treatment with medications including antipsychotics and prescription painkillers (16 percent). About 10 percent were readmitted to the hospital within weeks or months of their initial discharge.

Wasfy and colleagues also found:

· Many patients undergoing treatment were enrolled in Medicaid (20 percent) or both Medicaid and Medicare (12 percent).

· A substantial number also were retired (36 percent) or unemployed (8.5 percent), highlighting the role of non-occupational spread. Many others worked in the hospitality industry, healthcare, or public transportation.

· A large proportion (42 percent) of hospitalized patients required intensive care. The good news is that most of them (86 percent) ultimately recovered enough to be discharged from the hospital. Tragically, 14 percent—34 of 247 people—died in the hospital.

These findings represent hospitals in just one notable American city hard hit early in the pandemic. But they spotlight the importance of public health efforts to prevent COVID-19 among the most vulnerable and reduce its most devastating social impacts. These are critical points, and NIH has recently begun supporting community engagement research efforts in areas hardest hit by COVID-19. With this support and access to needed post-discharge care, we aim to help more COVID survivors stay on the road to a full recovery.

Reference:

[1] Early clinical and sociodemographic experience with patients hospitalized with COVID-19 at a large American healthcare system. McCarthy CP et al. EClinicalMedicine. August 19, 2020.

Links:

Coronavirus (COVID-19) (NIH)

Massachusetts General Hospital (Boston)

Brigham and Women’s Hospital (Boston)

Newton-Wellesley Hospital (Newton, MA)

Jason Wasfy (Massachusetts General Hospital)


Two Studies Show COVID-19 Antibodies Persist for Months

Posted on by

Antibodies against SARS-CoV-2
Caption: Artistic rendering of SARS-CoV-2 virus (orange) covered with antibodies (white), generated by an immune B cell (gray) at the bottom left. Credit: iStock/selvanegra

More than 8 million people in the United States have now tested positive for COVID-19. For those who’ve recovered, many wonder if fending off SARS-CoV-2—the coronavirus that causes COVID-19—one time means their immune systems will protect them from reinfection. And, if so, how long will this “acquired immunity” last?

The early data brought hope that acquired immunity was possible. But some subsequent studies have suggested that immune protection might be short-lived. Though more research is needed, the results of two recent studies, published in the journal Science Immunology, support the early data and provide greater insight into the nature of the human immune response to this coronavirus [1,2].

The new findings show that people who survive a COVID-19 infection continue to produce protective antibodies against key parts of the virus for at least three to four months after developing their first symptoms. In contrast, some other antibody types decline more quickly. The findings offer hope that people infected with the virus will have some lasting antibody protection against re-infection, though for how long still remains to be determined.

In one of the two studies, partly funded by NIH, researchers led by Richelle Charles, Massachusetts General Hospital, Boston, sought a more detailed understanding of antibody responses following infection with SARS-CoV-2. To get a closer look, they enrolled 343 patients, most of whom had severe COVID-19 requiring hospitalization. They examined their antibody responses for up to 122 days after symptoms developed and compared them to antibodies in more than 1,500 blood samples collected before the pandemic began.

The researchers characterized the development of three types of antibodies in the blood samples. The first type was immunoglobulin G (IgG), which has the potential to confer sustained immunity. The second type was immunoglobulin A (IgA), which protects against infection on the body’s mucosal surfaces, such as those found in the respiratory and gastrointestinal tracts, and are found in high levels in tears, mucus, and other bodily secretions. The third type is immunoglobulin M (IgM), which the body produces first when fighting an infection.

They found that all three types were present by about 12 days after infection. IgA and IgM antibodies were short-lived against the spike protein that crowns SARS-CoV-2, vanishing within about two months.

The good news is that the longer-lasting IgG antibodies persisted in these same patients for up to four months, which is as long as the researchers were able to look. Levels of those IgG antibodies also served as an indicator for the presence of protective antibodies capable of neutralizing SARS-CoV-2 in the lab. Even better, that ability didn’t decline in the 75 days after the onset of symptoms. While longer-term study is needed, the findings lend support to evidence that protective antibody responses against the novel virus do persist.

