The U. S. Centers for Disease Control has revealed that the swine flu cases are on rise. Recently, 52 cases have been registered, which has taken the number to 276 cases since July 2012.

The officials were of the view that the swine flu has been spotted in 10 US states and for now, it has not been revealed that the virus has spread outside the country. Main victims of the flu are children, who have remained in contact with pigs.

This was the reason that Michael Osterholm, who is designated as a flu expert at the University of Minnesota, said that pig barns should be banned for public. He also suggested that pigs should not be allowed in exhibitions and fairs.

Nancy Cox, who is serving as the chief of Influenza Division at the CDC, was of the view pigs are not only a single factor while deciding the swine flu condition. They have to see a lot many factors and then they decide accordingly.

"When you're looking at shutting down all of this activity where there may not be a problem, you know you are trying to balance many, many things", further affirmed Cox.

Initially, it was said that flu has spread through pigs, but now three cases have been detected, which have caught infection through human to human transaction.