Pfizer's shot left fewer than half of participants with side effects

About 80% of adults aged 65 to 85 reported mild to moderate reactions after receiving Pfizer's first vaccine compared to 55% give the second jab, which caused no redness or swelling after either dose.

Pfizer's shot left fewer than half of participants with side effects
About 80% of adults aged 65 to 85 reported mild to moderate reactions after receiving Pfizer's first vaccine compared to 55% give the second jab, which caused no redness or swelling after either dose.