I do ducks, chickens, rabbit , then quail. Quail and rabbits are inside and hands get washed as soon as I come in whether I wear gloves or not.
one of my mentors ( a hunting buddy) taught me to work from the youngest to the oldest then reading Dr. Leland Hayes would re enforce this a number of years later
reason being is chicks would have less chance to be infected with anything I ma not sure of the science and once ya make it a habit I do not even think about doing it