The National Health, Food Safety and Quality Service of Mexico, Senasica, reported that in Guanajuato, 66 farms and 33 backyard farms where poultry farming is practiced were inspected, with a population of 7,048,933 birds. As of February 28, 6,466 samples have been analyzed and 23 production units and a backyard flocks have been identified as positive in the municipalities of Dolores Hidalgo, Santa Cruz de Juventino Rosas, San Miguel de Allende, San Luis de la Paz, Leon, San Felipe and Celaya. In Jalisco, the 16 affected farms remain unchanged.

Regarding sacrifice, 2,025,449 broilers have been culled in Jalisco and 1,241,265 hens have been culled in Guanajuato. Furthermore, in the quarantine area of over 19,000 km2, covering the states of Guanajuato and the boundaries of Jalisco and Aguascalientes, health surveillance and counter-epidemic measures continue. There are 13 checkpoints in the sanitary cordon to prevent mobilization without official control of live birds, their products and byproducts, and poultry manure.

Senasica authorized vaccinating birds in nine federal entities for the prevention of the AH7N3 avian influenza virus. The priority is to vaccinate birds with long lifespans, such as parent stock, breeders, as well as laying hens.

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"In the states of San Luis Potosi, Mexico, Hidalgo, Tlaxcala, Michoacán and Morelos, breeding birds will initially be vaccinated; in Coahuila parent stock and breeders, while in Puebla and Querétaro, breeders and commercial layers will be immunized," according to Senasica officials. The intention is to apply about 210 million monthly vaccinations.

The National Veterinary Biological Production Agency of Mexico, Pronabive, is currently manufacturing all doses of vaccine to immunize birds.