While the H5N1 bird flu keep spreading, there has been for the first time ever a reported H5N9 outbreak in the United States. This occurred on a duck farm in California

According to the Centers for Disease Control and Prevention, bird flu outbreaks have impacted poultry in 51 states, while the virus has been detected in dairy cows across 16 states.

Both H5N9 and H5N1 were detected at the duck farm in Merced County, according to tests conducted by the US Department of Agriculture (USDA) National Veterinary Services Laboratory. The event began on November 23, with clinical signs that included increased deaths in the ducks.

The H5N9 strain of avian influenza is much more rare than the H5N1 which has been responsible for most of the reported human cases and the first human death.

A new strain of H5N9 bird flu was detected at a commercial duck operation in California's Merced County. All the ducks were euthanized.

Learn about the new H5N9 bird flu strain in the US, its impact on food safety and prices, plus expert advice on protecting yourself from avian influenza.

Rose Acre Farms, the nation's second largest egg producer, said yesterday that tests have confirmed avian flu at its facility in Seymour, Indiana, which could further stretch the supply of eggs as commercial farms in several states continue to battle the spread of the H5N1 virus.

Minnesota and Iowa were added to the National Milk Testing Strategy on Jan. 8. There are now 36 states involved in the testing for the avian influenza virus.

Bird flu is now believed to be widespread in Massachusetts and is likely present even in places where there has not been a confirmed positive, state environmental and health officials said Wednesday.

While U.S. residents have gotten used to high prices at the grocery store, the cost of eggs is expected to rise even further this year.

Bird flu, or Avian influenza, is a virus that is spread from infected cows, birds and other animals to people.