“Protecting these workers is also a larger safety issue. In previous epidemics, unprotected support staff have emerged as hidden “super-spreaders” as they traverse hospital floors serving lunch, cleaning linens, or taking X-rays. During the West African Ebola epidemic of 2014-’15, for example, support staff were up to 32 times more likely to become infected than the general population, according to the World Health Organization — and 48 percent more likely to become infected than doctors. And without these workers, the hospital’s delicate ecosystem would collapse.”
https://www.vox.com/identities/2020/4/14/21218956/hospital-workers-emt-masks-coronavirus-covid-19