I've been getting mixed information about vaccinating. After my 1st hatch I went to my local feed store to ask about chicken vaccines, where I was told it's almost unheard of for byc, very expensive & only required for show, FFA & 4-H. Being relatively new to raising chickens, I took her word for it. However, after reading many articles & forums I've since learned of all of the horrible diseases that could potentially threaten my flock. I currently have 5 adult chickens & 7 2 month old chicks, I purchased the adults as adults & suspect they were all hatchery chicks but my latest hatch have not been vaccinated. Is it still possible to safely vaccinate the chicks & which vaccines are most recommended? Should I also vaccinate my adult chickens & which vaccines are necessary? Thank you in advance for your time & advice.