Researchers have found that a coronavirus detected in East African bats can bind to and enter human lung cells, raising concerns about potential zoonotic spillover.
The virus, named CcCoV-KY43, was identified in heart-nosed bats (Cardioderma cor) across eastern Sudan and northern Tanzania. Though not closely related to SARS-CoV-2, it belongs to the alphacoronavirus group, which includes viruses that typically cause mild colds in humans. The discovery was made by an international team using synthetic spike proteins to test receptor binding, avoiding work with live virus.
How the virus interacts with human cells
The spike protein of CcCoV-KY43 successfully binds to a receptor found on human lung cells, the same mechanism used by SARS-CoV-2 to gain cellular entry. This binding suggests the virus has the molecular capability to infect human respiratory tissue. However, initial tests in Kenyan communities showed no evidence of prior infection in the local population.
Why scientists are monitoring but not alarmed
While the virus can theoretically infect human cells, there is currently no indication it has jumped to people or caused illness. Researchers stress that binding ability does not equate to transmissibility or pathogenicity in humans. Similar findings in the past, such as with certain bat coronaviruses detected in Southeast Asia, have not led to outbreaks without further adaptation.
What comes next in the research
The team plans to expand surveillance to determine how widespread the virus is in bat populations and whether any high-risk groups show signs of exposure. They also intend to apply their lab-based screening method to identify other animal viruses with zoonotic potential. Their goal is to improve early detection of pathogens before they establish sustained human transmission.
Can this virus cause COVID-19-like illness in humans?
No evidence suggests CcCoV-KY43 causes illness in humans; it is not related to SARS-CoV-2 and has not been found to infect people in initial testing.
Is there a risk of an outbreak from this virus?
Currently, there is no sign the virus has spilled over into humans, and experts say many factors beyond cell entry are needed for sustained transmission.
