America's two leading vaccine manufacturers, and , are both hoping to push a fourth COVID-19 dose out the door sometime soon, but some experts doubt they are needed as Covid cases continue a steep fall in the U.S. and the virus poses less of a threat against Americans.Dr Anna Durbin is an international public health expert at Johns Hopkins University in Baltimore, , has been a critic of Pfizer, Moderna and the White House's insistence to rollout COVID-19 booster shots before they are needed. This week, she told that she does not believe many Americans will benefit from additional shots.'There are very few, if any, people who, in my opinion require a fourth dose,' she said.
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