The “workers” appear to me to be a couple of Mexican guys with a Harbor Freight purchased 2500 psi pressure washer, that probably had not a clue as to the seriousness of the cleanup job they were assigned probably by the management of the apartment building.
Curious if these guys were even aware they were cleaning up Ebola vomit, and there was an iota of danger in what they were doing either for themselves, or anyone else.
I bet they were hires by the landlords. If the crew, or inhabitants, come down with this stuff, they are negligent.