A local expert says it's too soon to start talking about herd immunity. The White House says 100-million American adults are now fully vaccinated, or nearly 40% of all adults. Dr. Shelley Payne, head of the Center for Infectious Disease at UT, says we need to get to 70% to reach herd immunity, and that's going to take a while. Payne points to CDC figures that show vaccines have hit a plateau. She says there needs to be a coordinated national effort to vaccinate those who either can't or don't want to go to a clinic.
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