Throughout the pandemic, the prevailing thought was that if you got COVID-19, you would have immunity from the virus for around 90 days. But lately, more people have been reporting COVID symptoms more than once in the same month.
"The only way to know for sure that someone has been re-infected is to compare the virus they had originally with the virus they had the second time and show that those are different viruses from a molecular sequencing perspective," he said.
"You can't go back to that person's test from a month ago and sequence it to say it's the same or different," she pointed out."Most of the epidemiological data would suggest people are generally protected for a couple months," Kuritzkes said."But there's a caveat to that as well. If you're exposed to a completely different strain, then that new second infection could happen sooner than a few months.
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