HKUMed Researchers Identified Omicron Variant Behaviors
A study found that different SARS-CoV-2 sublineages favor either respiratory or intestinal tissues for infection.
Updated on Oct. 6, 2026 in Life Sciences
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Researchers at HKUMed have discovered that various SARS-CoV-2 Omicron sublineages utilize distinct biological strategies to infect human tissues. The study reveals that variants like XBB.1.5 favor respiratory systems, while JN.1 targets intestinal cells.
Why it matters
Understanding these specific tissue-targeting behaviors helps explain differences in transmission and disease severity across evolving variants. This research clarifies whether these clinical differences arise from viral evolution rather than population-level immunity.
The study utilized human bronchial tissues, lung tissues, airway organoids, and proximal intestinal enteroids to compare viral replication. Experiments confirmed that while EG.5.1 uses two entry pathways, JN.1 triggers low inflammation in gut cells.
The players
HKUMed
This is the faculty of medicine at the University of Hong Kong that conducted the viral evolution research.
Nature Communications
This is a peer-reviewed, open-access scientific journal that publishes high-quality research from all areas of the natural sciences.
The details
The findings suggest that variants such as JN.1 may possess the capability to spread via faecal contamination due to their efficacy in intestinal environments. In contrast, XBB.1.5 and EG.5.1 demonstrated high efficiency in replicating within respiratory tissues, highlighting a divergence in viral infection strategies.
Timeline
The research findings were published in Nature Communications on October 6, 2026.
The Big Picture
This research follows the trajectory of the HKUMed respiratory and intestinal organoid infection study to map viral evolution. By identifying these tissue-specific strategies, the findings shift the scientific focus from generalized viral spread to targeted organ-based infection dynamics.
These findings provide a foundation for public health agencies to refine monitoring strategies for emerging viral strains. As researchers identify new transmission routes, such as potential faecal spread for specific variants, sanitation and clinical guidelines may eventually be updated.
The takeaway
The study underscores that not all COVID-19 variants behave identically within the human body, with some favoring gut infection over respiratory impact. Continued monitoring of these evolutionary traits remains essential for preparing for the clinical demands of future outbreaks.
Further reading
For more on the evolution of viral pathogens, explore the latest findings in Life Sciences.
Source note: This article includes information reported by The HKU Lead.
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