God tells Aaron and Moses how to deal with lepers (Does he say that priests can cure lepers?)
We also so learn how to deal with unclean women. Seems unfair to separate her from everyone else. And why does a woman have to offer a sacrifice for having a active reproductive system?
Again, I'm reading these as basic health care rules. The washing of the skin and clothes and the washing of everything the sick person has come in contact with as well as the scrapping of the stones of a house seem to be a little ahead of its time as far as cleaning. Were the early Israelites close to discovering germ theory?