I don't know whether there have already been cases of Covid-19 associated with employment at Social Security. If not, there may be before this is over. The Department of Labor has issued some guidelines for federal workers compensation cases alleging Covid-19 as an occupational disease.
By the way, I once had a client who got workers compensation benefits for a really bad case of tuberculosis that was affecting parts of his body well beyond his lungs. There was no dispute about it being a compensable occupational disease. He had been a monkey handler working for an enterprise doing medical research. It turns out that tuberculosis is endemic among monkeys used in research and that getting tuberculosis is a well known risk of handling those monkeys. The things you learn in this line of work.