Risk of long COVID in kids doubles after second infection

(Press-News.org) Children and adolescents were twice as likely to experience long COVID after catching COVID for the second time, compared to their peers with a single previous infection, according to a large study funded by the National Institutes of Health (NIH) and published in Lancet Infectious Diseases. These results run counter to the popular perceptions that COVID in children is "mild" and that reinfections with COVID do not carry the same risk of long COVID that initial infections do.

Among the conditions associated with long COVID in youth, myocarditis (swelling of the heart muscle that can weaken the heart and even prove fatal) was most common with the risk tripling after a second COVID infection compared to the initial infection. Blood clots in children were more than twice as likely after a second COVID infection. Kids were also at increased risk for many other conditions after getting COVID twice, including damaged kidneys, abnormal heartbeats, headache, abdominal pain and severe fatigue.

          “The results of this study further support one of the strongest reasons I give patients, families and physicians about getting vaccinated: More vaccines should lead to fewer infections, which should lead to less long COVID,” said co-author Ravi Jhaveri, MD, Head of Pediatric Infectious Diseases at Ann & Robert H. Lurie Children's Hospital of Chicago and Professor of Pediatrics at Northwestern University Feinberg School of Medicine.

Researchers analyzed data from electronic health records (EHR) of more than 465,000 children and adolescents from January 1, 2022, to October 13, 2023, when Omicron was the dominant variant. This study is part of the NIH-funded RECOVER Initiative, which includes 40 U.S. children’s hospitals and health institutions and aims to learn about the long-term effects of COVID. The current study is the first and largest longitudinal EHR-based investigation of long COVID following reinfection in children and adolescents.

“The level of coordination, data sharing, and analysis requires massive infrastructure and sustained support,” said senior author Yong Chen, PhD, a Professor of Biostatistics and the Director of PennCIL at the Perelman School of Medicine at the University of Pennsylvania. “Without this investment, we wouldn’t have had access to such a large and diverse pediatric population, nor the capacity to rigorously evaluate long COVID in a way that is applicable across many different levels of care.”

Moving forward, researchers plan to track data on pediatric patients that span longer periods of time, examine whether newer COVID variants change the risk pattern, and explore specific strategies that might help prevent severe long-term effects.

Dr. Jhaveri holds the Virginia H. Rogers Professorship in Infectious Disease at Lurie Children’s.

Ann & Robert H. Lurie Children’s Hospital of Chicago is a nonprofit organization committed to providing access to exceptional care for every child. It is the only independent, research-driven children’s hospital in Illinois and one of less than 35 nationally. This is where the top doctors go to train, practice pediatric medicine, teach, advocate, research and stay up to date on the latest treatments. Exclusively focused on children, all Lurie Children’s resources are devoted to serving their needs. Research at Lurie Children’s is conducted through Stanley Manne Children’s Research Institute, which is focused on improving child health, transforming pediatric medicine and ensuring healthier futures through the relentless pursuit of knowledge. Lurie Children’s is the pediatric training ground for Northwestern University Feinberg School of Medicine. It is ranked as one of the nation’s top children’s hospitals by U.S. News & World Report.

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