Pfizer Says Clinical Trial Shows Vaccine is Highly Effective For 6 Months

An ongoing Phase 3 clinical study shows that the Pfizer vaccine is 91% effective for at least 6 months, the company announced April 1.

Vaccine experts say it is likely effective longer than that, but this data showing high protection 6 months after both shots are administered is good news.

“The vaccine was 100% effective against severe disease as defined by the U.S. Centers for Disease Control and Prevention (CDC), and 95.3% effective against severe COVID-19 as defined by the U.S. Food and Drug Administration (FDA),” Pfizer and BioNTech said...