Jennifer Nuzzo is a health expert who has become nationally prominent during the pandemic. She is the leading epidemiologist for Johns Hopkins University’s much-cited data collection on Covid-19 testing. She is active on Twitter and quoted frequently in the media. She can explain complex ideas in clear terms, and she has often been prophetic about Covid.
Nonetheless, she took to Twitter last May to criticize herself. She had expected Texas’ ending of its mask mandate to lead to a surge in cases, and it had not: