BENGALURU : A nurse in California tested positive for COVID-19 more than a week after receiving Pfizer Inc's vaccine, an ABC News affiliate reported on Tuesday, but a medical expert said the body needs more time to build up protection. He went to a drive-up hospital testing site and tested positive for COVID-19 the day after Christmas, the report said. Christian Ramers, an infectious disease specialist with Family Health Centers of San Diego, told the ABC News affiliate that this scenario was not unexpected. "We know from the vaccine clinical trials that it's going to take about 10 to 14 days for you to start to develop protection from the vaccine," Ramers said. "That first dose we think gives you somewhere around 50%, and you need that second dose to get up to 95%," Ramers added.

Source: Mint December 30, 2020 11:03 UTC