The other study came to very similar conclusions. The team, led by Jennifer Gommerman and Anne-Claude Gingras, University of Toronto, Canada, profiled the same three types of antibody responses against the SARS-CoV-2 spike protein, They created the profiles using both blood and saliva taken from 439 people, not all of whom required hospitalization, who had developed COVID-19 symptoms from 3 to 115 days prior. The team then compared antibody profiles of the COVID-19 patients to those of people negative for COVID-19.

The researchers found that the antibodies against SARS-CoV-2 were readily detected in blood and saliva. IgG levels peaked about two weeks to one month after infection, and then remained stable for more than three months. Similar to the Boston team, the Canadian group saw IgA and IgM antibody levels drop rapidly.

The findings suggest that antibody tests can serve as an important tool for tracking the spread of SARS-CoV-2 through our communities. Unlike tests for the virus itself, antibody tests provide a means to detect infections that occurred sometime in the past, including those that may have been asymptomatic. The findings from the Canadian team further suggest that tests of IgG antibodies in saliva may be a convenient way to track a person’s acquired immunity to COVID-19.

Because IgA and IgM antibodies decline more quickly, testing for these different antibody types also could help to distinguish between an infection within the last two months and one that more likely occurred even earlier. Such details are important for filling in gaps in our understanding COVID-19 infections and tracking their spread in our communities.

Still, there are rare reports of individuals who survived one bout with COVID-19 and were infected with a different SARS-CoV-2 strain a few weeks later [3]. The infrequency of such reports, however, suggests that acquired immunity after SARS-CoV-2 infection is generally protective.

There remain many open questions, and answering them will require conducting larger studies with greater diversity of COVID-19 survivors. So, I’m pleased to note that the NIH’s National Cancer Institute (NCI) recently launched the NCI Serological Sciences Network for COVID19 (SeroNet), now the nation’s largest coordinated effort to characterize the immune response to COVID-19 [4].

The network was established using funds from an emergency Congressional appropriation of more than $300 million to develop, validate, improve, and implement antibody testing for COVID-19 and related technologies. With help from this network and ongoing research around the world, a clearer picture will emerge of acquired immunity that will help to control future outbreaks of COVID-19.

References:

[1] Persistence and decay of human antibody responses to the receptor binding domain of SARS-CoV-2 spike protein in COVID-19 patients. Iyer AS, Jones FK, Nodoushani A, Ryan ET, Harris JB, Charles RC, et al. Sci Immunol. 2020 Oct 8;5(52):eabe0367.

[2] Persistence of serum and saliva antibody responses to SARS-CoV-2 spike antigens in COVID-19 patients. Isho B, Abe KT, Zuo M, Durocher Y, McGeer AJ, Gommerman JL, Gingras AC, et al. Sci Immunol. 2020 Oct 8;5(52):eabe5511.

[3] What reinfections mean for COVID-19. Iwasaki A. Lancet Infect Dis, 2020 October 12. [Epub ahead of print]

[4] NIH to launch the Serological Sciences Network for COVID-19, announce grant and contract awardees. National Institutes of Health. 2020 October 8.

Links:

Coronavirus (COVID-19) (NIH)

Charles Lab (Massachusetts General Hospital, Boston)

Gingras Lab (University of Toronto, Canada)

Jennifer Gommerman (University of Toronto, Canada)

NCI Serological Sciences Network for COVID-19 (SeroNet) (National Cancer Institute/NIH)

NIH Support: National Institute of Allergy and Infectious Diseases; National Institute of General Medical Sciences; National Cancer Institute


Building Resilience During the COVID-19 Pandemic

Posted on by

Drs. Collins and Everly on a virtual chat

Dating back to our earliest times, humankind has experienced the psychological impact of a wide range of catastrophes, including famines, floods, earthquakes, wildfires, windstorms, wars, and, last but certainly not least, outbreaks of potentially deadly infectious diseases. We are certainly no exception today as people try to figure out how to cope—and help others cope—with the grief, stress, and anxiety caused by biggest health challenge of our time: the coronavirus 2019 (COVID-19) pandemic.

