Human exposure to the virus in poultry and dairy operations could increase the risk that the virus will mutate and gain the ability to spread easily in people. Vaccines that perform poorly can also increase that risk.
So far, only one change has been detected in the human cases, the CDC said on May 24.
“These data indicate viruses detected in both cows and the two human cases maintain primarily avian genetic characteristics and lack changes that would make them better adapted to infect or transmit between humans,” the agency stated.
For now, CDC officials say the best way to avoid bird flu is to stay away from infected animals, fluids, and feces.
Workers who must come into contact with animals are advised to wear protective equipment and monitor themselves for symptoms, which include fatigue.
People who do become sick can take influenza antivirals, which are more effective when received shortly after symptoms develop.
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