So, should healthcare workers be required to have Covid-19 vaccines?

Yes.

What is the precedent?

Take tuberculosis, for example. Airborne, very contagious. I was born in a Knoxville, Tennessee tuberculosis sanatorium, because my mother coughed blood a month before she was due and got quarantined for active tuberculosis. Yes, the state could quarantine my mother. I was removed immediately at birth because tuberculosis doesn't cross the placenta. The antibodies do, but the infection doesn't. However, newborns usually catch it and die very quickly. I was lucky. My father and grandparents took care of me for 5 months. Then my mother was allowed out (after 6 months total) but was not strong enough to take care of me. So I was taken to my maternal grandparents for the next four months, and did not touch my mother until I was 9 months old.

My mother was taking 36 pills a day at home, because you have to use multiple drugs to kill tuberculosis. It develops drug resistance very very quickly.

Well, so what, you say?

Healthcare workers in the United States are routinely checked with a ppd for tuberculosis. If it is positive, you cannot work until further testing. If you have latent tuberculosis, you are treated. If you have active tuberculosis, the treatment is longer and more complicated, here: https://www.cdc.gov/tb/topic/infectioncontrol/default.htm

My cousin then said, "Well, you don't have to show the tuberculosis test to go in a restaurant!"

Well, not right NOW, because currently tuberculosis is under more or less reasonable control in the US. Remember that guy who came in to the US with active multi drug resistant tuberculosis and knowingly exposed everyone on that airplane? Great. I remember reading about that and thinking what a selfish jerk he was. And then the group of unimmunized people who went to India and all got measles. The US at that time did not bar anyone from returning, but asked them to finish a 3 week quarentine before returning to the US. One person did not do that. There was a measles outbreak in the midwest which cost the CDC (and therefore you and me because those is tax dollars) millions to trace, quarantine and clean up. So there was discussion at that time about whether the policy should be changed and we should not allow US citizens with known infectious diseases to come in on airplanes. We DON'T allow immigrants in with infectious diseases: they are tested for tuberculosis if coming from countries where it is endemic.

So, if we had a huge outbreak of tuberculosis, we WOULD have quarantines and shut downs.

I have tested a patient for tuberculosis, about two years ago. Her son had been diagnosed with active tuberculosis. We tested her with a blood test and then repeated it in three months. Negative, hooray. In residency I also saw a case of miliary tuberculosis. That is where the tuberculosis is growing so well in the lungs that it looks like little grains of rice in the lungs on imaging. Not a good thing.

My cousin: "You shouldn't have to put something in your body to work."

If you have tuberculosis, you do not get to work in healthcare, because you can kill your patients. I think that this is a good thing, to not kill our patients.