With more than 215,000 Americans having lost their lives and more than 7.8 million infected since COVID-19 first gripped our nation, the pandemic has taken a profound psychological and emotional toll on us all. Still, behavioral and social science researchers have identified some strategies to help us deal with our fears, and even rise to the challenge of supporting others during this unprecedented time.

Recently, I had an opportunity to discuss the science behind mental health responses to disasters with Dr. George Everly Jr., a psychologist and professor at the Johns Hopkins University Bloomberg School of Public Health, Baltimore. A world-renowned expert with more than 40 years experience studying the psychological impacts of disasters, he co-founded the International Critical Incident Stress Foundation, an organization affiliated with the United Nations. Our conversation took place via videoconferencing from our home offices in Maryland. Here’s a condensed transcript of our chat:

Collins: Good morning! At NIH, we are doing everything we can to keep our scientific mission going by supporting groundbreaking research into COVID-19 and a lot of other things. We’re also deeply committed to helping people manage stress and attend to mental health. So, we’ve invited Dr. Everly to share insights that I believe will help us learn some skills to build resilience. Goodness knows, this is a time where we all need resilience, as well as to help others around us. We’re all called upon, I think, to look after our friends and neighbors in the aftermath of a circumstance like the current pandemic.

Everly: It’s a privilege to spend some time with you today and chat about such an important topic. The topic we typically think about in terms of disasters is the physical response. Today, we’ll talk about the psychological impact of the COVID-19 pandemic. This is actually my third pandemic, having consulted in Hong Kong with SARS and Singapore with H1N1. I’ve also done consulting with Ebola.

However, I will tell you that this pandemic, COVID-19, has been the most challenging. I think we can we agree that mental health is an intrinsic value as it relates to us as humans. Anything that threatens mental health, especially in large numbers, threatens the core fabric of society.

According to the United Nations, we may now be looking at an impending international mental health crisis. Some have called this the “hidden” pandemic: people who previously coped well may have challenges and people who had challenges coping before COVID-19 may have increased challenges. Looking at first responders and frontline workers, we have seen heroic efforts on their part, but not without consequences—and mental exhaustion may be one of them

Collins: How is this crisis similar—and how is it different—from most of the disasters that people have dealt with?

Everly: The first thing is expectations. If we expected COVID-19 to be short lived, we have been remarkably, if not catastrophically, disappointed.

So, this connection occurred to me. A number of years ago, I was interested in the psychological impact of the London Blitz, and I went to England to interview people who went through that night upon night upon night of intractable bombing during World War II. I wanted to find out what helped people make it through. It was very clear that their initial belief that the bombing would be short-lived was tragically violated. They then as a community understood that they had to shift into a different mindset, and realize the Blitz wasn’t a sprint—it was marathon. They’d originally sent their children out into the countryside, but later decided to bring them back in the midst of bombing. I will suggest that psychologically, that was the turn of the war. In fact, research later by Anna Freud found that sending the kids away was psychologically more injurious than keeping them in the city. And I think that’s really important. Realizing that we are in for a long haul with COVID-19, in and of itself may be a game changer.

Collins: A very interesting comparison. I hadn’t thought about it that way—an acute disease becoming chronic.

Tell us a little bit more about the undercurrent of malaise in our country even before this COVID-19 pandemic hit—what economists Angus Deaton and Anne Case have recently written about as the “deaths of despair” and the opioid crisis. We are facing a pandemic from coronavirus, but it didn’t land on a completely blank page. It landed in a circumstance where many people were already feeling significant stress, and where depression was increasing risks of overdoses and suicide.

Everly: Fantastic question. You probably remember the work of Hans Selye, an endocrinologist who actually coined the term “stress.” He said, at any given point in time, we have a limited supply of what he called “adaptive energy.” In the best of conditions, this reservoir is quite high and will allow us to meet unusual challenges. However, I would suggest that the background noise of chronic issues that predated COVID-19 did begin to deplete that reservoir of adaptive energy, making us more vulnerable to things that turned out to be far more challenging than we thought. We were starting with one foot in the hole, so to speak.

