Covid-19 vaccine efficacy results are not enough

“If people can get a vaccine that is quite effective in preventing Covid-19 symptoms but still carry the virus, they could still potentially spread SARS-CoV-2. This is an important issue because there will only be very limited doses of the vaccine available once it’s cleared for emergency use — and it will likely be many months after that before a sizable amount of the US population will be able to be vaccinated. That means people who have received the injections might need to maintain precautions like wearing masks and social distancing to prevent further spread of the virus before the vast majority of people have been vaccinated.”

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