[header] How to vaccinate chickens [title] Give chicks their first vaccinations at the right time. [step] Different vaccines need to be given at different times in a chicken's life. Most vaccines are given soon after the chicks have hatched. 
Always talk to a veterinarian before vaccinating if you have never vaccinated a chicken before. Common vaccinations include : [substeps] E.coli: given at one-day-old.