This effect may not be helpful to us. Humans can suffer very high death rates due to diseases for which we aren't a host. See the Black Death [1]. The host wa

This effect may not be helpful to us. Humans can suffer very high death rates due to diseases for which we aren't a host. See the Black Death [1]. The host was fleas, riding rodent vectors. [1] https://en.wikipedia.org/wiki/Black_Death https://en.wikipedia.org/wiki/Black_Death