This summer, the epidemic remained under control for a long time despite the gradual lifting of containment.
We had certainly internalized a lot of barrier gestures, but this is probably not the only parameter: the climate very probably played a role.
Because if all respiratory infections are seasonal, it is no coincidence.
Because we live more outdoors and windows open in summer, because viruses don't like UV rays, our respiratory mucous membranes are less fragile and our immune system may be less weakened, respiratory viruses circulate more in winter.
And the Covid has not escaped the rule.
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But can we go further than this rather crude observation of a winter-summer balance?
A French study published in
BMJ Open
shows that more subtle variations in climate from one region to another also influence the circulation of the virus.
The three researchers from the Valenciennes Hospital Center indicate that the
Météo-France
“climatic severity index”
,
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