Schuchat said a number of factors are driving the increase. The disease is cyclical, she noted, with peaks and valleys that happen about every three to five years. Immunity to the vaccine could diminish over time. A rise in diagnoses and reporting of cases may influence the data as well.
Schuchat stopped short of blaming vaccine delayers and abstainers for the increase in cases. She said she’s aware of pockets around the country with large numbers of unvaccinated people, but added,
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