In the absence of OSHA regulations that detail specific covid-19 safety requirements that employers MUST follow you run the risk that the employer may fire you if you don't come and there might be no recourse for you in that event other than applying for unemployment compensation. Any illness or injury that you get at work should be covered by worker's comp. It doesn't matter whether doctor, nurse, or tech worker. The difficulty may be proving that you got it at work. Also, if your symptoms (as is the case with most people who get it) are fairly mild you may find that there isn't anything to get out of worker's comp for it.