SHELTON, CT / ACCESS Newswire / September 28, 2026 / NanoViricides, Inc. (NYSE:NNVC) (the "Company"), a clinical stage leader developing antiviral drugs that viruses cannot escape, announces that its Phase II Clinical Trial of NV-387 Oral Gummies as a Treatment for the Current Bundibugyo Ebolavirus and other Ebola viruses in the Democratic Republic of Congo ("DRC") has started enrolling and dosing patients at an Ebola Treatment Center in the Ituri province.

This clinical trial is registered in the Pan African Clinical Trials Registry (pactr.samrc.ac.za) database. The unique identification number for this clinical trial is PACTR202608748555077.

The clinical trial is entitled with a descriptive title: "An adaptive, multi-centre Phase IIA/IIB clinical trial of NV-387 oral gummies plus optimised supportive care in adults with Ebola virus disease (Bundibugyo or other orthoebolaviruses): a single-arm safety and dose run-in (Phase IIA) followed by a randomised, controlled, open-label efficacy evaluation with independent blinded-endpoint adjudication (Phase IIB)." Prof. Patrick de Marie Chimusa Katoto is listed as the principal investigator to lead this clinical trial, as previously announced by the Company.

Enrollment and dosing has begun in the Phase IIA part on September 23, 2026 or thereabouts. The Phase IIA part is designed to arrive at a NV-387 dosing protocol that is safe and well tolerated within the context of the disease symptoms and severity. We are aiming for maximum feasible dosing while avoiding non-tolerable adverse events, because of the high fatality rate of the Ebola Bundibugyo Virus Disease (EVD/BVD), in order to make maximum impact on the infecting virus. The dosage protocol arrived at in this Phase IIA part, as stratified by disease severity, will be fixed for use across patients in the Phase IIB part. The Phase IIB part is designed to evaluate safety tolerability and effectiveness of the NV-387 Oral Gummies treatment on the Ebolavirus infection.

"Our DRC Team and the CRO are committed to contribute to produce the best results for the patients, hoping to maximize survival," said Anil R. Diwan, PhD, President of the Company, adding, "NV-387 as an oral treatment could make a great contribution to combatting the current and future Ebola outbreaks if found to be effective as a treatment."

The severity of EVD/BVD is simplistically stratified into (a) a Dry Stage, wherein patient symptoms include fever, aches, pains, and fatigue that can be confused with many other infections; and (b) a Wet Stage, wherein explosive vomiting and diarrhea, the hallmark clinical symptoms, are presented. The Wet Stage may progress to (c ) a Critical Stage, which requires intensive care, with a high fatality rate. Unexplained bleeding may occur in the Wet Stage or Critical Stage. The Dry Stage or the Wet Stage may progress into Recovery Stage. The patient's recovery is slow. The patient is infectious, i.e., can transmit the viral infection to others from the dry stage until full recovery.

Currently, a clinical trial called "PARTNERS" was started as of July 2, 2026¹ to evaluate two drugs that both require delivery by infusion. Approximately 300 patients have already been enrolled in this trial across four groups, namely (i) Infusion of a monoclonal antibody cocktail, MBP134, (ii) Infusion of Remdesivir, (iii) Infusion of MBP134 plus Infusion of Remdesivir, and (iv) a control group with local standard of care.

Infusions are inherently unscalable for the extent of the current ebola outbreak in the resource-poor areas in DRC. Additionally, infusion treatment also increases risks to health care workers such as needle-sticks, as well as due to patient handling and possible blood exposure.

NV-387 is currently the only orally administered drug in clinical trials to the best of our knowledge, and this is why medical professionals in the field are looking forward to success in the clinical trial of NV-387.

Oral NV-387 was compared with Intravenously given Remdesivir given in animal studies of a lethal coronavirus infection model when NV-387 was originally developed as a treatment for COVID-19. NV-387 Oral was found to be superior in extending survival of the lethally infected animals when compared to Remdesivir I.V. in this study. Therefore, the Company believes that NV-387 oral drug can be reasonably expected to provide superior activity compared to at least remdesivir infusion that is already in the PARTNERS clinical trial.

