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Predicting ‘Long COVID Syndrome’ with Help of a Smartphone App

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Zoe COVID Sympton Study Tracker app
Credit: Zoe Global

As devastating as this pandemic has been, it’s truly inspiring to see the many innovative ways in which researchers around the world have enlisted the help of everyday citizens to beat COVID-19. An intriguing example is the COVID Symptom Study’s smartphone-based app, which already has been downloaded millions of times, mostly in the United States and United Kingdom. Analyzing data from 2.6 million app users, researchers published a paper last summer showing that self-reported symptoms can help to predict infection with SARS-CoV-2, the coronavirus that causes COVID-19 [1].

New work from the COVID Symptom Study now takes advantage of the smartphone app to shed more light on Long COVID Syndrome [2], in which people experience a constellation of symptoms long past the time that they’ve recovered from the initial stages of COVID-19 illness. Such symptoms, which can include fatigue, shortness of breath, “brain fog,” sleep disorders, fevers, gastrointestinal symptoms, anxiety, and depression, can persist for months and can range from mild to incapacitating

This latest findings, published in the journal Nature Medicine, come from a team led by Claire Steves and Tim Spector, King’s College London, and their colleagues, and that includes NIH grantee Andrew Chan, Massachusetts General Hospital, Boston, and others supported by the Massachusetts Consortium on Pathogen Readiness. The team began by looking at data recorded between March 24-Sept. 2, 2020 from about 4.2 million app users with an average age of 45, about 90 percent of whom lived in the U.K., with smaller numbers from the U.S. and Sweden.

For this particular study, the researchers decided to focused on 4,182 app users, all with confirmed COVID-19, who had consistently logged in their symptoms. Because these individuals also started using the app when they still felt physically well, the researchers could assess their COVID-19-associated symptoms over the course of the illness.

While most people who developed COVID-19 were back to normal in less than two weeks, the data suggest that one in 20 people with COVID-19 are likely to suffer symptoms of Long COVID that persist for eight weeks or more. About one in 50 people continued to have symptoms for 12 weeks or more. That suggests Long COVID could potentially affect many hundreds of thousands of people in the U.K. alone and millions more worldwide.

The team found that the individuals most likely to develop Long COVID were older people, women, and especially those who experienced five or more symptoms. The nature and order of symptoms, which included fatigue, headache, shortness of breath, and loss of smell, didn’t matter. People with asthma also were more likely to develop long-lasting symptoms, although the study found no clear links to any other pre-existing health conditions.

Using this information, the researchers developed a model to predict which individuals were most likely to develop Long COVID. Remarkably, this simple algorithm—based on age, gender, and number of early symptoms–accurately predicted almost 70 percent of cases of Long COVID. It was also about 70 percent effective in avoiding false alarms.

The team also validated the algorithm’s predictive ability in data from an independent group of 2,472 people with confirmed COVID-19 and a range of symptoms. In this group, having more than five symptoms within the first week also proved to be the strongest predictor of Long COVID. And, again, the model worked quite well in identifying those most likely to develop Long COVID.

These findings come as yet another important reminder of the profound impact of the COVID-19 pandemic on public health. This includes not only people who are hospitalized with severe COVID-19 but, all too often, those who get through the initial period of infection relatively unscathed.

Recently, NIH announced a $1.15 billion investment to identify the causes of Long COVID, to develop ways of treating individuals who don’t fully recover, and, ultimately, to prevent the disorder. We’ve been working diligently in recent weeks to identify the most pressing questions and areas of greatest opportunity to address this growing public health threat. As a first step, NIH is funding an effort to track the recovery paths of at least 40,000 adults and children infected with SARS-CoV-2, to learn more about who develops long-term effects and who doesn’t. If you’d like to find a way to pitch in and help, getting involved in the COVID Symptom Study is as easy as downloading the app.

