As Mpox Cases Spread Around the World, Tonix Pharmaceuticals’ Single-Dose Vaccine TNX-801 Has Potential to Slow the Spread
Tonix Pharmaceuticals (NASDAQ:TNXP) is developing TNX-801, a single-dose vaccine candidate for mpox, as global cases of the new Clade I strain continue to spread. The current outbreak has caused over 45,000 cases and 1,400 deaths since 2022, with a 3% mortality rate primarily in African countries.
Unlike the 2022 Clade II outbreak that mainly affected gay men, the new Clade I variant spreads within families and particularly affects children, who are more susceptible to severe disease. TNX-801, based on synthesized horsepox, has shown promising results in animal studies, providing single-dose protection against Clade I mpox with better tolerability than traditional vaccinia vaccines.
Current vaccines have limitations: Jynneos requires two doses and is only 66% effective with full dosing, while ACAM2000 has significant side effects. TNX-801 aligns with WHO requirements for an ideal mpox vaccine, offering potential single-dose protection, conventional manufacturing processes, and the ability to limit forward transmission.
Tonix Pharmaceuticals (NASDAQ:TNXP) sta sviluppando TNX-801, un candidato vaccinale monodose per mpox, mentre i casi globali del nuovo ceppo Clade I continuano a diffondersi. L'attuale epidemia ha causato oltre 45.000 casi e 1.400 decessi dal 2022, con un tasso di mortalità del 3% principalmente nei paesi africani.
Contrariamente all'epidemia del Clade II del 2022 che ha colpito principalmente uomini gay, il nuovo ceppo Clade I si diffonde all'interno delle famiglie e colpisce particolarmente i bambini, che sono più suscettibili a malattie gravi. TNX-801, basato su horsepox sintetizzato, ha mostrato risultati promettenti negli studi sugli animali, offrendo protezione monodose contro il mpox del Clade I con una tollerabilità migliore rispetto ai vaccini vaccinia tradizionali.
I vaccini attuali presentano limitazioni: Jynneos richiede due dosi ed è efficace solo al 66% con dosaggio completo, mentre ACAM2000 ha effetti collaterali significativi. TNX-801 è in linea con i requisiti dell'OMS per un vaccino ideale contro mpox, offrendo potenziale protezione monodose, processi di produzione convenzionali e la capacità di limitare la trasmissione futura.
Tonix Pharmaceuticals (NASDAQ:TNXP) está desarrollando TNX-801, un candidato a vacuna de dosis única para mpox, mientras los casos globales de la nueva cepa Clade I continúan propagándose. El brote actual ha causado más de 45,000 casos y 1,400 muertes desde 2022, con una tasa de mortalidad del 3% principalmente en países africanos.
A diferencia del brote del Clade II de 2022 que afectó principalmente a hombres homosexuales, la nueva variante Clade I se propaga dentro de las familias y afecta particularmente a los niños, que son más susceptibles a enfermedades graves. TNX-801, basado en horsepox sintetizado, ha mostrado resultados prometedores en estudios con animales, proporcionando protección de dosis única contra el mpox del Clade I con una mejor tolerancia que las vacunas vaccinia tradicionales.
Las vacunas actuales tienen limitaciones: Jynneos requiere dos dosis y es solo 66% efectiva con la dosificación completa, mientras que ACAM2000 tiene efectos secundarios significativos. TNX-801 se alinea con los requisitos de la OMS para una vacuna ideal contra mpox, ofreciendo potencial de protección de dosis única, procesos de fabricación convencionales y la capacidad de limitar la transmisión futura.
톤익스 제약 (NASDAQ:TNXP)은 mpox에 대한 단일 복용량 백신 후보인 TNX-801을 개발하고 있으며, 새로운 Clade I 변종의 전 세계 사례가 계속 확산되고 있습니다. 현재의 발병으로 인해 2022년 이후로 45,000건 이상의 사례와 1,400명의 사망자가 발생했으며, 사망률은 주로 아프리카 국가에서 3%입니다.
2022년 Clade II 발병이 주로 동성애 남성에게 영향을 미쳤던 것과 달리, 새로운 Clade I 변종은 가족 내에서 전파되며, 특히 심각한 질병에 더 취약한 어린이에게 영향을 미칩니다. TNX-801은 합성된 호스폭스를 기반으로 하며, 동물 연구에서 유망한 결과를 보여주었고, 전통적인 백신보다 Clade I mpox에 대한 단일 복용량 보호를 제공합니다.
현재 백신은 제한 사항이 있습니다: Jynneos는 두 번의 복용량이 필요하며, 전체 복용 시 66%만 효과적이고, ACAM2000은 상당한 부작용이 있습니다. TNX-801은 mpox에 대한 이상적인 백신을 위한 WHO 요구 사항에 부합하며, 단일 복용량 보호, 전통적인 제조 과정 및 향후 전파 제한 능력을 제공합니다.
