Merck Animal Health MILDVAC-Ma5 is a vaccine to control Massachusetts-type infectious bronchitis virus (IBV). MILDVAC-Ma5 can also provide broad coverage across multiple IBV strains and protection against ciliostasis. It has minimal impact on the bird because it contains a homogenous virus, which reduces biological variation and helps ensure the vaccine will perform as expected in real-world settings. MILDVAC-Ma5 can be administered by coarse spray at 1 day of age or older or in the drinking water at 2 weeks of age or older. It also can be administered to 1-day-old chicks with Delaware-type, 072 strain (Shor-Bron-D). If needed for large birds, re-vaccination is recommended at 2 weeks of age.

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