Several media outlets are reporting that the White House intends to announce next week that recipients of both the Pfizer/BioNTech and Moderna mRNA COVID-19 vaccines should receive a third dose of vaccine 8 months after their second dose in order to boost protection against the Delta (B1617.2) variant.The proposed third doses could be administered as soon as mid-September, sources told The New York Times, with nursing home residents and healthcare workers poised to get the first shots, followed by elderly Americans who were vaccinated last winter.The Food and Drug Administration (FDA) will need to authorize additional shots, and guidance for Johnson & Johnson recipients will follow after that company releases results from a second-dose