From the pandemic’s earliest days, scientists have counted on COVID-19 vaccines to lead us out of the international health emergency. The remarkable effectiveness of the COVID-19 vaccines made by Pfizer-BioNTech and Moderna made some scientists optimistic that the pattern might change. AdvertisementMore than half of Israel’s new cases have occurred in fully vaccinated people, a sign that vaccine-induced immunity was beginning to wane. AdvertisementBut the likelihood nevertheless appeared high that, in some people at least, vaccine-induced immunity had weakened. Crotty said he suspects the Delta variant is responsible for undermining the vaccine-induced immunity that had once seemed so promising.

Source: Los Angeles Times August 18, 2021 12:00 UTC