Image Credentials: Image Title: Hidden Venom Divide in Australia’s Deadliest Snake Raises Urgent Questions About Antivenom Source: (gemini) Date: August 2025 Attribution: Created by AI-generated imagery (gemini), it does not depict a real-world scene.
By Staff Writer | Open Chronicle
Brisbane, August 22, 2025 — Scientists have uncovered a striking and potentially life-threatening difference in the venom of Australia’s notorious Eastern Brown Snake, one of the most dangerous snakes on Earth. According to a University of Queensland study, Eastern Brown Snake populations in the south produce venom that forms rock-solid blood clots, while their northern counterparts create fragile clots that collapse almost instantly.
This hidden venom divide raises pressing concerns about the effectiveness of current antivenoms, which are produced from pooled venoms of unspecified geographic origin.
Two Venoms, Two Deadly Pathways
Professor Bryan Fry from UQ’s School of the Environment, who led the study, explains the gravity of the discovery.
“Not all brown-snake venoms are the same, meaning that lifesaving antivenom may need an urgent upgrade,” Fry said. “Some venoms formed a rock-solid clot in blood, while others spun up a rapid but flimsy web of clots that shredded almost instantly. Both venoms can kill, but they do it in completely different ways.”
Using a technique called thromboelastography to analyze blood coagulation, the team found that Eastern Brown Snakes (Pseudonaja textilis) from southern Australia produce venom that behaves in a “taipan-like” way, forming stable clots. In contrast, venom from northern Eastern Browns and all other brown snake species generates fragile clots that disintegrate quickly.
“Our data shows the effect on blood of an Eastern Brown Snake bite in northern areas and a bite in southern Australia are chalk and cheese,” Fry noted.
Antivenom Under Scrutiny
Currently, Australia’s brown-snake antivenom is manufactured using venom pooled from snakes of unspecified origin. If that pool does not include both northern and southern Eastern Brown populations, coverage may be inconsistent and treatment outcomes could vary widely.
Clinical records also present challenges. To date, all brown-snake bite cases are grouped together, regardless of species or location. This could obscure important differences in patient outcomes between bites from the strong-clotting southern population and bites from other brown snakes.
Fry and his team plan to revisit hundreds of hospital records, categorizing cases by geography to determine whether clinical effects align with their laboratory findings. They also intend to test both human and veterinary antivenoms to assess whether geographic venom variation impacts treatment efficacy.
Toward Precision Toxicology
While current antivenoms have saved countless lives, researchers believe this new knowledge paves the way for more targeted treatment approaches. “With new information, we can move to precision toxicology, matching the right antivenom to the right snake, and ultimately, to the right patient,” Fry explained.
The team is also sequencing the venom genes of Eastern Brown Snakes, aiming to pinpoint the genetic mutations behind the north-south venom split. Early results suggest that the divergence is driven by diet: southern populations, which consume more reptiles, have evolved stronger clot-inducing venom, while northern snakes, which eat more mammals, produce venom that causes rapid but fragile clots.
A Call for Medical Adaptation
The findings highlight not only the complexity of venom evolution but also the need for adaptive medical responses. As Fry put it, “By appreciating both the evolutionary fine-tuning and the clinical outcomes of these venoms, we can better tailor our medical responses.”
The study has been published in Toxins.
Story Source:
Materials provided by the University of Queensland. Note: Content may be edited for style and length.
Journal Reference:
- Holly Morecroft, Christina N. Zdenek, Abhinandan Chowdhury, Nathan Dunstan, Chris Hay, Bryan G. Fry. X Marks the Clot: Evolutionary and Clinical Implications of Divergences in Procoagulant Australian Elapid Snake Venoms. Toxins, 2025; 17 (8): 417 DOI: 10.3390/toxins17080417
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