As COVID Vaccine Nears, States Set Rules: Legislative Watch

Governing: For months, public health officials have repeated the message that a vaccine is essential to achieving the herd immunity necessary for a return to pre-COVID freedoms. It’s possible that two vaccines will be available by the end of 2020. Dozens more are in development, with several expected to be approved early in 2021.

Estimating the number of people who will need to be vaccinated to achieve herd immunity is difficult, involving several factors, including the average number of people infected by each person who has COVID-19, the efficacy of the vaccine involved and how long the protection that it provides will last.

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