Pet cats and mankind have been residing in harmony for quite some time but that has not always been the case. There have been times when cats have been practically wiped out in the name of God. And what took place the Black Death reigned supreme for considerably longer than it will. So we will get back to the beginnings of recorded background to the time of the pharaohs of Egypt. Here pet cats were revered as Gods and many were mummified to previous for eternity. Because the cats guarded the grain warehouses and killed the rats and mice that fed on the grain. Therefore lowering famines, which were the curse of Egypt. It had been illegal to eliminate cats in those times, like cows in India today.
If this attitude towards cats goes back generations the other can realize why historians say the Black colored Death started in China. Where there are rats no cats then the rats dominate and that could have been a precursor for the condition to get near people. Now as i get back to China you may still find rats running around however, not so many in the housing estates. There are various down by the river. Also they employ a efficient rubbish clean up system that keeps the towns very clean. Where I stay the rubbish is accumulated everyday. That would also keep carefully the rat population down. And with so many discarded cats running around the rats don't possess much of an opportunity. I've never seen this but I believe the government accumulates a lot of pet cats. There used to be colonies of stray cats living in some places however now I don't see them any more.