Via El Universal, a February 25 report: Pilgrim’s reporta gripe aviar en su granja de Guanajuato. [Pilgrim's reports avian flu in its Guanajuato farm] So it's spread beyond just the Bachoco farms. Excerpt, with my translation:
A doce días de darse a conocer el nuevo brote de gripe aviar, la empresa Pilgrim's reportó el contagio en sus granjas cercanas a la zona donde se dio el brote primario, informó Enrique Sánchez, director del Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (Senasica) de la Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación (Sagarpa).
Twelve days after the announcement of the new outbreak of avian flu, the Pilgrim's corporation has reported the disease in the farms near the original outbreak, according to Enrique Sánchez, director of the National Health, Safety, and Agroalimentary Service of the Secretariat of Agriculture, Livestock, Rural Development, Fish, and Food.
"Resultó positivo en una de sus unidades reproductoras y al igual que Bachoco, informó de forma inmediata para tomar las medidas necesarias", dijo.
"A positive test result was found in one of its breeding unit, and like Bachoco, the company reported immediately to take necessary measures," he said.
En un comunicado la firma Pilgrim's Pride Corporation reportó haber detectado un incremento en la mortalidad en sus lotes de aves reproductoras localizadas en el estado de Guanajuato.
In a news release, the Pilgrim's Pride Corporation reported having detected an increase in mortality in its Guanajuato breeding sites.
"Nuestro equipo directivo está trabajando de manera estrecha con las Autoridades en esta materia, haciendo pruebas de sangre en las aves, con la finalidad de confirmar la presencia del virus H7N3; y ya se han tomado medidas preventivas", detalló.
"Our executive team is working closely with the authorities about this," it said, "making blood tests on the birds with the goal of confirming the presence of H7N3; and we are taking preventive measures."Here's the story in English at WorldPoultry.net. Wikipedia tells me that Pilgrim's is the largest chicken producer in the US and the second largest in Mexico. It's also a subsidiary of JBS, a Brazilian corporation that recently took over management of a major Canadian meat packer in Alberta after a long siege of E. coli.
