A study of highly vaccinated health workers found that the more contagious delta variant, combined with the masking mandate end, was associated with increased breakthrough cases, paralleling exponential rise of COVID-19 infections in the San Diego community.
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/09/210902101114.htm
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/09/210902101114.htm
With time and without masks, COVID-19 vaccines wane in protection, study finds
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September 02, 2021
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