And we are assured that Typhus cannot be transmitted from one person to another so we need not fear brushing up against bums on the street. However, a flee that has typhus can hop off that victim onto a passing ankle on the street. Or a non infected flea can bite a bum, become infected, and go on to bite another human. What other flea borne diseases are out there waiting to become a “problem” in cities flooded with vagrants and bums? And lice? How about just feces here there and everywhere and being washed about by the rain? It is/was only a matter of time.