Singapore — In a Jul 27 Facebook post, Madam Ho Ching explained the effectiveness of the Pfizer Covid-19 vaccine in comparison to the vaccine manufactured by Sinovac, specifically in terms of antibodies both produce. An antibody is a protective protein produced by one’s immune system in response to the presence of a foreign substance. Using … Continue reading Ho Ching: 2 shots of Sinovac may be equivalent to 1 shot of Pfizer