Drifting smoke from the wildfires has lowered curtains of haze on broad swaths of Canada and the United States, pushing into southern Illinois, Indiana and Ohio, and moving into parts of West Virginia.
Early studies from China in 2020 suggested people with certain blood types—specifically blood type A—might be at greater risk for getting infected—while those with type O may be protected against infection. Some small studies confirmed the connections, while others did not, leaving public health experts agnostic about how important blood type might be as a potential risk factor for COVID-19.
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