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Veterinaria Mexico OA ISSN: 2448-6760 Cite this as: Osuna Chavez RF, Molina Barrios RM, Hernandez Chavez JF, Robles Mascareno J, Icedo Escalante JGA, Acuna Yanes M. First report of biovar 6 in birds immunized against Gallibacterium anatis in poultry farms located in Sonora, Mexico. Veterinaria Mexico OA. 2017;4(3). doi: 10.21753/vmoa.4.3.389 . Identification of the predominant circulating biovars is important for controlling Gallibacterium anatis infections in poultry because efficient protection is based on the use of biovar-specific immunogens. Twenty-three isolates of Gallibacterium anatis were recovered from commercial laying hens with respiratory and reproductive clinical signs. Bacteria were identified as G. anatis based on morphology, biochemistry, and PCR testing. Biochemical analyses identified the isolates as biovar 6 which had not previously been reported in Sonora, Mexico. Therefore, the recent finding of biovar type 6 could explain clinical presentations of this disease in immunized commercial laying flocks in Sonora. Figure 1. PCR amplification gene, Gallibacterium anatis .

First report of biovar 6 in birds immunized against <em>Gallibacterium anatis</em> in poultry farms located in Sonora, Mexico.