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Getty Images)Spears appeared to address some of her critics in a post in early February, however, writing that she isn't perfect and isn't trying to be. raleigh road bike Rochelle Walensky, the head of the CDC, did not say when the new guidelines would be released but said the CDC is "looking forward to releasing it soon. raleigh road bike Researchers had said the vaccine was 76% effective after the first dose, and it maintained this protection from 22 days to 90 days after the first dose. raleigh road bike These strains have caused widespread concern because they include mutations along the virus’s surface spike protein, which it uses to infect cells. raleigh road bike