How does the Swine Flu jump from pigs to humans?
One particular pig had contracted an unlikely mutation of the Influenza virus. That particular strain was passed on to a single child and spread through direct or indirect contact to other countries in the world. Now that the current strain is being passed from human to human it could continue to mutate into more virulent strains of the virus, which will all be contagious to humans, but will mostly likely not be contagious to pigs any longer.
