The CDC, however, has begun to release data related to the former vaccine. The agency found unvaccinated patients were approximately 14 times more likely to become infected with the virus based on early real-world effectiveness data.
In the week of August 28, monkeypox incidence was 230 per 100,000 for unvaccinated individuals. Among those who received at least one dose of the Jynneos vaccine in the same period, 15 per 100,000 became infected.
Although the U.S. government has made the ACAM2000 vaccine available for use against monkeypox, it remains unclear how protective it is in the current outbreak.