As heat and humidity settles in for summer, the spread of swine flu in the United States is expected to slow. Scientists aren't sure why there are few cases of influenza during the summer in temperate climates. But the phenomenon is good news for the U.S. and bad news for countries in the Southern Hemisphere that are about to head into flu season with this new H1N1 strain. How will swine flu act in the fall? Scientists seek answers
Comments