NeoCov's potential danger to humans requires further study: WHO

In its current form, NeoCov does not infect humans but further mutations may make it potentially harmful, the researchers noted.

"In this study, we unexpectedly found that NeoCoV and its close relative, PDF-2180-CoV, can efficiently use some types of bat Angiotensin-converting enzyme 2 (ACE2) and, less favourably, human ACE2 for entry," the authors of the study noted.

ACE2 is a receptor protein on cells that provides the entry point for the coronavirus to hook into and infect a wide range of cells.

"Our study demonstrates the first case of ACE2 usage in MERS-related viruses, shedding light on a potential bio-safety threat of the human emergence of an ACE2 using "MERS-CoV-2" with both high fatality and transmission rate," they said.

The researchers further noted that infection with NeoCov could not be cross-neutralised by antibodies targeting SARS-CoV-2 or MERS-CoV.

"Considering the extensive mutations in the RBD regions of the SARS-CoV-2 variants, especially the heavily mutated Omicron variant, these viruses may hold a latent potential to infect humans through further adaptation," the authors of the study added.

A receptor-binding domain (RBD) is a key part of a virus that allows it to dock to body receptors to gain entry into cells and lead to infection.

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