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As the world grapples with the ongoing COVID-19 pandemic, a new study suggests that antibodies -- the proteins produced by the immune system that can grant protection against reinfection -- may fade in as little as two months after infection in certain people who have recovered from the virus. The study was conducted in China and published in Nature Medicine. (Nunez, 6/24)

An influential foundation focused on preparation and response to epidemics that is backing nine potential coronavirus vaccines has identified manufacturers with capacity to produce four billion doses a year, the group’s top manufacturing expert told Reuters. (Steenhuysen, 6/25)

The flu vaccine did a disappointing job last winter in the U.S., and officials worry that might be a bad sign for the fall. Flu vaccines had been about 60% effective against the type of flu that caused the most lab-confirmed illnesses last winter, but last season’s vaccine was only about half that good, according to study results reported Wednesday. (Stobbe, 6/24)

Scientists in Britain announced a major breakthrough in the battle against the coronavirus last week, reporting they had found the first drug to reduce deaths among critically ill Covid-19 patients. The results were first made public in a sparsely detailed news release. Now the full study, neither peer reviewed nor published yet, has been posted online, and it holds a surprise. (Rabin, 6/24)