WICHITA, Kan. (KAKE) - Butch Mattson, a Wichita shopper, said that he's been looking into whether to keep buying milk after news broke that some of the milk supply was infected with HPAI, a strain of the bird flu.

He said that based on what he's heard, he has nothing to worry about.

"I feel our food supply is relatively safe, and it's a lot better than other places in the world that I've seen," Mattson said. "I sleep well at night and eat well too."

KDA Animal Health Commissioner Dr. Justin Smith said that's the attitude shoppers should have.

He says the pasteurization process of milk before it hits shelves has been shown to kill the virus.

"The FDA, actually, has been doing some studies to help affirm that our pasteurization process takes care of this virus," Smith said. "And the limited results of those that came out on Friday is that yes, our milk supply is safe. What you buy out of the store is completely safe."

Smith said that four dairies in the state of Kansas have reported positive tests for the bird flu.

He said that the state Department of Agriculture continues to work with it's partners to make sure the food supply is safe. 

"USDA veterinary services, the FDA, CDC, NASDAQ, the National Association of Agricultural Directors, as well as the states, have all been on continual calls and Congress' conversations to coordinate this effort," Smith said. "And to make sure that...we get the animal health but we also get the public health component of this right."

Since last week, both the state and federal agriculture departments have come out with new testing requirements for dairy cows, ensuring they be tested before moving across state lines.