Following the pattern of bird flu, horse flu etc., the term swine flu refers to a flu virus which has adapted to a specific host, in this case, pigs. However, though the term swine flu is being used to describe the new strain of flu currently transmitting directly among people, most recent research by the WHO suggests that it may not be caused by pigs. There is also no evidence to suggest that this flu is circulating in pigs, or consequently that the disease can be caught by eating pork.