>"He fell sick six days after taking his first dose. . Read more at [straitstimes.com](http://straitstimes.com) ."
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.