Collins: All the more reason why our resilience is being called upon. Piled on top of it, many people are facing the serious challenge of trying to telework from home and trying to manage their responsibilities in terms of children or other family members who need care. My heart goes out to those folks as they struggle with this shared set of responsibilities, probably feeling as if there aren’t enough hours in the day and distractions are always getting in the way.

People are also feeling stressed now about the health of their children. What do we know—and what should we be thinking about—in terms of the mental health impact of the COVID-19 pandemic on kids?

Everly: In the spirit of full disclosure, I’m not a child psychologist. But I have studied trauma, crisis, and disaster for quite a while, and, invariably, children are part of that. One of the most powerful things I have seen in my career is that children often become reflections of their parents. Children not only desire, but they need, stability. My message to parents is that your children rely on you. You must be that strength for them. Even when you think you can’t be strong for yourself, reach down deep inside and say, “This isn’t just about you; it’s about others as well.”

I’ve got three young grandchildren, and this is the message I am telling their parents: “This is an important time. This may be one of the defining milestones in your children’s development. It’s an opportunity to show them how to cope.”

Collins: I have grandkids as well and have been watching how they have adapted. In some instances, I can see how they have actually gained in strength, as they’ve learned that this is an opportunity to face up to a challenge and learn how to cope. It does seem to be a mix of providing that foundation of support, but trying not to prevent children completely from having the experience of realizing they can get through some things themselves.

Everly: We can certainly be overprotective. From studying Olympic athletes, we learned that when they were asked what helped them reach the elite tier and win Olympic medals, they answered: challenge, plus adequate support. While well-intended, I think support alone is misdirected.

Collins: That makes sense. I know, during the current crisis, there is an interest in figuring out, in scientifically rigorous ways, what mental health interventions seem to produce good outcomes. Tell me a little bit more about where we stand as far as the opportunities to be doing these sorts of trials of various interventions. It would be a shame to go through this and then say to ourselves, “We missed a great opportunity there to learn more.”

Everly: It’s tough to do a randomized, controlled trial in the middle of a disaster. There are quite literally ethical issues at play. So, we approximate as best we can. For example, in the past, we built our own model of Psychological First Aid and tested it in two randomized controlled trials and three content validation studies, as well as in structural equation modeling studies. Have we tested it in this current environment? Not yet. There may be others doing that—I’m not sure.

If you take a look at the Cochrane Review on resiliency programs, you will perhaps be a little surprised. The review says there’s not a compelling body of evidence that resiliency programs work. However, we believe they work. We know there is this thing called human resilience and we encourage everyone to keep on trying to study it in scientifically rigorous ways.

Collins: I’m glad that you are. We should not miss the opportunity here to learn, because this is probably not our last pandemic—or our last crisis. Any final words?

Everly: So, with the caveat that I’m a diehard optimist …

Collins: That’s okay. I am too!

Everly: … I truly believe that from the greatest adversities, opportunities can emerge. When I spent three years in New York working after the 9/11 terrorist attack, I thought this is the defining moment, not just of my generation, but of others. I got to see it up close and personal, and worked intimately with various agencies. And I did see opportunities. As a result of 9/11, we changed not just the way we go through airports, but the way we look at trauma from a public health standpoint. Perhaps for the first time, we realized that we need to take a far more active preventative and interventional role.

Now, history repeats itself. I believe that this pandemic will change us for the rest of my life—and I don’t think all those changes need be negative. I think there are huge opportunities. I certainly am eager to investigate this at the highest levels of science. Let’s see why things work when they work and why things don’t work. Then, let’s use that information to build programs and test them in randomized, controlled trials.

I think we will come out of this pandemic better than we went into it. I would encourage people to understand that we’re in this together. Way back in the mid-1800s, Darwin told us that the greatest predictor of resilience was collaboration and cohesiveness. This is a time to reach out to each other.

Collins: I totally agree with that. You’re making a really good point: social distancing doesn’t have to mean anything more than physical distancing. We can stay socially close and reach out to each other in different ways.
We’re going to get through this, but get through it in a way that will change us. We will be changed by becoming stronger and more resilient, having learned some lessons about ourselves and about each other. We cannot simply hide our heads under our pillows and wait for this to pass. When you wake up in the morning, say to yourself: “I’m engaged in something that matters. I’m not just a passive victim of this terrible pandemic. I’m trying to do what I can and work toward getting us through.”

