Virology Will the H1N1 virus trigger a pandemic similar to the 1918, 1957 and the 1968 events? Kalyan Ray cites researcher Daniel Perez, who showed that an avian flu virus requires relatively fewer mutations to spread rapidly between mammals.

With the world overcoming the initial pangs over swine flu (H1N1) outbreak, new questions have come up on the Mexican H1N1 virus