The statement also said, "We are prepared for booster doses if and when the science demonstrates that they are needed." But that science is unclear, and there is still much to learn about the potential need for booster doses of coronavirus vaccine. Some real-world evidence of waning immunity with Pfizer's coronavirus vaccine has emerged in Israel, where the Ministry of Health issued a brief statement Monday saying an analysis had shown the coronavirus vaccine was somewhat less protective against severe disease than before, and linked this change to the spread of the Delta variant , a more transmissible and possibly more dangerous strain of coronavirus. "It would be a mistake to be giving booster doses without both some information about number one: Do they boost? For instance, organ transplant recipients might not have an adequate response to coronavirus vaccines because they take drugs to suppress their immune systems.

Source: CNN July 09, 2021 22:41 UTC