References:

[1] Real-time tracking of self-reported symptoms to predict potential COVID-19. Menni C, Valdes AM, Freidin MB, Sudre CH, Nguyen LH, Drew DA, Ganesh S, Varsavsky T, Cardoso MJ, El-Sayed Moustafa JS, Visconti A, Hysi P, Bowyer RCE, Mangino M, Falchi M, Wolf J, Ourselin S, Chan AT, Steves CJ, Spector TD. Nat Med. 2020 Jul;26(7):1037-1040. doi: 10.1038/s41591-020-0916-2. Epub 2020 May 11.

[2] Attributes and predictors of long COVID. Sudre CH, Murray B, Varsavsky T, Graham MS, Penfold RS, Bowyer RC, Pujol JC, Klaser K, Antonelli M, Canas LS, Molteni E, Modat M, Jorge Cardoso M, May A, Ganesh S, Davies R, Nguyen LH, Drew DA, Astley CM, Joshi AD, Merino J, Tsereteli N, Fall T, Gomez MF, Duncan EL, Menni C, Williams FMK, Franks PW, Chan AT, Wolf J, Ourselin S, Spector T, Steves CJ. Nat Med. 2021 Mar 10.

Links:

NIH launches new initiative to study to “Long COVID”. 2021 Feb 23. (NIH)

COVID-19 Research (NIH)

Massachusetts Consortium on Pathogen Readiness (Boston)

COVID Symptom Study

Claire Steves (King’s College London, United Kingdom)

Tim Spector (King’s College London)

Andrew Chan (Massachusetts General Hospital, Boston)

NIH Support: National Institute of Diabetes and Digestive and Kidney Diseases


Trying to Make Sense of Long COVID Syndrome

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Credit: NIH

More than 400,000 Americans have now lost their lives to COVID-19. But thousands of others who’ve gotten sick and survived COVID-19 are finding that a full recovery can be surprisingly elusive. Weeks and months after seemingly recovering from even mild cases of COVID-19, many battle a wide range of health problems.

Indeed, new results from the largest global study of this emerging “Long COVID syndrome” highlight just how real and pressing this public health concern really is. The study, reported recently as a pre-print on medRxiv, is based on survey results from more than 3,700 self-described COVID “Long Haulers” in 56 countries [1]. They show nearly half couldn’t work full time six months after unexpectedly developing prolonged symptoms of COVID-19. A small percentage of respondents, thankfully, seemed to have bounced back from brief bouts of Long COVID, though time will tell whether they have fully recovered.

These findings are the second installment from the online Body Politic COVID-19 Support Group and its Patient-Led Research for COVID-19, which consists of citizen scientists with a wide range of expertise in the arts and sciences who are struggling with the prolonged effects of COVID-19 themselves. In an earlier survey, this group provided a first-draft description of Long COVID syndrome, based on the self-reported experiences of 640 respondents.

In the new survey-based study led by Athena Akrami, with Patient-Led Research for COVID-19 and University College London, England, the goal was to characterize the experiences of many more people with Long COVID syndrome. They now define the syndrome as a collection of symptoms lasting for more than 28 days.

This second survey emphasizes the course and severity of more than 200 symptoms over time, including those affecting the heart, lungs, gastrointestinal system, muscles, and joints. It took a particularly in-depth look at neurological and neuropsychiatric symptoms, along with the ability of COVID-19 survivors to return to work and participate in other aspects of everyday life.

The 3,762 individuals who responded to the survey were predominately white females, between the ages of 30 and 60, who lived in the United States. As in the previous survey, the study included adults with symptoms consistent with COVID-19, whether or not the infection had been confirmed by a viral or antibody test. That is a potential weakness of the study, as some of these individuals may have had some other inciting illness. But many of the study’s participants developed symptoms early on in the pandemic, when testing was much more limited than it is now.

More than half never sought hospital care. Only 8 percent said that they’d been admitted to the hospital for COVID-19. And yet, 2,464 respondents reported COVID-19 symptoms lasting six months or longer. Most of the remaining respondents also continued to have symptoms, although they had not yet reached the six-month mark.

Among the most common symptoms were fatigue, worsening of symptoms after physical or mental activity, shortness of breath, trouble sleeping, and “brain fog,” or difficulty thinking clearly. The majority—88 percent—said they coped with some form of cognitive dysfunction or memory loss that to varying degrees affected their everyday lives. That includes the ability to make decisions, have conversations, follow instructions, and drive.

