Coronavirus reinfections: three questions scientists are asking – Nature.com
Electron microscope image of SARS-CoV-2 coronavirus particles (yellow) on a cell (red).Credit: NIAID/NIH/SPL
When news broke last week that a man living in Hong Kong had been infected with the coronavirus again, months after recovering from a previous bout of COVID-19, immunologist Akiko Iwasaki had an unusual reaction. “I was really kind of happy,” she says. “It’s a nice textbook example of how the immune response should work.”
For Iwasaki, who has been studying immune responses to the SARS-CoV-2 virus at Yale University in New Haven, Connecticut, the case was encouraging because the second infection did not cause symptoms. This, she says, suggested that the man’s immune system might have remembered its previous encounter with the virus and roared...