Antibodies are easily overcome by viruses in the field, as was experienced during the COVID-19 pandemic. All antibody drugs that received emergency use approvals lost efficacy within a few months due to mutations in the SARS-CoV-2, an RNA virus. Ebola Bundibugyo is an RNA virus with likely similar rates of mutation. It remains to be seen if and how long MBP134 remains effective during the current Ebola outbreak, even if found to be effective and approved, for use.

The Bundibugyo virus is highly unlikely to escape NV-387, unlike in the case of antibodies such as MBP134. This is because NV-387 mimics a portion of the cell surface that is essential for all Ebola viruses to cause productive infection, no matter how different they are.

"Comparing NV-387 to currently available therapeutics under study leads us to rationally anticipate at least partial success in the proposed clinical trial," said Dr. Diwan, warning, "However, it is the data from the clinical trial that will tell us if NV-387 is effective and can become an important pillar in response to this Ebola Outbreak Crisis in DRC."

The current Ebola Virus Disease (EVD) caused by the Bundibogyo ebolavirus (BDBV) is now the largest ever ebola outbreak, as well as the fastest growing ebola outbreak in DRC.

As of September 23, 2026, there have been 7,890 confirmed cases, 3,799 confirmed deaths, and 1,966 confirmed recoveries in DRC, according to the WHO daily report². In comparison, as of August 14, 2026, there were reported 4,945 confirmed cases and 2,325 confirmed deaths due to this virus. The crude fatality rate (crude CFR)³ is about 48% .

The actual probability of an infected person dying is about 67%, with about 1/3rd of patients recovering in DRC (ibid #2 footnote).

This Ebola outbreak is now the fastest growing ebola outbreak in the world. Additionally, it is also possibly the deadliest ebola outbreak. At this rate, the current outbreak is on track to exceed the worst ever ebola zaire outbreak in West Africa in 2014-2016⁴. In that outbreak, 28,616 cases and 11,310 deaths were recorded across Guinea, Liberia and Sierra Leone, according to the World Health Organization.

Schools have reopened normally in the Ebola affected regions across DRC, despite the well understood risk of transmission in schools. Teaching and implementing hygienic measures such as use of hand sanitizers and frequent hand washing is expected to minimize risk, enabling the children to have in-class education. The alternative of remote learning is very difficult to implement in resource-poor environments, and risks the children's education itself. If cases occur, schools would be shut down. The risk is high, particularly because the crude case fatality rate (CFR) in children is at 60%, much greater than the CFR for adults at sub-50%⁵.

Additionally, health care workers (HCW) are at high risk, despite personal protective equipment, because of close contact with the patients. At least 43 HCWs have died from Ebola and at least 160 have contracted the disease⁶.

The need for an oral drug to combat this disease is thus obvious. An oral drug to treat patients, to prevent contacts from contracting the disease, and to keep healthcare workers safe, is sorely needed to combat this outbreak. There is a tremendous urgency to validate a drug that works against this ebolavirus in short and decisive clinical trials for minimizing further spread by treating patients and for saving lives. Om Sai CRO, in consultation with renowned scientists in DRC, has designed the Phase II clinical trial with this particular objective.

In contrast, in the PARTNERS clinical trial, infusions of antibody cocktails and of remdesivir are being tried. This trial will require over 1,000 patients to be treated and may not yield results for several months. A similar large collaborative clinical trial effort in the West Africa 2014-2016 outbreak resulted in US FDA approval of two antibody drugs only specifically for EBOV Zaire, which are not deemed to be useful in the current outbreak without further clinical trials.

Three different vaccines are also expected to enter into clinical trials for efficacy within months, according to the WHO⁷. Ervebo, a vaccine developed for Ebola Zaire, is being deployed in a research protocol to health care workers. Its efficacy against BDBV needs to be evaluated in a clinical trial, according to WHO.

As of now, there is practically no risk from this Ebola outbreak for the USA, according to the CDC. The US has imposed strict travel restrictions to avoid any possible introduction of the ebola virus into the USA. The CDC is intimately involved in the Ebola response with 150 personnel deployed within DRC for the efforts (ibid #1).

