New avian flu cases hit New York zoos killing at least 15 birds

The spread of bird fluto New York City zoos underscores the ongoing challenge of containing the outbreak (file photo) - (AP)

Bird flu has struck two New York City zoos, claiming the lives of at least three ducks and potentially up to 15 birds, according to the Wildlife Conservation Society, which manages both facilities.

Three ducks at the Queens Zoo succumbed to the virus, while tests are underway to confirm the cause of death for three ducks and nine wild birds at the Bronx Zoo.