Each COVID infection piles on more health damage.
“Without ambiguity, our research showed that getting an infection a second, third or fourth time contributes to additional health risks in the acute phase, meaning the first 30 days after infection, and in the months beyond, meaning the long COVID phase,” said senior researcher Dr. Ziyad Al-Aly. He is a clinical epidemiologist at Washington University School of Medicine in St. Louis.
For the study, the investigators analyzed medical records of about 5.8 million patients treated by the U.S. Department of Veterans Affairs, the nation's largest integrated health care system.infections with more than 443,000 people who had been infected once and 5.3 million others who were COVID-free between March 2020 and April 2022.. A small number had four infections, and no one had five or more.
Statistical modeling assessed the health risks of repeat COVID-19 infections within the first month after contracting the virus, and then up to six months after.
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