2009 swine flu outbreak
The new influenza strain, a conglomeration of genetic fragments from swine, bird and human viruses, is the biggest threat of a large-scale flu pandemic.
At least 68 died and more than 1,000 became sick with flu- like symptoms in the Mexico City
region in the past month. Swine flu was confirmed in 20 of the deaths so far. Of 14 tissue samples tested . . . .
