While studies on the efficacy of vaccines against the delta variant are limited, one recent study indicated that the Pfizer treatment is 84% effective against the variant after two doses, but only 34% effective after a single dose.

Another study, cited by Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, suggests that the Pfizer vaccine is approximately 80% effective against preventing infection from delta, 88% effective at preventing symptomatic disease and 96% effective at preventing hospitalizations caused by the virus.

According to a recent report, Dr. Scott Gottlieb, former FDA commissioner, said that the Johnson & Johnson vaccine appears to be approximately 60% effective against the delta variant.

But you had to play it cool, had to do it your way
Had to be a fool, had to throw it all away