It seems unfair to me to pick on them. All allied health professionals are expected to work whether they are sick or not. It is just the result of the prevailing Judeo/Christian work ethic. Catholics seem to be the worst as personal sacrifice is expected by their beliefs, science be damned.
For example, one of the first things that got discarded was our previously secular hospital's very sane policy of forgiving a sick call by working an extra shift after being placed under the management of a Catholic institution. Apparently to their mind, if you can walk you can work.
In the meantime hospital acquired infections continue to be on the rise, and in many cases more deadly.