Already, states are struggling to fend off the Delta variant, a strain believed to be significantly more transmissible than others. Fauci told NBC's Meet the Press he worries the event could cause a rapid surge in cases. But public health officials are watching vaccine protection closely, Fauci told CNN's Fareed Zakaria, including how protection may wane over time. Pfizer has said that protection of its Covid-19 vaccine appears to drop to 84% after six months. Moderna said last week that its Covid-19 vaccine showed 93% efficacy against symptomatic disease through six months, CNN has previously reported.

Source: CNN August 09, 2021 06:00 UTC