Delta variant: Pfizer Covid vaccine 39% effective in Israel, prevents severe illness

'"We have to be mindful that, with time, the effectiveness of these vaccines may wane," said Dr. Isaac Bogoch, an infectious disease professor at the University of Toronto.'

https://www.cnbc.com/2021/07/23/delta-variant-pfizer-covid-vaccine-39percent-effective-in-israel-prevents-severe-illness.html

https://www.jpost.com/%20israel-pfizer-news/is-israel-or-the-uk-right-when-it-comes-to-covid-19-vaccine-effectiveness-674766

It is time for booster shots.

https://www.cnn.com/2021/08/14/health/covid-19-vaccine-boosters-explainer-fda-wellness/index.html