Fewer Bat Species Harbor Hazardous viruses Than Previously Thought, New Research Reveals
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A new study challenges long-held assumptions about the role of bats in spreading zoonotic diseases, finding that the number of bat species carrying viruses with pandemic potential is considerably smaller than previously believed. Researchers from the University of Oklahoma and Yale University published their findings in Communications Biology, offering a more nuanced understanding of viral emergence and the impact of human activity.
Reframing the Risk: Not All Bats Are Equal
“Characterizing host-virus associations is critical due too the rising frequency of emerging infectious diseases originating from wildlife,” the researchers wrote. They emphasized that previous analyses often treated zoonotic risk as a simple “yes” or “no” scenario, failing to account for the varying degrees of virulence, transmissibility, and potential death burden associated with different viruses.
Machine Learning Identifies High-Risk Groups
to pinpoint the most vulnerable bat species, the research team employed advanced machine learning techniques. Their analysis encompassed data from 889 mammal species, including 202 bat species, which carried 112 different virus species belonging to 23 virus families. The viral families Togaviridae and Flaviviridae were identified as containing the viruses most likely to be found in bats. Notably, Rhinolophidae – commonly known as horseshoe bats – were found to harbor the most dangerous viruses, a finding consistent with previous studies.
Human Activity: The Primary Driver of Spillover
The study underscores the critical role of human activity in driving the emergence of zoonotic viruses. Researchers hope their findings will facilitate conversations about how human actions,rather than bats themselves,are the primary cause of viral spillover.
“We hope our analyses can aid in facilitating conversations highlighting the ways in which human activities, not bats inherently, drive zoonotic viral emergence,” the researchers stated.Specifically, the study points to human encroachment and habitat destruction as key factors increasing the risk of viral spread. thes activities lead to increased contact between species and stress bats, potentially weakening their immune systems and increasing viral shedding.
Bats in Buildings: A Potential Concern
The research also identified two bat superfamilies, Emballonuroidea and Vespertilionoidea, as potentially posing a higher risk of viral spillover to humans. Many species within these groups commonly roost in human-made structures, such as houses, increasing the likelihood of close contact. Identifying these high-risk species is crucial for targeted surveillance and conservation efforts, which can be resource-intensive.
Culling is Counterproductive
Contrary to some proposed solutions, the researchers found that culling bat colonies is not an effective strategy for preventing viral outbreaks. In fact,it can actually increase viral prevalence within bat populations and amplify the risk of spillover.
The Ecological Importance of Bats
The study concludes by emphasizing the vital ecological role bats play in maintaining healthy ecosystems. Bats contribute significantly to pollination, seed dispersion, and agricultural pest consumption. “If we lost bats, agricultural production would be negatively affected, and so would economies,” explained Caroline Cummings, a doctoral student at the University of Oklahoma and lead author of the study, in a university news release.
This research provides a crucial step towards a more informed and effective approach to preventing future pandemics, shifting the focus from blaming bats to addressing the underlying human activities that drive viral emergence.
