Unexpected six-month pattern of COVID-19 cases discovered in the U.S.

Covid-19 News

Unexpected six-month pattern of COVID-19 cases discovered in the U.S.
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COVID-19 cases in the U.S. have shown unexpected oscillating waves every six months between the southern states and the northern states and, to a lesser degree, from east to west, according to new research published today in Scientific Reports.

University of PittsburghSep 16 2024

Public health scientists from the University of Pittsburgh, University of Ottawa and University of Washington conducted the first detailed analysis to demonstrate and characterize the six-month oscillation of cases across space and time. It provides key information that could inform public health activities, such as vaccination campaigns, that aim to control the virus.

The COVID-19 winter waves are consistent with that of other respiratory viruses, but the existence of a repeated additional surge during the summer was unexpected. These waves start near the southern U.S. border in July and August, when the weather is hottest and the humidity is high – factors that usually tamp down the spread of respiratory viruses. We don't have a good explanation for why COVID-19 rates should increase in both the warmest and coolest times of the year.

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