Scientists Uncover How Young Bats Drive New Virus Emergence: A Key to Predicting Future Pandemics

New research from the University of Sydney, published on July 22, 2025, sheds light on the origins of coronaviruses in bat populations, identifying young bats as crucial incubators for viral evolution. The study emphasizes that these "teen" bats are hotbeds for infections and co-infections, which can lead to the generation of novel viral strains.

Researchers meticulously analyzed over 2,500 faecal samples collected from black flying foxes and grey-headed flying foxes across Australia's eastern seaboard over a three-year period. Their findings revealed that coronaviruses were most prevalent in young bats during the months of March to July, a critical period when these bats are weaning and nearing maturity. A significant discovery was the high incidence of co-infection among juvenile and subadult bats, creating an environment ripe for the emergence of new viral strains.

The study identified six nobecoviruses, a subclass of coronaviruses not known to infect humans, including three previously unknown strains. These viruses are evolutionary relatives of sarbecoviruses (SARS-like viruses), which have a higher propensity to spill over into other species. Therefore, studying nobecoviruses provides valuable insights into the evolution of more dangerous coronaviruses.

Led by Dr. Alison Peel, the research offers a promising model for predicting the emergence of riskier coronaviruses before they pose a threat to human health. This predictive capability is particularly enhanced by focusing on co-infections in young bats during specific periods. The susceptibility of young bats to infection and co-infection could be attributed to their developing immune systems or the stress associated with finding a mate.

Furthermore, scientists are investigating environmental factors such as habitat loss and food shortages, which can compromise bat immunity, as potential contributors to this phenomenon. This comprehensive study, initiated during the COVID-19 pandemic, establishes a robust foundation for ongoing research into the intricate relationship between environmental stress and the emergence of coronaviruses.

For further details, refer to the original article on ScienceDaily.