Those who had prolonged symptoms of COVID-19 for more than six months reported contending with about 14 symptoms on average. Most also reported that they’d had a relapse of symptoms, seemingly triggered by exercise, mental activity, or just everyday stress. When surveyed, nearly half of respondents said they’d had to reduce their hours at work due to the severity of their symptoms. Another 22 percent weren’t working at all due to their Long COVID.

The findings show that—even in those people who don’t require hospitalization for severe COVID-19—the condition’s prolonged symptoms are having a major impact on lives and livelihoods, both here and around the world. While the number of people affected isn’t yet known, if even a small proportion of the vast numbers of people infected with COVID-19 develop Long COVID syndrome, it represents a significant public health concern.

Another recent study from China further documents the tendency of COVID-19-related symptoms to linger past the usual recovery time for a respiratory virus [2]. The study, published in Lancet, showed that six months after the onset of illness, more than 75 percent of people hospitalized with COVID-19 in Wuhan between January and May 2020 continued to report at least one symptom. Fatigue, muscle weakness, sleep difficulties, anxiety, and depression all were common. More than half of individuals also had significant persistent lung abnormalities, which were more common in those who’d been more severely ill.

It’s essential for us to learn all we can about how SARS-CoV-2, which is the coronavirus that causes COVID-19, leads to such widespread symptoms. It’s also essential that we develop ways to better treat or prevent these symptoms. The NIH held a workshop last month to summarize what is known and fill in key gaps in our knowledge about Long COVID syndrome, which is clinically known as post-acute sequelae of COVID-19 (PASC). In December, Congress authorized funding for continued research on PASC, including an appropriation of funds for NIH to support continued study of these prolonged health consequences.

As these efforts and others proceed in the coming months, the hope is that we’ll gain much more insight and get some answers soon. And, if you’ve had or are currently experiencing symptoms of COVID-19, there’s still time to share your data by participating in the Patient-Led Research for COVID-19’s second survey.

References:

[1] Characterizing Long COVID in an international cohort: 7 months of symptoms and their impact. David HE et al. Medrxiv. 27 December 27 2020.

[2] 6-month consequences of COVID-19 in patients discharged from hospital: a cohort study. Huang C, Huang L, et al. Lancet. 2021 Jan 16;397(10270):220-232.

Links:

COVID-19 Research (NIH)

Akrami Lab (Sainsbury Wellcome Center, University College London, England)

Patient-led Research for COVID-19

Video: Workshop on Post-Acute Sequelae of COVID-19 (NIH)


Citizen Scientists Take on the Challenge of Long-Haul COVID-19

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Woman frustrated while working
Credit: iStock/Poike

Coronaviruses are a frequent cause of the common cold. Most of us bounce back from colds without any lasting health effects. So, you might think that individuals who survive other infectious diseases caused by coronaviruses—including COVID-19—would also return to normal relatively quickly. While that can be the case for some people, others who’ve survived even relatively mild COVID-19 are experiencing health challenges that may last for weeks or even months. In fact, the situation is so common, that some of these folks have banded together and given their condition a name: the COVID “long-haulers.”

Among the many longer-term health problems that have been associated with COVID-19 are shortness of breath, fatigue, cognitive issues, erratic heartbeat, gastrointestinal issues, low-grade fever, intolerance to physical or mental activity, and muscle and joint pains. COVID-19 survivors report that these symptoms flair up unpredictably, often in different combinations, and can be debilitating for days and weeks at a time. Because COVID-19 is such a new disease, little is known about what causes the persistence of symptoms, what is impeding full recovery, or how to help the long-haulers.

More information is now emerging from the first detailed patient survey of post-COVID syndrome, also known as Long COVID [1]. What’s unique about the survey is that it has been issued by a group of individuals who are struggling with the syndrome themselves. These citizen scientists, who belong to the online Body Politic COVID-19 Support Group, decided to take matters into their own hands. They already had a pretty good grip on what sort of questions to ask, as well as online access to hundreds of long-haulers to whom they could pose the questions.

