The analysis was conducted by Dr. Sharon Alroy-Preis, head of public health services at Israel’s Health Ministry, with international collaborators. It found that full vaccination, involving two Pfizer doses, is 95.3% effective in preventing infection. Pfizer’s clinical trials suggested this rate, but doctors were unsure whether it would be so closely replicated in the real world. It is 97% effective in preventing symptomatic illness and 91.5% in protecting against asymptomatic infection. The researchers found that vaccines are 97.2% effective against COVID-19-related hospitalization. They stressed that vaccine benefits are felt across all ages, writing: “In all age groups, as vaccine coverage increased, the incidence of SARS-CoV-2 outcomes declined.”