Study affirms threat of animal pathogens; Growing risk seen of illnesses mutating, attacking humans.(Main)

Byline: Associated Press

ST. LOUIS - Humans risk being overrun by diseases from the animal world, according to researchers who have documented 38 illnesses that have made that jump over the past 25 years.

That's not good news for the spread of bird flu, which experts fear could mutate and be transmitted easily among people.

There are 1,407 pathogens - viruses, bacteria, parasites, protozoa and fungi - that can infect humans, said Mark Woolhouse of the University of Edinburgh in Scotland. Of those, 58 percent come from animals. Scientists consider 177 of the pathogens to be "emerging" or "re-emerging." Most will never cause pandemics.

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