Tonix Pharmaceuticals (NASDAQ:TNXP) développe TNX-801, un candidat vaccin à dose unique contre mpox, alors que les cas mondiaux du nouveau variant Clade I continuent de se propager. L'épidémie actuelle a causé plus de 45 000 cas et 1 400 décès depuis 2022, avec un taux de mortalité de 3 % principalement dans les pays africains.
Contrairement à l'épidémie de Clade II de 2022 qui a principalement touché les hommes homosexuels, le nouveau variant Clade I se propage au sein des familles et affecte particulièrement les enfants, qui sont plus susceptibles de développer des maladies graves. TNX-801, basé sur du horsepox synthétisé, a montré des résultats prometteurs dans des études animales, offrant une protection à dose unique contre le mpox du Clade I avec une meilleure tolérance que les vaccins vaccinia traditionnels.
Les vaccins actuels présentent des limitations : Jynneos nécessite deux doses et n'est efficace qu'à 66 % avec une posologie complète, tandis que ACAM2000 a des effets secondaires significatifs. TNX-801 est conforme aux exigences de l'OMS pour un vaccin idéal contre mpox, offrant une protection potentielle à dose unique, des processus de fabrication conventionnels et la capacité de limiter la transmission future.
Tonix Pharmaceuticals (NASDAQ:TNXP) entwickelt TNX-801, einen Impfstoffkandidaten in Einzeldosisform gegen mpox, während die globalen Fälle des neuen Clade I-Stammes weiterhin zunehmen. Der aktuelle Ausbruch hat seit 2022 über 45.000 Fälle und 1.400 Todesfälle verursacht, mit einer Sterblichkeitsrate von 3%, die hauptsächlich in afrikanischen Ländern auftritt.
Im Gegensatz zum Ausbruch des Clade II im Jahr 2022, der hauptsächlich homosexuelle Männer betraf, breitet sich die neue Clade I-Variante innerhalb von Familien aus und betrifft insbesondere Kinder, die anfälliger für schwere Erkrankungen sind. TNX-801, das auf synthetisiertem Horsepox basiert, hat in Tierstudien vielversprechende Ergebnisse gezeigt und bietet mit einer besseren Verträglichkeit als traditionelle Vaccinia-Impfstoffe einen Einzeldosisschutz gegen Clade I mpox.
Aktuelle Impfstoffe haben Einschränkungen: Jynneos erfordert zwei Dosen und ist nur 66% wirksam bei vollständiger Dosierung, während ACAM2000 erhebliche Nebenwirkungen hat. TNX-801 entspricht den Anforderungen der WHO für einen idealen mpox-Impfstoff und bietet potenziellen Einzeldosisschutz, konventionelle Herstellungsverfahren und die Fähigkeit, die zukünftige Übertragung zu begrenzen.
- TNX-801 showed single-dose protection in animal studies
- Vaccine prevents clinical disease and reduces viral shedding
- Uses conventional manufacturing processes for potential mass production
- Better tolerability than traditional vaccinia vaccines
- TNX-801 is still in preclinical stage, not yet approved
- Efficacy and safety in humans not yet demonstrated
- Competing vaccines already in market despite limitations
Insights
Tonix Pharmaceuticals' TNX-801 vaccine candidate for mpox presents an interesting development amid the expanding Clade I mpox outbreak now designated as a global health emergency by WHO. The current vaccine landscape has clear limitations - Jynneos requires two doses with only 66% efficacy when fully administered, while ACAM2000 faces tolerability challenges preventing widespread use.
Preclinical data for TNX-801 suggests several potential advantages: single-dose protection, prevention of clinical disease and lesions, reduced viral shedding, and the ability to block transmission. The vaccine's development using conventional cell culture systems could facilitate scalable manufacturing if successful in clinical trials.
However, several critical factors temper immediate enthusiasm. TNX-801 remains in preclinical development with no human data yet available. The timeline to potential approval remains unclear, with no information on when clinical trials might begin. The WHO's expressed need for single-dose, thermostable vaccines with durable protection creates a market opportunity, but many vaccine candidates show promise in animal models only to face challenges in human trials.
It's particularly important to note this is sponsored content from Tonix Pharmaceuticals, providing a naturally positive framing of the company's product without the balanced perspective of independent research.
For a small-cap biotech with
From an investment perspective, this program likely represents an asymmetric risk-reward scenario. The acute global need creates potential for accelerated development pathways if the technology proves viable in humans. The vaccine's claimed advantages address specific WHO requirements, potentially positioning it favorably if development progresses.
However, several factors warrant investor caution. First, this remains a preclinical asset without human data. The path from animal studies to approved product is long, expensive, and high-risk. Second, the article lacks specifics on development timelines, funding requirements, or potential partnering strategies essential for bringing a vaccine to market. Third, as sponsored content, it naturally emphasizes positives while minimizing risks.
Given Tonix's diverse pipeline and resources, questions remain about the company's ability to advance multiple programs simultaneously. The mpox emergency creates opportunity, but investors should recognize TNX-801 remains speculative at this early stage with considerable development hurdles ahead.
