First detected in the United Kingdom, Omicron XE is a combination of the previous Omicron variants BA.1 and BA.2 and could potentially spread even more quickly than every previous variant.
Multiple sclerosis, sometimes thought of as primarily affecting White people, is also common and often more severe in Hispanic and Black people, a study assessing neighborhood-level data shows.
Although more information is needed, data are beginning to enable comparisons between the efficacy and duration of immunity from infection, vaccination, and a combination of the two.