Seems like the new vaccines harvested from bovine blood had an unexpected effect, instead of preventing the flu they mutated it into something "different", more radical yet more benign.

Though this might be a bit inconvenient at first think of the benefits, instead of fever, stuffed nose, uncontrolled coughing and sickness for 2 weeks you are turned into a cow for 2 weeks with the only side effects being urge to graze and sudden mooing.

Grocers and diary product manufacturers already look forward to the next flu season