News -Bird Flu Experts Warn Against Bad Vaccines

As China prepares to inoculate billions of birds against avian influenza, international animal health specialists are warning that improper vaccination of chickens and ducks in East Asia may be helping to spread the virus, increasing the risk of a human outbreak.

Three of the countries hardest hit by the lethal disease -- China, Vietnam and Indonesia -- are focusing on immunizing livestock, but health officials express concern that the use of fake or substandard vaccines could leave birds unprotected or, even worse, infect healthy ones.

Bird Flu Experts Warn Against Bad Vaccines