The U.S. Centers for Disease Control and Prevention is warning that a new strain of swine flu is raising concerns as it continues to infect people throughout the Midwest region.

CDC officials say that they do not expect an outbreak of the swine flu, adding that they do expect additional cases to occur. Officials noted that nearly 200 cases of the strain have already been identified.

“This is not a pandemic situation,” said Dr. Joseph Bresee of the Centers for Disease Control and Prevention.

Dr. Joseph Bresee, an epidemiologist in the CDC’s Influenza Division, said that there has been a predominance of cases in children and young adults and that all of the cases have been associated with close or indirect exposure to swine, often at state or county fairs. The other pig-to-human transmissions occurred in farmers or veterinarians.