Seasonality
https://emedicine. medscape.com/article/227820-overview
The above chart illustrates seasonal variations in frequency of selected upper respiratory tract
infection pathogens. PIV = parainfluenza virus; RSV = respiratory syncytial virus; MPV =
metapneumovirus; Group A Strept = group A streptococcus. Note that both influenza and
Coronavirus are seasonal viruses, with the incidence highest in the winter and spring. Once
again, this illustrates why there has been a decline in incidence of COVID-19 in the Northeast in
general, and further illustrates how a naive interpretation of “oh, we started wearing masks
and things got better” is wildly inaccurate.
Next, let’s examine the cases in Italy, Brazil and Peru with a slant towards seasonal variation.
BRAZIL
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