COVD-19 vaccine update COVID-19 vaccine update from the latest Lancet article (4 Nov 2020) As the efficacy decreases, the population that needs to be vaccinated increases. (a) For a vaccine with 100% efficacy that gives life-long protection, herd immunity required to .Read More... 05 Nov 2020 by ICPA HEALTH PRODUCTS LTD COVID-19 Leave a Comment