NanoViricides has retained Om Sai Clinical Research Private Limited, India, (Om Sai CRO) as the CRO for this Phase II clinical trial for Ebola in DRC. Om Sai CRO has been instrumental in putting together the team with Prof. Katoto and other renowned experts and with support from the University of Bukavu and in the Ebola-affected region to lead and execute the clinical trial of NV-387 Oral Gummies as a Treatment for Ebola viruses in DRC.

As the Ebola outbreak continues to expand, several limitations on travel are being instated. There are also limitations on availability of resources such as PPE and diagnostic kits, which are compounded by the travel and other restrictions. These on-ground situations have caused delays in our efforts, and we anticipate such delays to continue due to the tenuous outbreak situation.

This Ebola outbreak continues to increase in spread and is now present in at least six provinces in DRC and threatening South Sudan⁸. More concerning is the fact that over 80% of new cases are outside of known contact lists, leading to the projection that the extent of the outbreak is at least two times or more larger than the reported confirmed cases. Additionally, Ebola is now found to have spread into displacement camps that host over 4.4 million displaced persons due to internal warfare, adding another high risk population pool with poor drinking water, sanitation and medical resources to further fuel this outbreak, according to the UN New Service.

There is no approved Treatment or Vaccine for the new variant of the Bundibugyo Ebolavirus (BDBV) that is causing the current rapidly expanding outbreak of the Ebolavirus Disease (EVD) in DRC. The rare Bundibugyo strain of Ebola virus causing the current outbreak appears to be its new variant, likely freshly introduced from some animal source⁹, such as fruit bats.

"Although this antiviral (Remdesivir) proved to be ineffective at targeting the Zaire Ebolavirus, there remains hope that it could have some benefit against the Bundibugyo virus, particularly if used in combination with MBP-134," according to an article in Forbes explaining the "PARTNERS" clinical trial by the WHO organized collaboration¹⁰. The article also notes that MBP134 contains two separate antibodies designed to, taken together, recognize multiple Ebola species.

Antibodies are highly specific to a particular strain of the virus and usually are not very effective against variants of the same virus that arise in the field. Viruses also escape antibodies readily by mutations in the field.

NV-387 is a broad-spectrum antiviral that mimics the host-side features that the virus requires, and is likely to be effective against Ebola viruses because they use the same host-side feature mimicked by NV-387.

NV-387 Oral Gummies is a drug product readily delivered orally. It does not even require swallowing effort or water, because it dissolves in the mouth by itself, simplifying delivery for even sick individuals with swallowing difficulties.

This oral delivery is an important feature that puts NV-387, a broad-spectrum antiviral, as being superior to the other approaches.

"Only safe and effective broad-spectrum antiviral drugs like NV-387 that can effectively tackle most viral infections will enable the world to combat viruses and defend the global population in the war against known and unknown nanoscopic enemies that are viruses," commented Dr. Diwan, adding, "Today, NV-387 is the only drug in clinical development with such broad-spectrum potential that promises to combat diverse epidemics like Mpox and Ebola, to the best of our knowledge."

While there is currently minimal risk of Ebola in the USA, the CDC's mathematical models suggested this Central African outbreak could grow to 10,000 to 20,000 cases and 2,000 to 4,000 deaths within just three months, rivaling the largest outbreak to date in 2014-2016¹¹. Unfortunately, the outbreak appears to be even more aggressive than the CDC model, with over 2,000 deaths in less than three months, over 4,000 confirmed cases, and over 10,000 estimated total cases¹².

The outbreak which was declared a Public Health Emergency of International Concern ("PHEIC") by the WHO on May 17, 2026, continues to rapidly expand, outpacing containment efforts. The outbreak arose in a high traffic region bordering the Democratic Republic of Congo (DRC), with travel contacts to Uganda, and South Sudan and with 11 more nations in Africa at risk¹³.

NV-387 is a broad-spectrum antiviral that mimics the host-side feature called heparan sulfate proteoglycan (HSPG) that over 90-95% of human pathogenic viruses require for infecting cells. No matter how much the virus changes in the field, it continues to use HSPG, and therefore it cannot escape the drug NV-387. In contrast, Remdesivir is a small molecule inhibitor of the viral RDRP enzyme needed for making copies of the viral genome, and the virus can possibly escape by small number of mutations.

