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CNN) — The number of people stung by red fire ants in Australia has increased significantly in past weeks, with 23 people requiring hospital treatment since the beginning of March ...

Over the past century, red fire ants have spread throughout much of the United States, Mexico, the Caribbean, China and Australia. Last year, they were spotted in Europe for the first time.

The number of people stung by red fire ants in Australia has increased significantly in past weeks, with 23 people requiring hospital treatment since the beginning of March, according to national ...

Red fire ants are among the world's most invasive species. - Wirestock/iStockphoto/Getty Images ...