AP Photo/Gregory Bull
Health organizations worldwide are struggling to contain a swine flu outbreak that has killed at least 149 people in Mexico and sickened many more throughout the world, including in the United States, Europe and New Zealand. U.S. cases have now been reported across the country, with victims in California, Kansas, New York, Ohio and Texas.
Flu was first found among pigs in 1930. Over subsequent decades, health experts have identified influenza viruses in several other species as well. But which animals can pass such viruses on to people? You might be surprised by our top 10 list.
Tags: Animals, Flu, Health and Illness, Pandemic, Swine Flu
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