The citizen scientists’ group, known as the Patient-led Research for COVID-19, brought a lot of talent and creativity to the table. Members reside in the United States, Canada, and England, and none have ever met face to face. But, between their day jobs, managing time differences, and health challenges, each team member spends about 20 hours per week working on their patient-led research, and are now putting the final touches on a follow-up survey that will get underway in the next few weeks.

For their first survey, the group members faced the difficult decision of whom to contact. First, they needed to define long hauler. For that, they decided to target people whose symptoms persisted for more than 2 weeks after their initial recovery from COVID-19. The 640 individuals who responded to the survey were predominately white females between the ages of 30 to 49 who lived in the United States. The members said that the gender bias may stem from women being more likely to join support groups and complete surveys, though there may be a gender component to Long COVID as well. About 10 percent of respondents reported that they had ultimately recovered from this post-COVID syndrome.

Another important issue revolved around COVID-19 testing. Most long-haulers in the online group had gotten sick in March and April, but weren’t so sick that they needed to be hospitalized. Because COVID-19 testing during those months was often limited to people hospitalized with severe respiratory problems, many long-haulers with mild or moderate COVID-like symptoms weren’t tested. Others were tested relatively late in the course of their illness, which can increase the likelihood of false negatives.

The team opted to cast a wide investigative net, concluding that limiting its data to only people who tested positive for COVID-19 might lead to the loss of essential information on long-haulers. It turns out that half of the respondents hadn’t been tested for SARS-CoV-2, the virus that causes COVID-19. The other half was divided almost equally between those who tested positive and those who tested negative. Here are some highlights of the survey’s findings:

Top 10 Symptoms: Respondents were asked to rank their most common symptoms and their relative severity. From highest to lowest, they were: mild shortness of breath, mild tightness of chest, moderate fatigue, mild fatigue, chills or sweats, mild body aches, dry cough, elevated temperature (98.8-100), mild headache, and brain fog/concentration challenges. Highlighting the value of patient-led research, the team was able to assemble an initial list of 62 symptoms that long-haulers often discuss in support groups. The survey revealed common symptoms that have been greatly underreported in the media, such as neurological symptoms. These include brain fog, concentration challenges, and dizziness.

Making a Recovery: Of the 60 respondents who had recovered, the average time to recovery was 27 days. The respondents who had not recovered had managed their symptoms for 40 days on average, with most dealing with health problems for 5 to 7 weeks. The report shows that the chance of full recovery by day 50 is less than 20 percent.

Exercise Capacity: About 65 percent of respondents now consider themselves mostly sedentary. Most had been highly physically active before developing COVID-19. Many long-haulers expressed concern that overexertion causes relapses

Testing. Respondents who reported testing positive for SARS-CoV-2 were tested on average earlier in their illness (by day 10) than those who reported testing negative (by day 16). The team noted that their findings parallel those in a recent published scientific study, which found false-negative rates for current PCR-based assays rose as the time between SARS-CoV-2 infection and testing increased [2]. In that published study, by day 21, the false-negative rate reached 66 percent. Only two symptoms (loss of smell and loss of taste) occurred more frequently in respondents who tested positive; the other 60 symptoms were statistically the same between groups. The citizen scientists speculate that testing is not capturing a subset of COVID patients, and more investigation is required.

Since issuing their survey results on May 11, the team has met with staff from the Centers for Disease Control and Prevention and the World Health Organization. Their work also been mentioned in magazine articles and even cited in some papers published in scientific journals.

In their next survey, these citizen scientists hope to fill in gaps in their first report, including examining antibody testing results, neurological symptoms, and the role of mental health. To increase geographic and demographic diversity, they will also translate the survey into 10 languages. If you’re a COVID-19 long-hauler and would like to find out how to get involved, there’s still time to take part in the next survey.

References:

[1] “What Does COVID-19 Recovery Actually Look Like?” Patient-led Research for COVID-19. May 11, 2020.

[2] Variation in False-Negative Rate of Reverse Transcriptase Polymerase Chain Reaction-Based SARS-CoV-2 Tests by Time Since Exposure. Kucirka LM, Lauer SA, Laeyendecker O, Boon D, Lessler J. Ann Intern Med. 2020 Aug 18;173(4):262-267.

