I found a very novel product at the NPMA convention called Kaput Combo Bait from Scimetrics. I personally know the owner. He’s a wealth of knowledge and a good, honest business man.
An UNPRECEDENTED public health tool.
Attacking Fleas with Rodent Bait
Standard rodent control kills ground squirrels only. After these rodents die, the fleas from the hosts seek other warm-blooded animals for food. These can be pets, wildlife, and humans. Now there is a solution to reduce transference of certain rodent-borne disease, such as plague from rodent to man or animals by controlling ground squirrels and the fleas they carry.