On many minds: Maybe I’ve already had Covid-19

Now that we can be pretty sure the coronavirus was loose in the U.S. much earlier than anyone previously knew, quite a few Americans are recalling that nasty bug that walloped them over the winter and asking, could that have been Covid-19?

And it’s not just civilians. Doctors are thinking back to unexplained respiratory cases among their patients. Medical examiners are looking for more misattributed deaths like the ones in California that rewrote the U.S. virus timeline this week. And local politicians are demanding investigations.

Researchers now say that hidden outbreaks were seeping through cities like Chicago, New York, Seattle and Boston in January and February, as unaware residents were going about their lives with no restrictions on their movements.

Public health experts now believe that for every known coronavirus case in the U.S., there are 5 to 20 more unknown ones — people who either had no symptoms or chalked them up to some other illness, and were never tested.