Did a collision of COVID-19 and HIV forge the omicron variant?
The South African scientist who detected the fast-spreading variant has been warning for months that the people mostly likely to spawn such coronavirus mutations in...
Protection offered by booster shot beats ‘natural immunity,’ study suggests
Public health officials have been struggling to persuade eligible Americans to get their COVID-19 booster shots. New research could help them make the case that...
CDC shifts pandemic goals away from reaching herd immunity
Since the earliest days of the pandemic, there has been one collective goal for bringing it to an end: achieving herd immunity. But the CDC...
COVID vaccines’ effectiveness against infections ebbs over time, but they still protect against death, study finds
As the delta variant became the dominant strain of coronavirus across the U.S., all three COVID-19 vaccines available to Americans lost some of their protective...
Among the unvaccinated, delta variant more than doubles risk of hospitalization
The delta variant of the coronavirus not only spreads 50% more readily than the alpha variant it rapidly overtook, it's also making unvaccinated people sicker,...
Why a fast-spreading coronavirus and a half-vaccinated public can be a recipe for disaster
With infections surging among the unvaccinated, hospitalizations soaring and just half the population fully inoculated, the coronavirus is not done with us yet. Here's a...