Health authorities are now urged to move quickly to control the spread of the bird flu disease. More than two million chickens in the central state of Guanajuato had been destroyed by the end of February. About 1.2 million egg-laying chickens were slaughtered, while another 900,000 meat chickens were also killed. Officials were particularly worried about keeping the disease from spreading to the nearby state of Jalisco, Mexico’s top egg-producing state. The only good news is that this form of bird flu is the H7N3 virus, which can’t infect humans. It can also be prevented or controlled in poultry by a vaccination. Vaccines are being used effectively to create a circle around the zone of infection to prevent the disease from spreading.  ubAlert