God did not create the ritual of the red heifer, described in Numbers 19, to prevent the spread of disease but to make sure we don’t treat the death of a fellow human being casually. That's regardless of whether their death was recent or many years ago. Death is our enemy. Death is not natural. Death is not our friend. The symbol of the red heifer points to the Messiah, and we can learn how much Yeshua did for us through that symbol.