New HSV-2 Strain in China Closely Matches U.S. Virus
Nikhil Prasad Fact checked by:Thailand Medical News Team Jul 18, 2026 1 hour, 50 minutes ago
Medical News:
Scientists Discover Surprising Herpes Virus Link Across Continents
Researchers in China have identified a newly isolated strain of herpes simplex virus type 2 (HSV-2) that is genetically almost identical to strains currently circulating in the United States, raising new questions about how the virus spreads around the world. The discovery could have major implications for future herpes vaccines, antiviral treatments, and disease surveillance.
Scientists have identified a new HSV-2 strain in China that is genetically almost identical to modern U.S. herpes
viruses, offering important insights for future vaccine and antiviral development
The research was conducted by scientists from the National Kunming High-level Biosafety Primate Research Center, the Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, the Yunnan Key Laboratory of Cross-Border Infectious Disease Control and Prevention and Novel Drug Development, the Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Kunming Medical University, the First Affiliated Hospital of Kunming Medical University, the Yunnan Key Laboratory of Laboratory Medicine, and the Yunnan Province Clinical Research Center for Laboratory Medicine, all based in China.
A Rare Clinical Virus Offers New Clues
HSV-2 is the main cause of genital herpes, a lifelong infection affecting hundreds of millions of people worldwide. Although antiviral drugs can reduce symptoms, they cannot eliminate the virus from the body, and there is still no approved vaccine.
The newly discovered virus, named HSV-2/KM-1, was isolated from a 63-year-old patient in Kunming, China. After confirming the virus in laboratory tests, researchers completely sequenced its genome and compared it with more than 100 HSV-2 strains collected around the world.
The results were unexpected. Instead of closely matching the only previously sequenced Chinese HSV-2 strain, KM-1 shared an astonishing 99.92 percent genetic similarity with two modern U.S. strains. The researchers found that the Chinese strain differed by only 27 amino acid changes from one American strain but showed 128 amino acid differences compared with China's reference strain.
Global Travel May Be Reshaping Viral Evolution
The findings suggest that HSV-2 may not evolve in isolated regional groups as previously believed. Instead, viruses may be moving across continents through increasing global human travel and migration.
Interestingly, the patient had no reported overseas travel within the previous year, suggesting the infection was acquired locally. This raises the possibility that similar internationally linked HSV-2 strains may already be circulating unnoticed in China because relatively few clinical isolates have been genetically analyzed.
The researchers caution that their conclusions are based on a single virus isolate, meaning additional surveillance across China and other countries will be needed before broader conclusions can be drawn.
Fast-Growing Virus Could Help Vaccine Development&
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Beyond its unusual genetic makeup, KM-1 also demonstrated biological characteristics that make it valuable for future research.
The virus multiplied rapidly in human foreskin fibroblast cells, with viral proteins appearing only 12 hours after infection. In laboratory-grown Vero cells, the virus reached exceptionally high concentrations, especially when very small amounts of virus were used to start the infection. Such efficient growth makes KM-1 an excellent candidate for laboratory studies evaluating new antiviral drugs and experimental vaccines.
Importantly, antibodies generated by an experimental HSV-2 vaccine containing the viral proteins gC, gD and gE successfully neutralized the KM-1 strain, suggesting that vaccine candidates targeting these proteins may remain effective against this newly identified virus.
Important Genetic Differences Found
This
Thailand Medical News report also highlights another significant finding. Researchers discovered numerous mutations in viral proteins responsible for controlling viral replication, disease severity and immune evasion, including ICP4, UL36 and UL52.
Several of these mutations changed the chemical properties of the proteins, potentially altering how the virus interacts with human cells or escapes immune defenses. Although further laboratory studies are needed, these genetic differences could influence future vaccine design and antiviral drug development, particularly for populations in Asia.
Conclusion
The discovery of HSV-2/KM-1 provides scientists with an important new clinical strain that better reflects viruses currently circulating in the real world than many laboratory-adapted strains. Its unexpected genetic closeness to U.S. viruses challenges long-held assumptions about regional HSV-2 evolution and emphasizes the need for broader international genomic surveillance. The isolate could become an important resource for developing more effective vaccines, evaluating new antiviral therapies and improving global herpes control strategies.
The study findings were published in the peer reviewed journal: Infection, Genetics and Evolution.
https://www.sciencedirect.com/science/article/pii/S1567134826000146
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