Where vaccination rates are low in the U.S., the reasons vary.

As the Omicron variant surges, and experts say that vaccinations strongly protect against severe illness, U.S. public health officials are closely examining ways to reach the least-vaccinated areas.,As the Omicron variant surges, and experts say that vaccinations strongly protect against severe illness, U.S. public health officials are closely examining ways to reach the least-vaccinated areas.

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