Article-based Comprehension, Q&A . In fact, bats are natural reservoirs for viruses that have some of the highest fatality rates of any viruses that people acquire from wild animals – … Coronavirus outbreak raises question: Why are bat viruses so deadly? Compared to other mammals, they carry more viruses that can spread among humans. Bats have a pretty bad reputation, which is not surprising considering the number of pathogens they carry that can infect humans. March 14, 2020 Why Bat Viruses Are So Dangerous . They found that rodents host 179 viruses, 68 of which are zoonotic; bats, on the other hand, harbor 61 zoonotic viruses, with 137 viruses in total. A new study finds that bats, compared to other mammals, carry more viruses that can transmit and spread among humans. (2020, February 10). Why bats don’t get sick from the viruses they carry, but humans can May 20, 2020 3.04pm EDT. Rabies-carrying bats can be found in every U.S. state except Hawaii, and they can spread the potentially deadly virus year-round. They also carry the rabies virus, but in that case the bats are affected by the disease. Kevin Olival , vice president of research at EcoHealth Alliance, U.S.-based nonprofit, says scientists aren't completely sure why, but it may have to do with the families of viruses that some bats tend to carry. By Kai Kupferschmidt Jun. Their tolerance of viruses, which surpasses that of other mammals, is … However, bats do appear to carry more human-killing diseases than pretty much any other animal. Bats really do harbor more dangerous viruses than other species. Scientists in a 2017 paper did find that bats harbored more dangerous viruses than other species. First, bats carry a great variety of viruses — and the viruses they carry seem more likely to spread to people. 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