Only one rubivirus, which causes rubella, had been identified until recently, when scientists isolated a species that infects bats in Uganda and another that infected and killed a donkey, a kangaroo and a capybara at a German zoo and was found in field mice nearby. The scientists don't believe either of the newly discovered viruses can infect humans, but they do believe more rubiviruses exist, and some could pose a risk to humans.
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