Merck chicken bronchitis vaccine approved for use in China

Merck

Merck

MRK

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BEIJING, May 27 (Reuters) - Merck MRK.N said its vaccine against bronchitis in chickens has been approved by the Chinese agriculture ministry for use in the world's largest chicken-rearing country, which is home to over 5 billion birds.

Any chicks that hatch today can be vaccinated from Thursday, with the live vaccine formulation suitable for chickens aged 1 day and above, the U.S. company said on Wednesday.


  • The vaccine targets infectious chicken bronchitis strain 4-91, a highly contagious chicken coronavirus first identified in Britain in the early 1990s.

  • Side effects of chicken bronchitis typically include reduced egg production and coughing, according to the US National Institutes of Health research institute.

  • Chicken bronchitis has a “high mutation rate and rapid transmission,” Zhang Guozhong, a professor at China Agricultural University, said in the statement, warning of "severe and complex" epidemic risks across flocks.


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