How the Swine Flu Virus Works
H1N1 is an entirely new virus, but it still works the way past flus have—by invading the body cell by cell. The question is whether our immune systems can respond in time—and before the virus mutates
H1N1 is an entirely new virus, but it still works the way past flus have—by invading the body cell by cell. The question is whether our immune systems can respond in time—and before the virus mutates
