DES MOINES, Iowa (AP) — Anthrax has killed more than 100 animals on ranches in Colorado and Texas within the past two weeks, and experts say the risk of infection may be greater with drought covering much of the United States.

Anthrax outbreaks happen occasionally in livestock herds and wild animals in the U.S., usually west of the Mississippi River. Animals typically contract the disease by ingesting or inhaling spores that can survive in soil for decades. Once infected, livestock can die within hours.

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