The findings add to scientists’ understanding of the vaccination’s effect on curbing Delta’s spread, but are “both more and less encouraging”, says Marm Kilpatrick, an infectious-disease researcher at the University of California, Santa Cruz. But that protective effect is relatively small, and dwindles alarmingly at three months after the receipt of the second shot. The study shows that people who become infected with the Delta variant are less likely to pass the virus to their close contacts if they have already had a COVID-19 vaccine than if they haven’t 1. The first study to look directly at how well vaccines prevent the spread of the Delta variant of SARS-CoV-2 brings good news and bad. A health worker gives a COVID-19 vaccine in Hanoi.
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