Avian influenza H5N1 infection in humans has spread to seven U.S. states, growing from 46 cases last week to 52 cases this week.

One very easy way to lower the chances of a genetic shuffling would be for everyone, but especially farm workers, to get vaccinated against seasonal flu.

Poultry on a commercial farm in England have been infected with the bird flu virus. The U.K. government says the H5N1 virus was found in birds in St.