{"id":359,"date":"2026-02-02T11:09:09","date_gmt":"2026-02-02T19:09:09","guid":{"rendered":"https:\/\/scienceblog.com\/sciencechina\/?p=359"},"modified":"2026-02-02T11:09:09","modified_gmt":"2026-02-02T19:09:09","slug":"bat-caves-in-cambodia-hide-clues-to-a-pig-pandemics-mysterious-origins","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/sciencechina\/2026\/02\/02\/bat-caves-in-cambodia-hide-clues-to-a-pig-pandemics-mysterious-origins\/","title":{"rendered":"Bat Caves In Cambodia Hide Clues To A Pig Pandemic’s Mysterious Origins"},"content":{"rendered":"

The Battambang bat caves draw tourists from around the world. Each evening, thousands of bats pour from the limestone cliffs in swirling clouds, a spectacle that fills the Cambodian sky. What visitors don’t see is the invisible cargo these flying mammals carry, a sprawling viral universe that researchers are only beginning to map.<\/p>\n

Between 2020 and 2024, teams from Beijing University of Chemical Technology and the Academy of Military Medical Sciences collected samples from nearly 200 bats across southern China and Cambodia. They weren’t hunting for known threats. They were filling in one of virology’s most glaring blind spots: what viruses actually circulate in the Indochina Peninsula, a region where bat populations thrive but surveillance has lagged far behind.<\/p>\n

The findings, published in hLife journal, reveal just how much we’ve been missing. From 659 tissue and swab samples spanning 16 bat species, the researchers identified 137 viral strains across 27 viral families. Forty of these represent entirely novel species, viruses science had never documented before.<\/p>\n

But one discovery stands out. In the Cambodian wrinkle-lipped free-tailed bat, Chaerephon plicatus, the team found a coronavirus that shares 90.36% of its genome with a pathogen that has devastated pig farms worldwide: porcine epidemic diarrhea virus, or PEDV. This virus first emerged in England in 1971, then spread globally, causing millions of piglet deaths. For decades, researchers have puzzled over where it came from.<\/p>\n

The new virus doesn’t just resemble PEDV\u2014it appears to be a missing link in the pathogen’s evolutionary history, carrying genetic fingerprints that point back to bats as the original source. The genome tells a story of viral cut-and-paste: parts adapted for pigs, parts adapted for bats, stitched together through recombination events that likely occurred years or decades ago.<\/p>\n

Rhinolophidae bats from China’s Yunnan and Guangxi regions harboured the richest viral diversity, with 13 viral families detected. These are horseshoe bats, the same genus that hosted SARS-related coronaviruses. The team also found MERS-like coronaviruses circulating in Chinese bat populations, a reminder that viruses with pandemic potential are constantly evolving in wildlife reservoirs.<\/p>\n

What makes the Cambodian findings particularly striking is how different they are from Chinese discoveries. The viruses detected in Battambang bats sit on distant branches of evolutionary trees, evolutionarily removed from anything previously documented. This suggests that vast regions of viral diversity remain unmapped, particularly in Southeast Asia where human-bat contact is common but viral surveillance is sparse.<\/p>\n

Deep learning models trained on coronavirus genomes revealed something unsettling about the PEDV-related virus. Its ORF1ab gene, which codes for proteins essential for viral replication, shows strong adaptation signatures for pigs. But its Spike gene, which determines which host cells a virus can infect, remains adapted for bats. It’s a chimera, carrying conflicting evolutionary histories in different parts of its genome.<\/p>\n

This genetic mismatch matters because it suggests the virus could be primed for host jumping. If mutations allow the bat-adapted Spike protein to bind to pig cells, the pig-adapted replication machinery is already in place to support infection. The researchers found five genome regions with no recombination breakpoints\u2014stable segments that have been conserved through multiple shuffling events. These regions act as scaffolding around which new combinations can form.<\/p>\n

Recombination isn’t rare in coronaviruses; it’s routine. When two different viruses infect the same cell, their genetic material can swap segments, creating hybrid offspring with new capabilities. The analysis found evidence of mosaicism in 16 of 18 coronavirus sequences examined. The Indochina Peninsula appears to be a recombination hotspot, a place where diverse viral lineages circulate in overlapping bat populations.<\/p>\n

The study also documented cross-species virus sharing. A hantavirus previously known only from one bat species turned up in another. Circoviruses once found only in sea turtles and parrots appeared in three different bat species. Rotavirus A, which infects humans, was detected in multiple bat families. These aren’t just theoretical risks. They’re ongoing natural experiments in host switching.<\/p>\n

Cambodia’s viral landscape looks fundamentally different from China’s, even though the regions are geographically close. Molossidae bats in Cambodia harboured 14 viral families, while no viruses were detected in Emballonuridae bats despite sampling. Chinese bats carried 27 viral families spread across multiple host species, with Rhinolophidae and Vespertilionidae showing the greatest diversity.<\/p>\n

These regional differences likely reflect ecological variations\u2014temperature, humidity, available prey, roosting sites\u2014that shape which bat species dominate and which viruses they carry. As climate shifts and human activity expands into previously remote areas, these patterns will change. Bats will move, viruses will follow, and opportunities for spillover will increase.<\/p>\n