Many thanks, Professor Everly, for all your good work and for giving us this time to reflect on this important area of research and how to make the most of it.

Links:

Coronavirus (COVID-19) (NIH)

George S. Everly (Johns Hopkins University Bloomberg School of Public Health/Baltimore)

Video: Coping with the Mental Health Effects of COVID-19, George Everly with Francis Collins (NIH VideoCast)

The Power of Psychological First Aid. Dome. Minkove JF. March/April 2018. (Johns Hopkins Medicine/Baltimore)

Coping with Stress (Centers for Disease Control and Prevention)

Coping With Stress During Infectious Disease Outbreaks (Substance Abuse and Mental Health Services Administration)

Talking with Children: Tips for Caregivers, Parents, and Teachers during Infectious Disease Outbreaks. (SAMHSA)

National Suicide Prevention Lifeline

SAMHSA’s Disaster Distress Helpline, 1-800-985-5990

National Suicide Prevention Hotline, 1-800-273-TALK (8255); TTY number 1-800-799-4TTY (4889)


COVID-19 Vaccine Appears Well-Tolerated and Effective in Developing Antibodies in Small Study of Older Adults

Posted on by

Bandage after vaccine
Credit: iStock/BackyardProduction

It’s been truly breathtaking to watch the progress being made on a daily basis to develop safe and effective vaccines for SARS-CoV-2, the novel coronavirus that causes COVID-19. Indeed, months sooner than has ever been possible for a newly emerging infection, several promising vaccines are already working their way through Phase 3 studies, the final stage of clinical evaluation. I remain optimistic that we will have one or more vaccines that prove to be safe and effective by January 2021.

But, as encouraging as the early data have been, uncertainty has remained over whether vaccines that appear safe and effective in developing antibodies in younger adults will work as well in older people, too. It’s a critical issue given that older individuals also are at greater risk for severe or life-threatening illness if they do get sick from COVID-19.

So, I’m pleased to highlight some recent findings, published in the New England Journal of Medicine [1], from an early Phase 1 clinical trial that was expanded to include 40 adults over age 55. While we eagerly await the results of ongoing and larger studies, these early data suggest that an innovative COVID-19 vaccine co-developed by NIH’s Vaccine Research Center (VRC), in partnership with Moderna Inc., Cambridge, MA, is both well tolerated and effective in generating a strong immune response when given to adults of any age.

The centerpiece of the vaccine in question, known as mRNA-1273, is a small, non-infectious snippet of messenger RNA (mRNA). When this mRNA is injected into muscle, a person’s own body will begin to make the key viral spike protein. As the immune system detects this spike protein, it spurs the production of antibodies that may help to fend off the novel SARS-CoV-2.

Earlier findings from the NIH-supported phase 1 human clinical trial found mRNA-1273 was safe and effective in generating a vigorous immune response in people ages 18 to 55, when delivered in two injections about a month apart. Based on those findings, a large Phase 3 clinical trial is currently enrolling 30,000 volunteers, with results expected in the next few weeks [2]. But, given that immune response to many other vaccines tends to grow weaker with age, how well would this new COVID-19 vaccine work for older individuals?

To find out, a team at Kaiser Permanente Washington Health Research Institute, Seattle, and Emory University School of Medicine, Atlanta, expanded the initial Phase 1 trial to include 20 healthy volunteers ages 56 to 70 and another 20 healthy volunteers ages 71 and older. Ten volunteers in each of the two older age groups received a lower dose of the vaccine (25 micrograms) in two injections given about a month apart. The other 10 in each age group received a higher dose (100 micrograms), given on the same schedule.

Here’s what they found:

• No volunteers suffered serious adverse events. The most common adverse events were mild-to-moderate in severity and included headache, fatigue, muscle aches, chills and pain at the injection site. Those symptoms occurred most often after the second dose and in individuals receiving the higher dose of 100 micrograms.

• Volunteers showed a rapid production of protective antibodies against the spike protein following immunization. After the second injection, all participants showed a strong immune response, with production of robust binding and neutralizing antibodies against SARS-CoV-2.

