Some say spikes and plunges is mainly due to trends in human activity, others say the phenomenon is seasonal
A street lined with bars and restaurants is shown in Hiroshima, Hiroshima Prefecture, Japan, in this August 29, 2021 file photo. Picture: BLOOMBERG/SOICHIRO KORIYAMAA
Kyoto University’s Hiroshi Nishiura is among those who believe the summer spike in cases and subsequent plunge were mainly due to trends in human activity. Recent record cases in South Korea and Singapore may be connected to some midyear holidays, and a convergence of Asian and Western holidays at the end of the year could lead to a “nightmare”, he said.
A theory gaining ground is that Covid-19 and its variants tend to move in two-month cycles, though Tetro said the cycle is “more a factor of human nature than mother nature”.
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