Israel says Pfizer vaccine efficacy in preventing infection drops to 39% against Delta variant
https://www.ynetnews.com/health_science/article/s19okqv0u
Singapore study shows Covid-19 mRNA vaccines are 69% effective against Delta variant: Ong Ye Kung
https://www.todayonline.com/singapo...are-69-effective-against-delta-variant-ong-ye