[etiam]

Maybe this could be an explanation for the most unexpected dip in COVID-19 infection around January. Does data for rhinovirus infections get collected to such an extent that it would be possible to compare curves?

[dehrmann]

Flu cases are way down, so by proxy, I'd assume colds are also down unless a lot more people got flu shots this season.

[oliv__]

Flu case numbers are way down. I wouldn't be so sure that flu cases are down

[danaliv]

I thought the January dip was from the end of holiday travel.

[thehappypm]

Short answer is nobody knows. The winter spike began around late October so you can't say it had much to do with holidays really -- maybe it's weather, made worse by holiday travel, made worse by students being back in school.