• The higher dose of 100 micrograms safely produced a stronger immune response compared to the lower dose, supporting its use in larger clinical studies.

• Most importantly, the immune response observed in these older individuals was comparable to that seen previously in younger adults.

The researchers will continue to follow the volunteer trial participants of all ages for about a year to monitor the vaccine’s longer-term effects. But these findings provided support for continued testing of this promising vaccine in older adults in the ongoing Phase 3 clinical trial.

There are currently four SARS-CoV-2 vaccines in phase 3 clinical trials in the United States (though two are currently on hold). Trials of two more vaccines are expected start in the next month or two.

It is not known whether all of these vaccines will have the same vigorous immune response in older individuals that has been demonstrated for this one. But if more than one of these vaccines turns out to be safe and effective, it will be important to know about the response in various populations, so that distribution to high-risk groups can be planned accordingly.

References:

[1] Safety and immunogenicity of SARS-CoV-2 mRNA-1273 vaccine in older adults. Anderson EJ, Rouphael NG, Widge AT, Jackson LA, Roberts PC, Makhene M, Chappell JD, Denison MR, Stevens LJ, Pruijssers AJ, McDermott AB, Flach B, Lin BC, Doria-Rose NA, O’Dell S, Schmidt SD, Corbett KS, Swanson PA 2nd, Padilla M, Neuzil KM, Bennett H, Leav B, Makowski M, Albert J, Cross K, Edara VV, Floyd K, Suthar MS, Martinez DR, Baric R, Buchanan W, Luke CJ, Phadke VK, Rostad CA, Ledgerwood JE, Graham BS, Beigel JH; mRNA-1273 Study Group. N Engl J Med. 2020 Sep 29.

[2] “Phase 3 clinical trial of investigational vaccine for COVID-19 begins.” National Institutes of Heath. July 27, 2020

Links:

Coronavirus (COVID-19) (NIH)

COVID-19 Prevention Network (National Institute of Allergy and Infectious Diseases/NIH)

Dale and Betty Bumpers Vaccine Research Center (National Institute of Allergy and Infectious Diseases/NIH)

Moderna, Inc. (Cambridge, MA)

Safety and Immunogenicity Study of 2019-nCoV Vaccine (mRNA-1273) for Prophylaxis of SARS-CoV-2 Infection (COVID-19) (ClinicalTrials.gov)

NIH Support: National Institute of Allergy and Infectious Diseases


Rogue Antibodies and Gene Mutations Explain Some Cases of Severe COVID-19

Posted on by

SARS-CoV-2
Caption: Colorized scanning electron micrograph of a dying cell (blue) heavily infected with SARS-CoV-2 virus particles (yellow), isolated from a patient sample. Credit: National Institute of Allergy and Infectious Diseases, NIH

One of the many perplexing issues with COVID-19 is that it affects people so differently. That has researchers trying to explain why some folks bounce right back from the virus, or don’t even know they have it—while others become critically ill. Now, two NIH-funded studies suggest that one reason some otherwise healthy people become gravely ill may be previously unknown trouble spots in their immune systems, which hamper their ability to fight the virus.

According to the new findings in hundreds of racially diverse people with life-threatening COVID-19, a small percentage of people who suffer the most severe symptoms carry rare mutations in genes that disrupt their antiviral defenses. Another 10 percent with severe COVID-19 produce rogue “auto-antibodies,” which misguidedly disable a part of the immune system instead of attacking the virus.

Either way, the outcome is the same: the body has trouble fending off SARS-CoV-2, the novel coronavirus that causes COVID-19. The biological reason is there’s not enough of an assortment of signaling proteins, called type I interferons, that are crucial to detecting dangerous viruses like SARS-CoV-2 and sounding the alarm to prevent serious illness.

The research was led by Jean-Laurent Casanova, Howard Hughes Medical Institute and The Rockefeller University, New York; and the Imagine Institute, Necker Hospital, Paris. Casanova and his team began enrolling people with COVID-19 last February, with a particular interest in young adults battling severe illness. They were curious whether inherent weaknesses in their immune systems might explain their surprising vulnerability to the virus despite being otherwise young and healthy. Based on earlier findings in other infectious illnesses, they were especially interested in a set of 13 genes involved in interferon-driven immunity.

