Omicron variant appears to be less severe than once dominant delta variant, U.K. researchers suggest
, in a well-vaccinated population not too different from the United States. The power of the study lay in the wealth of data kept by the National Health Service in Scotland — records of vaccine status, age, gender, underlying health conditions and covid-19 infection for nearly 98 percent of the Scottish population.
The Scottish scientists said recently vaccinated people appear to have some protection against symptomatic infection from omicron, but less so than against delta. A third dose or booster of an mRNA vaccine was associated with a 57 percent reduction in the odds of developing symptomatic covid. Boosters gave better protection against the delta variant — more than 80 percent.The researchers estimated the potential for reinfection 10 times more likely with omicron than with delta.
The scientists said there were not enough omicron infections and hospitalizations among those over 60 years to reach confident conclusions, but they expected the overall trend would hold.Imperial College LondonThat group, led by Neil Ferguson, reported that those infected by omicron were 15 to 20 percent less likely to go to an emergency room with severe symptoms and 40 percent less likely to be hospitalized overnight, when compared to those infected by delta.
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