A man who shook Barack Obama's hand in Mexico died the next day from symptoms similar to those of swine flu. The White House insisted the President's health was not in any danger, but he was said to be taking the threat of an epidemic 'very seriously'. The President's health advisers were already concerned about his visit south of the border after learning the contagious virus first struck in Mexico City on April 13 - three days before Mr Obama flew in to meet government officials. Their alarm grew after learning that Felipe Solis, an archaeologist