All Ebola viruses utilize HSPG as the attachment receptor prior to gaining entry into the cell. Thereafter, followed by entry into the cell inside endosomes, the ebolavirus surface glycoprotein is substantially degraded, opening up its site for binding to its cognate receptor called NPC1, thereby entering into the cytoplasm where the next steps in its replication begin.

Thus there is a strong rationale that NV-387 could be highly effective against Ebola virus infections, not just Bundibugyo, but also the Sudan and other viruses for which there are no treatments.

All previous anti-Ebola efforts have been focused on vaccines and antibodies¹⁴. This has led to approval of therapies that are specific to the Ebolavirus Zaire strain only, albeit with limited effectiveness. This leaves out all other filoviruses of consequence: Sudan, Marburg, and the more rare Bundibugyo with no treatment or vaccine.

In contrast, if NV-387, as a broad-spectrum antiviral, is found to be effective against the Bundibugyo virus, it will likely be effective against all ebolaviruses and possibly all filoviruses; that would be a game changer for pandemic preparedness.

The case fatality rate of ebolaviruses has generally been approximately 50% in recent outbreaks, with improvements in care, including hydration therapy, corticosteroids, and other usual symptomatic treatments. Ebola viruses spread via bodily fluid secretions including fomites/sputum, as well as semen/genital secretions. Ebola virus can remain in survivors even as many as 965 days after the disease without symptoms, and can transmit through bodily secretions, suggesting possible latency. Many recent outbreaks have been ignited as a result of such reawakened-transmitted virus from a survivor. Sexual transmission was documented even as late as 482 days after disease. This persistence and possible latency of ebolavirus in immune-privileged organs (e.g. brain, eyes, gonads, where antibodies are not operative) makes it a uniquely serious threat for global transmission and sustained outbreaks.

At present, BDBV has been consistently demonstrating high crude CFR of 48% in DRC. Therefore, BDBV is of great concern as a potential pandemic disease. However, it is believed that ebolaviruses do not transmit via respiratory droplets or aerosols and rather require extensive contact with bodily fluids of an infected person. In addition, within DRC and internationally, certain protective quarantine measures for travel from the outbreak areas have been implemented.

Therefore, currently there is no apparent threat of a global pandemic.

An irony is that because of the high case fatality rate (CFR) approaching 50%, the spread of ebolaviruses remains rather limited. If a variant emerges with a reduced CFR, say in the range of 5-15%, the potential threat of global pandemic from such an outbreak would increase substantially.

With ever-increasing global travel, local outbreaks such as ebola can quickly travel far and wide potentially causing global pandemics, as was the case with COVID-19, if not caught in time. It is not feasible to produce a new vaccine and a new set of antibody drugs to combat every possible virus. Even if vaccines and antibodies are produced, the virus would escape by generating variants, as the world has witnessed during the COVID-19 pandemic.

The US Government is active in ensuring that suspected or confirmed ebolavirus cases do not enter the general population in the USA. To this end, travel from DRC has been restricted, with pre-travel quarantine requirements imposed, and suspect travelers are directed to screening at specific airports and may be further quarantined.

Travelers going to and from Central Africa need to constantly check travel restrictions as well as travel limitations in light of these changing outbreak conditions.

ABOUT NANOVIRICIDES

NanoViricides, Inc. (the "Company") (www.nanoviricides.com) is a clinical stage company that is creating special purpose nanomaterials for antiviral therapy. The Company's novel nanoviricide™ class of drug candidates and the nanoviricide™ technology are based on intellectual property, technology and proprietary know-how of TheraCour Pharma, Inc. The Company has a Memorandum of Understanding with TheraCour for the development of drugs based on these technologies for all antiviral infections. The MoU does not include cancer and similar diseases that may have viral origin but require different kinds of treatments.

The Company has obtained broad, exclusive, sub-licensable, field licenses to drugs developed in several licensed fields from TheraCour Pharma, Inc. The Company's business model is based on licensing technology from TheraCour Pharma Inc. for specific application verticals of specific viruses, as established at its foundation in 2005.

