I am using the daily Bible reading schedule from “The Bible.net” for my daily Bible reading.

Today, I am reading and commenting on  Numbers 19-21.

I may be mistaken, but the water of purification described here seems likely to have antiseptic properties.  Further, the seven days that those who touch a dead body were required to stay in isolation would result in someone exposed to an infectious disease to become symptomatic before their time of isolation ended.  Seven days of isolation are prescribed for other forms of uncleanness which involve a risk of exposure to an infectious disease.  I always find it interesting when I notice how seemingly purely ritualistic instructions in the Bible appear to have practical application.