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A team of researchers, including two from the University of Wisconsin-Madison, has solved a long-running biological mystery, reporting the discovery of the first two viral relatives of rubella, also known as German Measles.

“Rubella was this lone wolf, this mystery, this virus that never had any relatives,” said Tony Goldberg, an epidemiologist at UW, who maintains a research project in Uganda’s Kibale National Park. It was at Kibale that one of the two new viral relatives was found in the aptly named cyclops leaf-nosed bat. The bat virus has been named ruhugu.

Goldberg and his former doctoral student Andrew J. Bennett teamed up with U.S. and German researchers to report the two rubella relatives in a paper published Wednesday in the journal Nature.