In their first study, published in the journal Science, researchers compared this set of genes in 659 patients with life-threatening COVID-19 to the same genes in 534 people with mild or asymptomatic COVID-19 [1]. It turned out that 23, or 3.5 percent, of people with severe COVID-19 indeed carried rare mutations in genes involved in producing antiviral interferons. Those unusual aberrations never turned up in people with milder disease. The researchers went on to show in lab studies that those genetic errors leave human cells more vulnerable to SARS-CoV-2 infection.

The discovery was certainly intriguing, but given the rarity of those mutations, it doesn’t explain most instances of severe COVID-19. Still, it did give Casanova’s team another idea. Perhaps some other people who suffer from severe COVID-19 lack interferons too, but for different reasons. Perhaps their bodies were producing rogue antibodies that were crippling their own antiviral defenses.

In their second study, also in Science, that’s exactly what researchers found in 101 of 987 (over 10 percent) patients from around the world with life-threatening COVID-19 [2]. In the bloodstreams of such individuals, they detected auto-antibodies against an assortment of interferon proteins. Those antibodies, which blocked the interferons’ antiviral activity, weren’t found in people with more mild cases of COVID-19.

Interestingly, the vast majority of patients with those harmful antibodies were men. The findings might help to explain the observation that men are at greater risk than women for developing severe COVID-19. The patients with auto-antibodies also were slightly older, with about half over the age of 65.

Many questions remain. For instance, it’s not yet clear what drives the production of those debilitating auto-antibodies. Might there be more mutations in antiviral defense-related genes that researchers have yet to discover? Is it possible that interferon treatment may help some people with severe COVID-19? Such treatment may be difficult in patients with auto-antibodies, although some clinical trials to explore this possibility already are underway.

The findings, if confirmed, have some potentially immediate implications. It’s possible that screening patients for the presence of damaging auto-antibodies might help to identify those at greater risk for progressing to severe disease. Treatments to remove those antibodies from the bloodstream or to boost antiviral defenses in other ways also may help. Ideally, it would be a good idea to make sure donated convalescent plasma now being tested in clinical trials as a treatment for severe COVID-19 doesn’t contain such disruptive auto-antibodies.

These new findings come from an international effort involving hundreds of scientists called the COVID Human Genetic Effort. Besides its ongoing efforts to understand severe COVID-19, Casanova says his team is also taking a look at the other side of the coin: how some people who’ve been exposed to severe COVID-19 in their own households manage to not get sick. A related international group called the COVID-19 Host Genetics Initiative is pursuing similar goals. Such insights will be invaluable as we continue to manage and treat COVID-19 patients in the future.

References:

[1] Inborn errors of type I IFN immunity in patients with life-threatening COVID-19. Zhang Q, Bastard P, Liu Z, Le Pen J, Moncada-Velez M, Gorochov G, Béziat V, Jouanguy E, Sancho-Shimizu V, Rice CM, Abel L, Notarangelo LD, Cobat A, Su HC, Casanova JL et al. Science. 2020 Sep 24:eabd4570. [Published online ahead of print.]

[2] Auto-antibodies against type I IFNs in patients with life-threatening COVID-19. Bastard P, Rosen LB, Zhang Q, Michailidis E, Hoffmann HH, Gorochov G, Jouanguy E, Rice CM, Cobat A, Notarangelo LD, Abel L, Su HC, Casanova JL et al. Science. 2020 Sep 24:eabd4585. [Published online ahead of print.]

Links:

Coronavirus (COVID-19) (NIH)

Interferons (Alpha, Beta) (NIH)

Interferons. Taylor MW. Viruses and Men: A History of Interactions. 2014 July 22. (Pubmed)

Video: Understanding the underlying genetics of COVID-19, Jean-Laurent Casanova (Youtube)

Jean-Laurent Casanova (The Rockefeller University, New York)

COVID Human Genetic Effort

NIH Support: National Institute of Allergy and Infectious Diseases


Next Page