On Mon, 29 Mar 2021 20:17:23 +0100
Joe  wrote:

> Occam's Razor says that there is a simpler explanation than 'hygiene'.

 I'd guess cough etiquette[1] to be a major factor, along with the
huge upswing in effective hand cleansing.

[1] Just how long ago was the "coughs and sneezes spread diseases"
campaign ?

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