Our lead drug candidate is NV-387, a broad-spectrum antiviral drug that we plan to develop as a treatment of RSV, COVID, Long COVID, Influenza, and other respiratory viral infections, as well as MPOX/Smallpox infections. Our other advanced drug candidate is NV-HHV-1 for the treatment of Shingles. The Company cannot project an exact date for filing an IND for any of its drugs because of dependence on a number of external collaborators and consultants. The Company is currently focused on advancing NV-387 into Phase II human clinical trials.

NV-CoV-2 (API NV-387) is our nanoviricide drug candidate for COVID-19 that does not encapsulate remdesivir. NV-CoV-2-R is our other drug candidate for COVID-19 that is made up of NV-387 with remdesivir encapsulated within its polymeric micelles. The Company believes that since remdesivir is already US FDA approved, our drug candidate encapsulating remdesivir is likely to be an approvable drug, if safety is comparable. Remdesivir is developed by Gilead. The Company has developed both of its own drug candidates NV-CoV-2 and NV-CoV-2-R independently.

The Company is also developing drugs against a number of viral diseases including oral and genital Herpes, viral diseases of the eye including EKC and herpes keratitis, H1N1 swine flu, H5N1 bird flu, seasonal Influenza, HIV, Hepatitis C, Rabies, Dengue fever, and Ebola virus, among others. NanoViricides' platform technology and programs are based on the TheraCour^® nanomedicine technology of TheraCour, which TheraCour licenses from AllExcel. NanoViricides holds a worldwide exclusive perpetual license to this technology for several drugs with specific targeting mechanisms in perpetuity for the treatment of the following human viral diseases: Human Immunodeficiency Virus (HIV/AIDS), Hepatitis B Virus (HBV), Hepatitis C Virus (HCV), Rabies, Herpes Simplex Virus (HSV-1 and HSV-2), Varicella-Zoster Virus (VZV), Influenza and Asian Bird Flu Virus, Dengue viruses, Japanese Encephalitis virus, West Nile Virus, Ebola/Marburg viruses, and certain Coronaviruses. The Company intends to obtain a license for RSV, Poxviruses, and/or Enteroviruses if the initial research is successful. As is customary, the Company must state the risk factor that the path to typical drug development of any pharmaceutical product is extremely lengthy and requires substantial capital. As with any drug development efforts by any company, there can be no assurance at this time that any of the Company's pharmaceutical candidates would show sufficient effectiveness and safety for human clinical development. Further, there can be no assurance at this time that successful results against coronavirus in our lab will lead to successful clinical trials or a successful pharmaceutical product.

This press release contains forward-looking statements that reflect the Company's current expectation regarding future events. Actual events could differ materially and substantially from those projected herein and depend on a number of factors. Certain statements in this release, and other written or oral statements made by NanoViricides, Inc. are "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. You should not place undue reliance on forward-looking statements since they involve known and unknown risks, uncertainties and other factors which are, in some cases, beyond the Company's control and which could, and likely will, materially affect actual results, levels of activity, performance or achievements. The Company assumes no obligation to publicly update or revise these forward-looking statements for any reason, or to update the reasons actual results could differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future. Important factors that could cause actual results to differ materially from the company's expectations include, but are not limited to, those factors that are disclosed under the heading "Risk Factors" and elsewhere in documents filed by the company from time to time with the United States Securities and Exchange Commission and other regulatory authorities. Although it is not possible to predict or identify all such factors, they may include the following: demonstration and proof of principle in preclinical trials that a nanoviricide is safe and effective; successful development of our product candidates; our ability to seek and obtain regulatory approvals, including with respect to the indications we are seeking; the successful commercialization of our product candidates; and market acceptance of our products.

The phrases "safety", "effectiveness" and equivalent phrases as used in this press release refer to research findings including clinical trials as the customary research usage and do not indicate evaluation of safety or effectiveness by the US FDA.

