The omicron variant, though extremely contagious, was considered less deadly than delta. New research shows that wasn't always the case.
The research has limits: The data, which is preliminary, looked only at Massachusetts, meaning the findings may not extend to other states, where demographics and Covid vaccine rates may differ. Roughly 80 percent of the Massachusetts’s population has had two doses of a vaccine,And the data alone is unable to explain why Massachusetts, among the states with the highest Covid vaccination rates, experienced a higher than expected number of deaths during the omicron wave compared to delta.
Anderson noted that calculating excess deaths attributed to delta versus omicron, both regionally and nationally, can be"tricky" because researchers have to decide"when do we end the delta wave and where do we start the omicron wave."can fluctuate by region — in New England, excess deaths occurring during the delta wave tend to be lower compared to other regions of the U.S., Anderson added.
But those same preventive tactics may not have been sufficient against the extremely contagious omicron variant, Hanage said. Hanage also said the extent to which omicron looks milder compared to prior variants may be exaggerated by the high level of population immunity in the U.S., which includes both vaccination and prior infections.in The New England Journal of Medicine in February that argued the milder symptoms seen in omicron infections is likely due to more existing immunity, rather than the virus itself.
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