No vaccine is 100% effective. However:
Fully vaccinated seniors are 94 percent less likely to be hospitalized with covid-19
CDC’s real-world findings provide reassurance about Pfizer-BioNTech, Moderna vaccine effectiveness in the highest-risk age group
Washington Post April 28, 2021
(excerpt)
The Pfizer-BioNTech and Moderna vaccines being deployed to fight the coronavirus pandemic are highly effective in preventing hospitalizations among older adults, the group most at risk for severe disease and death, according to a federal study released Wednesday.
While not surprising, the results are reassuring because they provide the first real-world evidence in the United States that both vaccines prevent severe covid-19 illness, as they did in clinical trials, the Centers for Disease Control and Prevention said.
In the study, fully vaccinated adults 65 and older were 94 percent less likely to be hospitalized with covid-19 than than unvaccinated people of the same age, according to the CDC. People who were partially vaccinated were 64 percent less likely to be hospitalized with the disease than the unvaccinated.
The risk for severe illness increases with age, and because older adults are at highest risk, the CDC prioritized them for vaccination. About 68 percent of adults 65 and older in the United States — more than 37 million people — have been fully inoculated, the data shows.
Early reports from Israel documented the real-world effectiveness of vaccination, including among older adults, but those reports looked only at those inoculated with the Pfizer-BioNTech vaccine. In the CDC analysis, both Pfizer and Moderna were represented.
The analysis is one of many by the CDC and other groups to assess the effectiveness of the coronavirus vaccines in real-life conditions. In the United Kingdom, another study released Wednesday found that a single dose of the Pfizer-BioNTech or Oxford-AstraZeneca vaccine may reduce transmission of the coronavirus within households by almost 50 percent. Researchers from Public Health England said that protection was seen around two weeks after vaccination — regardless of a person’s age or contacts.