Today I read that the sheriff of Los Angeles County said that his department would not enforce the renewed county requirement to wear masks in indoor public places. “Forcing the vaccinated and those who already contracted Covid-19 to wear masks indoors is not backed by science,” he wrote according to the New York Times. Apparently, the sheriff thinks that those vaccinated and those who have had Covid-19 cannot spread the SARS-CoV-2 virus since the public health mandate is to prevent its spread. But the sheriff is wrong. That is not what science says.
There is a simple thing we all know that science tells us about vaccines. They work by kicking in the immune system. Those who are health food followers and believe in fostering their immune systems should understand that vaccines similarly energize the immune system. That means vaccines work when and only after you get infected by the virus, not before.
While the virus is in your body reproducing and circulating, the antibodies of your immune system go to work to eradicate the new viruses. This takes a little time. Science tells us it takes a day or two mostly, but it can drag on a few days more. The vaccine has pre-prepared the antibodies to work faster than normally; so, in a day or three your system will be cleared by the actions of your own antibodies.
But during that time, you are carrying viruses around, growing them and spewing them around as you talk and laugh and harrumph. You may never get any symptoms, or you may get only slight symptoms before your antibodies triumph, but for a while you will be a potential carrier and spreader of the deadly disease.
Clearly, being vaccinated does not prevent you from being dangerous. You are less of a risk because your window of virulent transmission is very much smaller, but vaccinated people who pick up the disease will be infectious. So, be careful of other people, and be careful for other people.