The mystery of the flu-Covid 'twindemic' that never happened

While masks and distancing largely seem to have stopped influenza in its tracks, the same measures have slowed but failed to stop the spread of Covid-19, writes Dr. Kent Sepkowitz. The unanticipated split is very difficult to explain, but one possibility is that our immune systems have a better memory than we believed. "Recently, researchers showed that infection within the previous five years by old-school mild, sniffle-causing coronavirus was associated with a dramatic reduction in need for intensive and ventilator care after Covid-19."

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