Just a word of warning to readers who have been infected by COVID and believe that they are now immune. It ain't necessarily so-- as my son and his wife found out the hard way, having been reinfected less than a year after their first bout. The ER doctor attributed the reinfection to one of the variants. He said that he had encountered no one reinfected with the original strain.
BTW, despite having been infected, they had been practicing the usual precautions-- until my son decided that it would be reasonably safe to fly on a ski trip, where he apparently picked up the reinfection and brought it home.
Fortunately, the reinfection, at least so far, has been a lot less severe that the first bout, and I only bring up their story in the hope that it will cause former COVID victims to continue to be careful.
The bottom line: achieving herd immunity may be more difficult than some had hoped.
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