Chinese researchers have identified a new bat coronavirus, designated HKU5-CoV-2, which has the potential to infect human cells. This discovery has raised concerns about possible animal-to-human transmission, though experts advise that the risk of widespread human infection remains low.
The research, led by virologist Shi Zhengli—often referred to as “batwoman” for her extensive work on bat coronaviruses—was conducted at the Guangzhou Laboratory in collaboration with the Guangzhou Academy of Sciences, Wuhan University, and the Wuhan Institute of Virology. Their findings were published in the scientific journal Cell.
HKU5-CoV-2 belongs to the merbecovirus subgenus, which includes the virus responsible for Middle East respiratory syndrome (MERS). Notably, this new virus utilizes the angiotensin-converting enzyme 2 (ACE2) receptor to enter human cells—the same pathway employed by SARS-CoV-2, the virus that causes COVID-19. Laboratory experiments demonstrated that HKU5-CoV-2 can infect human cells with high ACE2 expression, as well as human intestinal and airway tissues cultured in vitro.
ability to bind to human ACE2 receptors, HKU5-CoV-2 exhibits a significantly lower binding affinity compared to SARS-CoV-2. This reduced efficiency suggests that the virus is less likely to spread among humans. Dr. Michael Osterholm, an infectious disease expert at the University of Minnesota, noted that existing immunity in the population to similar SARS-like viruses might further diminish the risk of a pandemic arising from this new virus.
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The discovery of HKU5-CoV-2 underscores the importance of ongoing surveillance and research into bat coronaviruses, especially given their potential to cross species barriers. While the immediate threat to public health appears minimal, scientists emphasize the need for continued monitoring to detect and mitigate any future spillover events promptly.
In response to the study, shares of COVID-19 vaccine manufacturers experienced an uptick, reflecting investor sensitivity to news about emerging pathogens. However, experts caution against alarmism, reiterating that the current data does not indicate an imminent public health crisis.
In summary, while the identification of HKU5-CoV-2 highlights the ever-present potential for zoonotic diseases, the current assessment suggests a low risk of this particular virus causing a widespread outbreak in humans. Nonetheless, the situation reinforces the necessity for vigilant scientific inquiry and public health preparedness.