Links:

Coronavirus (COVID-19) (NIH)

Patient-led Research for COVID-19


Study Finds 1 in 10 Healthcare Workers with Mild COVID Have Lasting Symptoms

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People showing symtoms of anosmia, fatigue, and ageusia
Credit: Getty Images

It’s become increasingly clear that even healthy people with mild cases of COVID-19 can battle a constellation of symptoms that worsen over time—or which sometimes disappear only to come right back. These symptoms are part of what’s called “Long COVID Syndrome.”

Now, a new study of relatively young, healthy adult healthcare workers in Sweden adds needed information on the frequency of this Long COVID Syndrome. Published in the journal JAMA, the study found that just over 1 in 10 healthcare workers who had what at first seemed to be a relatively mild bout of COVID-19 were still coping with at least one moderate to severe symptom eight months later [1]. Those symptoms—most commonly including loss of smell and taste, fatigue, and breathing problems—also negatively affected the work and/or personal lives of these individuals.

These latest findings come from the COVID-19 Biomarker and Immunity (COMMUNITY) study, led by Charlotte Thålin, Danderyd Hospital and Karolinska Institutet, Stockholm. The study, launched a year ago, enlisted 2,149 hospital employees to learn more about immunity to SARS-CoV-2, the coronavirus that causes COVID-19.

After collecting blood samples from participants, the researchers found that about 20 percent already had antibodies to SARS-CoV-2, evidence of a past infection. Thålin and team continued collecting blood samples every four months from all participants, who also completed questionnaires about their wellbeing.

Intrigued by recent reports in the medical literature that many people hospitalized with COVID-19 can have persistent symptoms for months after their release, the researchers decided to take a closer look in their COMMUNITY cohort. They did so last January during their third round of follow up.

This group included 323 mostly female healthcare workers, median age of 43. The researchers compared symptoms in this group following mild COVID-19 to the 1,072 mostly female healthcare workers in the study (median age 47 years) who hadn’t had COVID-19. They wanted to find out if those with mild COVID-19 coped with more and longer-lasting symptoms of feeling unwell than would be expected in an otherwise relatively healthy group of people. These symptoms included familiar things such as fatigue, muscle pain, trouble sleeping, and problems breathing.

Their findings show that 26 percent of those who had mild COVID-19 reported at least one moderate to severe symptom that lasted more than two months. That’s compared to 9 percent of participants without COVID-19. What’s more, 11 percent of the individuals with mild COVID-19 had at least one debilitating symptom that lasted for at least eight months. In the group without COVID-19, any symptoms of feeling unwell resolved relatively quickly.

The most common symptoms in the COVID-19 group were loss of taste or smell, fatigue, and breathing problems. In this group, there was no apparent increase in other symptoms that have been associated with COVID-19, including “brain fog,” problems with memory or attention, heart palpitations, or muscle and joint pain.

The researchers have noted that the Swedish healthcare workers represent a relatively young and healthy group of working individuals. Yet, many of them continued to suffer from lasting symptoms related to mild COVID-19. It’s a reminder that COVID-19 can and, in fact, is having a devastating impact on the lives and livelihoods of adults who are at low risk for developing severe and life-threatening COVID-19. If we needed one more argument for getting young people vaccinated, this is it.

At NIH, efforts have been underway for some time to identify the causes of Long COVID. In fact, a virtual workshop was held last winter with more than 1,200 participants to discuss what’s known and to fill in key gaps in our knowledge of Long COVID syndrome, which is clinically known as post-acute sequelae of COVID-19 (PASC). Recently, a workshop summary was published [2]. As workshops and studies like this one from Sweden help to define the problem, the hope is to learn one day how to treat or prevent this terrible condition. The NIH is now investing more than $1 billion in seeking those answers.

References:

[1] Symptoms and functional impairment assessed 8 Months after mild COVID-19 among health care workers. Havervall S, Rosell A, Phillipson M, Mangsbo SM, Nilsson P, Hober S, Thålin C. JAMA. 2021 Apr 7.

