President Joe Biden listens as Pfizer CEO Albert Bourla speaks at a Pfizer manufacturing site in Portage on February 21. Clinical trials showed that the Pfizer vaccine was more than 90 per cent effective at preventing the virus six months after the second dose. "It is extremely important to suppress the pool of people that can be susceptible to the virus," Bourla said during the segment, which was taped on April 1. A Northewell Health nurse inoculates a sheet metal worker with the first dose of the Pfizer vaccine. Photo / AP"It seems strong but there is some waning of that and no doubt the variants challenge ... they make these vaccines work harder.

Source: New Zealand Herald April 16, 2021 00:56 UTC