Two Omicron subvariants — BA.4 and BA.5 — are propelling the growth of COVID-19 infections this summer as they become the dominant coronavirus strains in the U.S.
These variants now make up 52.3% of infections, with BA.5 accounting for 36.6% of new cases and BA.4 accounting for 15.7% of new cases, according to thePublic health experts have expressed concerns about the subvariants because they’re more contagious and lead to higher numbers of reinfections, even among people who already contracted Omicron previously.
In addition, overall COVID-19 cases have increased 26% in California in the last two weeks, reaching an average of more than 18,000 daily cases. Los Angeles County is reporting more than 5,000 cases per day, which is the highest case rate since early February. CDC data shows that BA.4 and BA.5 are affecting U.S. regions differently, with higher prominence in the South and Midwest than in the Northeast. Individual communities are also facing higher risks, depending on the overall level of immunity and the number of older residents and medically vulnerable people.
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