[2] Toward understanding COVID-19 recovery: National Institutes of Health workshop on postacute COVID-19. Lerner A, et al. Ann Intern Med, 2021 March 30.

Links:

COVID-19 Research (NIH)

Charlotte Thålin (Karolinska Institutet, Stockholm, Sweden)


Learning from History: Fauci Donates Model to Smithsonian’s COVID-19 Collection

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Not too long after the global coronavirus disease 2019 (COVID-19) pandemic reached the United States, museum curators began collecting material to document the history of this devastating public health crisis and our nation’s response to it. To help tell this story, the Smithsonian Institution’s National Museum of American History recently scored a donation from my friend and colleague Dr. Anthony Fauci, Director of NIH’s National Institute of Allergy and Infectious Diseases.

Widely recognized for serving as a clear voice for science throughout the pandemic, Fauci gave the museum his much-used model of SARS-CoV-2, which is the coronavirus that causes COVID-19. This model, which is based on work conducted by NIH-supported electron microscopists and structural biologists, was 3D printed right here at NIH. By the way, I’m lucky enough to have one too.

Both of these models have “met” an amazing array of people—from presidents to congresspeople to journalists to average citizens—as part of our efforts to help folks understand SARS-CoV-2 and the crucial role of its surface spike proteins. As shown in this brief video, Fauci raised his model one last time and then, ever the public ambassador for science, turned his virtual donation into a memorable teaching moment. I recommend you take a minute or two to watch it.

The donation took place during a virtual ceremony in which the National Museum of American History awarded Fauci its prestigious Great Americans Medal. He received the award for his lifetime contributions to the nation’s ideals and for making a lasting impact on public health via his many philanthropic and humanitarian efforts. Fauci joined an impressive list of luminaries in receiving this honor, including former Secretaries of State Madeleine Albright and General Colin Powell; journalist Tom Brokaw; baseball great Cal Ripken Jr.; tennis star Billie Jean King; and musician Paul Simon. It’s a well-deserved honor for a physician-scientist who’s advised seven presidents on a range of domestic and global health issues, from HIV/AIDS to Ebola to COVID-19.

With Fauci’s model now enshrined as an official piece of U.S. history, the Smithsonian and other museums around the world are stepping up their efforts to gather additional artifacts related to COVID-19 and to chronicle its impacts on the health and economy of our nation. Hopefully, future generations will learn from this history so that humankind is not doomed to repeat it.

It is interesting to note that the National Museum of American History’s collection contains few artifacts from another tragic chapter in our nation’s past: the 1918 Influenza Pandemic. One reason this pandemic went largely undocumented is that, like so many of their fellow citizens, curators chose to overlook its devastating impacts and instead turn toward the future.

Multi-colored artificial flowers
An NIH staff member created these paper flowers from the stickers received over the past several months each time he was screened for COVID-19 at the NIH Clinical Center. Credit: Office of NIH History and Stetten Museum

Today, museum staffers across the country and around the world are stepping up to the challenge of documenting COVID-19’s history with great creativity, collecting all variety of masks, test kits, vaccine vials, and even a few ventilators. At the NIH’s main campus in Bethesda, MD, the Office of NIH History and Stetten Museum is busy preparing a small exhibit of scientific and clinical artifacts that could open as early as the summer of 2021. The museum is also collecting oral histories as part of its “Behind the Mask” project. So far, more than 50 interviews have been conducted with NIH staff, including a scientist who’s helping the hard-hit Navajo Nation during the pandemic; a Clinical Center nurse who’s treating patients with COVID-19, and a mental health professional who’s had to change expectations since the outbreak.

The pandemic isn’t over yet. All of us need to do our part by getting vaccinated against COVID-19 and taking other precautions to prevent the virus’s deadly spread. But won’t it great when—hopefully, one day soon—we can relegate this terrible pandemic to the museums and the history books!

Links:

COVID-19 Research (NIH)

Video: National Museum of American History Presents The Great Americans Medal to Anthony S. Fauci (Smithsonian Institution, Washington, D.C.)

National Museum of American History (Smithsonian)

The Office of NIH History and Stetten Museum (NIH)



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