Yigang Tong, who led the research, sees the findings as a call to action. “Our findings underscore critical surveillance gaps,” he says. “The unique ecology of the Indochina Peninsula drives viral diversity and recombination. We call for enhanced cross-border ‘One Health’ initiatives targeting bat-human interfaces and recombination hotspots to prevent future zoonotic outbreaks.”<\/p>\n

The number of bat viruses identified in Cambodia is roughly one-twentieth of those documented in China, not because Cambodian bats carry fewer viruses, but because we’ve barely looked. The Battambang caves, with their daily tourist crowds and close human-bat proximity, represent precisely the kind of interface where spillover events begin.<\/p>\n

Viral surveillance in bats often focuses on known threats or regions where outbreaks have already occurred. This study took a different approach, systematically cataloguing what’s circulating in understudied populations before the next pandemic emerges. The results suggest we’re missing most of the picture.<\/p>\n

Each novel virus discovered expands the known universe of viral diversity, but more importantly, it provides baseline data for recognising when something new appears. When an outbreak occurs, investigators can look backwards through surveillance records to trace origins and identify where gaps in monitoring allowed a pathogen to spread undetected.<\/p>\n

The PEDV connection matters beyond pig farming. It demonstrates that livestock pathogens can have wild origins going back decades or longer, circulating undetected until conditions allow them to jump species barriers. Understanding these deep evolutionary histories helps predict which viruses might emerge next.<\/p>\n

The deep learning models used to assess host adaptation represent a new approach to pandemic preparedness. Rather than waiting for a virus to cause disease in a new host, researchers can now screen thousands of viral genomes computationally, flagging those with genetic signatures suggesting they could adapt to humans, livestock, or other species of concern.<\/p>\n

But models are only as good as the data they’re trained on, and for much of the Indochina Peninsula, that data simply doesn’t exist yet. The viral dark matter circulating in Cambodian, Laotian, Vietnamese, and Thai bat populations remains largely uncharted. Each sampling expedition reveals how much remains hidden.<\/p>\n

The researchers collected tissue samples from multiple organs\u2014intestines, lungs, kidneys, liver\u2014because different viruses show distinct tissue preferences. Astroviruses concentrated in intestinal samples. Adenoviruses appeared mainly in certain bat genera. Herpesviruses popped up in multiple tissue types. This organ-specific distribution suggests that sampling strategies matter. A swab might miss viruses that only shed from internal tissues.<\/p>\n

Seasonal variation probably plays a role too, though this study didn’t track changes over time within the same populations. Bat behaviour shifts with seasons\u2014breeding cycles, migration patterns, hibernation\u2014and viral shedding likely follows these rhythms. A complete picture would require repeated sampling across years, capturing how viral communities wax and wane.<\/p>\n

The Indochina Peninsula sits at a biological crossroads. Species from temperate China mix with tropical Southeast Asian fauna. Mountain caves provide year-round stable environments while river valleys flood seasonally. This ecological complexity supports exceptional biodiversity, including viral diversity that reflects millions of years of co-evolution between bats and their microbial passengers.<\/p>\n

As surveillance expands, the total count of known viruses will grow exponentially. The question isn’t whether more dangerous pathogens exist (they certainly do) but whether we’ll detect them before they cause outbreaks. The gap between discovery and disaster is closing. Better to map the viral landscape during peacetime than scramble to reconstruct transmission chains after people start getting sick.<\/p>\n

Study link: https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2949928325001038<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The Battambang bat caves draw tourists from around the world. Each evening, thousands of bats pour from the limestone cliffs in swirling clouds, a spectacle that fills the Cambodian sky. What visitors don’t see is the invisible cargo these flying mammals carry, a sprawling viral universe that researchers are only beginning to map. Between 2020 … Read more<\/a><\/p>\n","protected":false},"author":1299,"featured_media":360,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false,"_links_to":"","_links_to_target":""},"categories":[4,6,7],"tags":[],"class_list":["post-359","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","category-health","category-life-nonhumans","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"\nBat Caves In Cambodia Hide Clues To A Pig Pandemic's Mysterious Origins - SciChi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/sciencechina\/2026\/02\/02\/bat-caves-in-cambodia-hide-clues-to-a-pig-pandemics-mysterious-origins\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bat Caves In Cambodia Hide Clues To A Pig Pandemic's Mysterious Origins\" \/>\n<meta property=\"og:description\" content=\"The Battambang bat caves draw tourists from around the world. Each evening, thousands of bats pour from the limestone cliffs in swirling clouds, a spectacle that fills the Cambodian sky. What visitors don’t see is the invisible cargo these flying mammals carry, a sprawling viral universe that researchers are only beginning to map. Between 2020 ... 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Each evening, thousands of bats pour from the limestone cliffs in swirling clouds, a spectacle that fills the Cambodian sky. What visitors don’t see is the invisible cargo these flying mammals carry, a sprawling viral universe that researchers are only beginning to map. Between 2020 ... 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