Bird flu, also called H5N1, has been detected in nearly 700 herds of cattle from coast to coast, and while there have been a few cases of it then spreading to people who work with those cattle or have come in contact with infected wild birds, the virus has thankfully not spread widely to humans.

To make sure that it doesn't, the U.S. Department of Agriculture has ordered dairy farmers to test their cattle for the H5N1. And it’s urging people to avoid raw milk that may contain it.

Grocery store milk is pasteurized (most large-scale pasteurization heats milk to 161 degrees F for not less than 15 seconds, followed by rapid cooling). That kills transmissible infections in raw milk, including tuberculosis and bird flu.

But a new study in the journal Science reveals that a single mutation in the virus could let it target humans.

Fortunately, the scientists also say that other genetic mutations would likely be required for the virus to be able to be transmitted between people.

Nonetheless, it's essential to avoid possible exposure to H5N1 (such as from raw milk) and for the scientific community to continue monitoring for genetic changes to the virus so another epidemic can be avoided.

In the meantime, bolster your immunity to viral infections by managing stress with exercise, meditation, and good sleep habits; staying well-hydrated; and getting a steady supply of vitamins C, A, and D from fresh fruits and vegetables, fatty fish, and 100% whole grains.