Clade I, the culprit in the current 2025 version of global epidemic mpox, is highly transmissible and is spreading within families and among children, whereas the 2022 Clade II mpox - still spreading - infects mostly gay men
CHATHAM, NJ / ACCESS Newswire / March 20, 2025 / This post was written and published as a collaboration between the in-house editorial team at Benzinga and Tonix Pharmaceuticals Holding Corp. with financial support from Tonix. The two organizations work to ensure that any and all information contained within is true and accurate as of the date hereof to the best of their knowledge and research. This content is for informational purposes only and not intended to be investing advice.

Click here for an 8 -minute video of Seth Lederman, M.D. reviewing the status of TNX-801 for mpox
A new strain of mpox, previously known as monkeypox, is spreading around the world, prompting the World Health Organization to further extend its public health emergency of international concern which had been put in place for the second time in two years.
While over 45,000 cases and 1,4000 deaths so far since 2022 have been in African countries , representing a
This new Clade I mpox is different from the version that spread rapidly around the world in 2022 and infected mostly gay men, called Clade II. The new version spreads within families and affects children. For reasons not fully understood, children are playing an outsized role in transmission of the new virus and are also more susceptible to severe disease. That is worrying health officials since to date, there isn't an effective way to stop the spread of this infectious disease.
Single Dose Vaccine on the Horizon?
Tonix Pharmaceuticals Holding Corp. (NASDAQ:TNXP), a biopharmaceutical company with marketed products and a pipeline of development candidates, is hoping to change that with its TNX-801 vaccine candidate. TNX-801 is a live, minimally replicating, recombinant virus vaccine based on synthesized horsepox that the company says has been shown to provide single-dose immune protection against a monkeypox challenge with better tolerability than 20th-century vaccinia live-virus vaccines in animals. TNX-801 has previously been shown to protect animals against lethal challenge with intratracheal clade I monkeypox virus, reports Tonix.
According to Tonix, after a single dose vaccination, TNX-801 prevented clinical disease and lesions and also decreased shedding in the mouth and lungs of animals challenged with clade I monkeypox. What's more, Tonix reported during a presentation at the World Vaccine Congress-Europe 2024 that TNX-801 does not spread in blood or tissues in these animals, even at an approximately 10 to 1000-fold higher dose than 20th-century vaccinia vaccines. These findings are consistent with TNX-801 inducing mucosal immunity and suggest TNX-801 has the ability to block forward transmission, reports the company.
"Data continue to support TNX-801's strong tolerability and efficacy profiles by continually displaying protective immunity to animals with single-dose administration," said Seth Lederman, M.D., CEO of Tonix. "Synthetic biology is an important technology for vaccine development as viral diseases continue to rapidly evolve. With TNX-801's target profile, favorable shipping and storing requirements and our manufacturing collaboration agreements, we believe TNX-801 is in a strong position to make an impact towards preventing mpox and controlling mpox epidemics."
Current Vaccine Limitations
Two mpox vaccines are available, both with limitations, prompting the WHO to look for additional remedies. The Jynneos® vaccine from Bavarian Nordic, requires two doses to provide full protection and is associated with potential waning immunity over time which could require booster shots. Jynneos is only
The WHO has stated it is looking for vaccines that are single dose, have durable protection, can be administered without special equipment and are stable at ambient temperature. After all, a single-dose vaccine reduces the likelihood of dropouts between doses and enables the more efficient "ring vaccination" strategies. These are critical for controlling outbreaks and preventing the virus from spreading beyond the initial clusters of cases, which can quickly spiral into larger outbreaks if not contained early.
Vaccines that can limit forward transmission and are effective for use in immunocompromised individuals are also on the WHO's list. Tonix says TNX-801 fits the bill, aligning with those requirements, and that its focus on single-dose vaccines adheres to recommendations by the Bipartisan Commission on Biodefense and the U.S. National Academies of Sciences.
Manufacturing for the Masses
The production of TNX-801 uses conventional cell culture systems, which should facilitate mass production and potentially make the TNX-801 vaccine available on a global scale, ensuring that regions most in need have access once approved for use by local regulatory agencies.
Mpox cases are rapidly spreading around the world, and the new Clade I strain has now appeared at least three time in the U.S. Vaccine supplies are limited, particularly in Africa where the need seems to be the greatest. With the current trends in the spread of mpox, the demand for single-dose vaccines that are provide durable immunity with acceptable tolerability is bound to increase. Tonix Pharmaceuticals is hoping to deliver on that demand with TNX-801. If preclinical trials are any evidence, the biopharmaceutical company may be worth keeping an eye on.
* TNX-801 is an investigational new biologic, neither its efficacy nor safety have been demonstrated and it is not approved for any indication.
This post contains sponsored content. This content is for informational purposes only and not intended to be investing advice.
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Contact Information
Jessica Morris
Tonix Pharmaceuticals
investor.relations@tonixpharma.com
862.904.8182
SOURCE: Tonix Pharmaceuticals Holding
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