'A long-term pattern' According to some infectious disease researchers, Covid-19 reinfections are likely to become more common as time goes on and different variants continue to circulate—with some people potentially seeing third or fourth reinfections within a year.

How long do COVID symptoms last? Those with a mild case of COVID-19 usually recover in one to two weeks. For severe cases, recovery can take six weeks or more, and for some, there may be lasting symptoms with or without damage to the heart, kidneys, lungs and brain.

Two-plus years into the COVID-19 pandemic, scientists still aren't sure how long people who catch coronavirus remain infectious, The Wall Street Journal reports.

Most people with COVID-19 are no longer contagious 5 days after they first have symptoms and have been fever-free for at least three days.