Even as COVID-19 vaccines started rolling out, there were still concerns. A San Diego emergency room nurse received a shot of the COVID-19 vaccine. Sadly, he tested out positive for the virus a week after. It clearly shows that even if you have received the vaccine, you can still end up infected if you do not carefully stick with the safety protocols.
Stories like this will become more prevalent as millions of Americans are starting to receive the Pfizer-BioNTech and Moderna vaccines over the coming months.
Over time, many who are vaccinated will still get infected with the novel coronavirus. During the trials, the vaccines were shown to be about 95% effective – which means some vaccinated people were still infected.
Immunity does not kick in right away
It takes time for vaccines to establish immunity, and the two authorized coronavirus vaccines both require two doses, given several weeks apart, to train the body’s immune system. People can be exposed to coronavirus right before receiving the vaccine, or right after, and there is not enough time for the body to develop the proper defenses.
According to the Centers for Disease Control and Prevention, building immunity usually takes a few weeks. A person can be infected with the virus that causes COVID-19 just before or just after vaccination and still ends up sick.
The 95% efficacy number for the COVID-19 vaccines also assumes some built-in wait time. Moderna measured the efficacy of its vaccine starting 14 days after the second dose while Pfizer measured it starting seven days after the second dose.
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