Soligenix Inc. (NASDAQ: SNGX) Advances Ricin Vaccine amid Toxin Threat

• A recent report from India is a stark reminder of ricin’s accessibility and the pressing need for effective countermeasures.
• Ricin is a potent toxin capable of causing death within days of exposure because it stops protein synthesis inside cells, leading to organ failure.
• Soligenix has demonstrated meaningful preclinical efficacy for its ricin vaccine candidate.

A recent “Times of India” report spotlighted the danger posed by ricin, a highly toxic plant-derived compound with no known antidote and a history of attempted misuse by extremist actors. Soligenix (NASDAQ: SNGX), a biopharmaceutical company focused on biodefense solutions, is developing a vaccine candidate known as RiVax(R) to protect against ricin exposure, positioning the company’s work at the center of biodefense preparedness as public awareness of ricin’s lethality grows.

In a counter-terrorism operation in India, authorities recently foiled a ricin plot, underscoring how easily accessible castor beans can be transformed into the deadly toxin using common tools such as a coffee grinder. The report is a stark reminder of ricin’s accessibility and the pressing need for effective countermeasures. Ricin is derived from the castor oil plant (Ricinus communis) and has been used in previous plots, including a 2018 incident in Germany where a couple manufactured ricin from castor seeds at home, illustrating that ricin’s danger extends beyond laboratory settings and into real-world security concerns.

Ricin is a potent toxin capable of causing death within days of exposure because it stops protein synthesis inside cells, leading to organ failure. The U.S. Centers for Disease Control and Prevention notes that there is currently no cure for ricin poisoning, and treatment is limited to supportive care such as respiratory support and fluids to manage symptoms. Ricin’s lethality is well documented; inhalation, ingestion or injection can all trigger severe systemic effects, and even small exposures are dangerous.

Because no targeted treatment exists, the public health and biodefense communities classify ricin as a serious biological threat. The toxin’s stability, ease of manufacture and high toxicity make it of concern to national security agencies. CDC and similar authorities designate ricin a level B biothreat with potential uses in bioterrorism. The “Times” article reinforces that these risks are not merely theoretical; law enforcement around the world continues to intercept ricin-related threats, highlighting the real-world urgency of effective countermeasures.

Soligenix has demonstrated meaningful preclinical efficacy for RiVax in animal models. Data show that the vaccine has provided up to 100% protection in mice and nonhuman primates (“NHPs”) exposed to lethal doses of ricin toxin delivered systemically or by aerosol, a route considered most dangerous for human exposure. Thermostabilization of RiVax using Soligenix’s ThermoVax(R) technology enables the vaccine to withstand elevated temperatures, a key attribute for biodefense stockpiles that may be stored outside stringent cold-chain environments. The vaccine also has shown extended protection, with vaccinated animals surviving lethal challenge long after immunization.

Further supporting its development, RiVax has earned regulatory recognitions. The U.S. Food and Drug Administration (“FDA”) has granted Fast Track designation to the vaccine, a status intended to expedite the development and review of medical countermeasures addressing serious conditions. Additionally, RiVax has received Orphan Drug designation in both the United States and Europe, reflecting its potential importance as a medical countermeasure for a rare but high-impact threat.

In addition to its ricin vaccine work, Soligenix’s broader public health solutions business segment includes other high-priority biologics and vaccine candidates targeting emerging pathogens. The company leverages ThermoVax technology to enhance the stability of multiple vaccine formats, addressing the logistical challenges associated with cold-chain storage that hamper rapid response and stockpile management.

The threat of ricin plots arising from seemingly mundane materials highlights the gap in available countermeasures for such biological toxins. The absence of an antidote and the extreme toxicity inherent to ricin underscore the need for preparedness solutions beyond traditional therapeutic approaches. In this context, a proven vaccine capable of preventing systemic effects from ricin exposure represents a significant public health and biodefense advantage.

RiVax’s durability, evidenced by thermostability and strong protective efficacy in animal models, could allow for strategic stockpiling in national stockpiles and rapid deployment to first responders, military personnel and vulnerable civilian populations should a ricin incident occur. Continued development and regulatory progression of the vaccine may also inform broader strategies for biodefense and emergency readiness in a world where accessible biological threats continue to challenge health security systems.

For more information, visit www.Soligenix.com.

NOTE TO INVESTORS: The latest news and updates relating to SNGX are available in the company’s newsroom at https://ibn.fm/SNGX

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