You do know the Japanese air dropped fleas on China that were infected with the bubonic plague? You read history right?
See, milk has a history in our common collective and a Federal bureau owns it now but there was a time when milk killed, just like fleas.
Today do we kill fleas to prevent disease or more for common comfort? I guess it depends on what books you read? My dogs never have fleas.
And why, pray tell, did milk kill?