Herd immunity occurs when at least 60 percent of a population has been infected with a disease.
Coronavirus In-Depth with Dr. Ali Hassoun
WAAY ABC Huntsville, AL
Coronavirus In-Depth with Dr. Ali Hassoun
LA County 'Still Far Away From Herd Immunity,' New Antibody Numbers Show
Credit: KCAL 9 CBS LA
Duration: 01:51s
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