A live vaccine for infectious laryngotracheitis, which comprises culture cells infected with attenuated infectious laryngotracheitis virus. Also, a live combined vaccine for infectious laryngotracheitis and Marek's disease, which comprises culture cells infected with attenuated viruses off these two diseases. These vaccines can be used on day-old (newborn) chicken, by subcutaneous or intramuscular injection, to give them immunity from infection by the virus or viruses. United States Patent 4980162
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