FDA refers to US Food and Drug Administration. IND application refers to "Investigational New Drug" application. cGMP refers to current Good Manufacturing Practices. CMC refers to "Chemistry, Manufacture, and Controls". CHMP refers to the Committee for Medicinal Products for Human Use, which is the European Medicines Agency's (EMA) committee responsible for human medicines. API stands for "Active Pharmaceutical Ingredient". WHO is the World Health Organization. R&D refers to Research and Development.

Contact:
NanoViricides, Inc.
info@nanoviricides.com

Public Relations Contact:
ir@nanoviricides.com

1 https://www.reuters.com/business/healthcare-pharmaceuticals/trial-bundibugyo-ebola-treatment-starts-drc-who-says-2026-07-02/

2 https://www.who.int/emergencies/alert-and-response , retrieved on Monday September 28, 2026 at 00:58 EDT. See also, https://www.cdc.gov/ebola/situation-summary/index.html .

Previously, as of September 10, 2026, there were 7,022 confirmed cases, 3,398 confirmed deaths, and 1,671 confirmed recoveries in DRC, according to the WHO daily report. In comparison, as of August 14, 2026, there were reported 4,945 confirmed cases and 2,325 confirmed deaths due to this virus.

3 The Crude CFR is calculated simply by dividing the confirmed deaths by the confirmed number of cases on the same reporting date. It ignores the fact that the deaths are actually occurring in patients that were confirmed infected several days earlier; i.e. the time lag of sickness is not accounted for in the crude CFR. If it is accounted for, the actual fatality rate per confirmed infection (Infected Fatality Rate or IFR) would be much higher than the crude CFR. For example, if one assumes an average time lag of 21 days (Aug 14 to Sept 5), then the IFR on September 5 would be (3,175/4,945 = ) 64%. Not all infections are reported or confirmed by lab tests; however, it is likely that most deaths are counted. This produces a large uncertainty in such CFR and IFR estimates. Another way to estimate IFR would be to simply take a ratio of confirmed deaths to that of confirmed deaths plus confirmed recoveries. This metric, probability of death, is more robust and insensitive to the lag times, except it ignores patients that are still in hospital. The p(death) based on this metric is (using Sept. 10 numbers,(3,398)/(3,398 +1,671) = 67% . That said, a number of cases as well as deaths remain unconfirmed or unreported because of the regional issues.

4 https://www.telegraph.co.uk/global-health/science-and-disease/ebola-outbreak-doubling-every-20-days-warns-un-chief/

5 https://www.news4jax.com/news/world/2026/09/01/schools-resume-classes-in-congos-ebola-epicenter-despite-concerns-from-parents-and-teachers/ .

6 https://www.ft.com/content/abd30cb8-08f6-4a1a-a92b-f1fcc339ea82?syn-25a6b1a6=1&signupConfirmation=success

7 https://www.yahoo.com/news/science/articles/congo-ebola-outbreak-slows-epicentre-050000953.html

8 https://www.aljazeera.com/news/2026/7/20/ebola-death-toll-in-drc-surges-to-at-least-930-as-outbreak-gathers-pace

https://www.aljazeera.com/news/2026/7/16/ebola-spreading-more-quickly-in-drc-while-uganda-is-close-to-being-virus-free

9 https://virological.org/t/initial-genomes-from-may-2026-bundibugyo-virus-disease-outbreak-in-the-democratic-republic-of-the-congo-and-uganda/1032

10 https://www.forbes.com/sites/omerawan/2026/07/07/new-clinical-trials-offer-hope-in-the-fight-against-ebola-in-the-democratic-republic-of-congo/

11 https://www.cdc.gov/media/releases/2026/update-on-ebola-outbreak-in-the-democratic-republic-of-the-congo-and-uganda-6-5-2026.html

12 The WHO and Africa CDC have estimated that the confirmed case number substantially under-represents actual case numbers which could be at least double or even more than confirmed cases. See #5.

13 https://www.forbes.com/sites/maryroeloffs/2026/05/25/african-health-officials-on-ebola-this-is-too-much-live-updates/

14 Substantial work was also performed to develop small chemical potentially broad-spectrum agents. Remdesivir was the only small chemical that entered the PALM clinical trials ca. 2018-2019 but failed to show effectiveness. Small chemicals are readily escaped by viruses often with just single mutations.

SOURCE: NanoViricides

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