1,000 Doses. Comes with diluent. Recommended for intraocular, drinking water, or coarse spray vaccination of healthy chickens as an aid in the prevention of infectious laryngotracheitis. For birds 4 weeks of age but can be vaccinated as early as 10 days of age. Intended for healthy birds but should an outbreak occur, immediately institute a program of vaccination of birds fresh from the infected and work towards the diseased birds.  Do not vaccinate within 21 days prior to slaughter.