Chicks from large hatcheries can be vaccinated for a few cents each.
But there are other health considerations and probles that can that may prove detremental to the health of your flock and their egg or meat production. It is good to have medicationn on had to treat lice or an outbreak of coccidia. Chickens are generally healthy and week or unhealthy birs should be culled early.
Coccidia are single celled organisms that infect the intestine. They are microscopic parasites detectable on routine fecal tests in the same way that worms are, but coccidia are not worms and are not susceptible to deworming medications. They are also not visible to the naked eye. Coccidia infection causes a watery diarrhea that is sometimes bloody and can be a life-threatening problem to an especially young or small pet.