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In New England and the Pacific, prevalence tended to be lower, whereas higher prevalence was seen in the South, Midwest and West.
The panel is expected to focus on the safety of high-risk Americans, including people 65 and older and anyone with a weakened immune system.
Symptoms were linked to increased odds of at least moderate interference with functioning and lower odds of full-time employment.
In a large study, there were lower odds of neonatal mortality associated with vaccination.