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GeoVax Reports Positive Interim Data From Phase 2 Clinical Trial of GEO-CM04S1 as a Universal Covid-19 Vaccine Booster

Results Demonstrate Potential Protective Immunity Against Multiple SARS-CoV-2 Variants

ATLANTA, GA - (NewMediaWire) - February 06, 2024 - GeoVax Labs, Inc. (Nasdaq: GOVX), a biotechnology company developing immunotherapies and vaccines against cancers and infectious diseases, today announced positive initial safety and immune response findings from its Phase 2 clinical trial at one month following administration of its Covid-19 vaccine, GEO-CM04S1. The trial, evaluating GEO-CM04S1 as a heterologous booster in 63 healthy adults who had previously received the Pfizer or Moderna mRNA vaccine ( Identifier: NCT04639466), was fully enrolled at the end of Sept 2023.


The study is designed to evaluate the safety and immunogenicity of two GEO-CM04S1 dose levels. The trial remains blinded to dose of vaccine received, with study subjects being followed for a total of one year. To date, there have been no serious adverse events, and adverse events were in line with other routine vaccinations. The immunological responses measured throughout the study period include both neutralizing antibodies against SARS-CoV-2 variants and specific T-cell responses. Consolidated data from all subjects tested one-month post-vaccination, documented statistically significant increases in neutralizing antibody responses against multiple SARS-CoV-2 variants, ranging from the original Wuhan strain through Delta and Omicron XBB 1.5; additional testing against the JN.1 variant is underway.


GEO-CM04S1 is a next-generation Covid-19 vaccine based on GeoVax’s MVA viral vector platform, which supports the presentation of multiple vaccine antigens to the immune system in a single dose. GEO-CM04S1 encodes for both the spike (S) and nucleocapsid (N) antigens of SARS-CoV-2 and is specifically designed to induce both antibody and T-cell responses to those parts of the virus less likely to mutate over time. The more broadly functional engagement of the immune system is designed to protect against severe disease caused by continually emerging variants of Covid-19. Vaccines of this format should not require frequent and repeated modification or updating. These latest findings lend support to previously published findings in cell transplant patients of the ability of GEO-CM04S1 to stimulate functional antibody responses against a broad array of evolving SARS-CoV-2 virus variants (Chiuppesi et al, Vaccines, Sept 2023).

Kelly McKee, Jr., MD, MPH, GeoVax Chief Medical Officer, stated, “There is a critical need to address the recognized shortcomings of currently approved SARS-CoV-2 vaccines. Annual (or even more frequent) vaccination in a seemingly never-ending race to keep pace with this rapidly evolving virus is an unsustainable strategy. GEO-CM04S1 continues to demonstrate the ability to elicit broadly reactive functional antibodies in conjunction with robust and durable T-cell responses, offering the prospect of a next-generation solution to address these shortcomings.”

“We are thrilled by these data and our investigational vaccine designed to protect against severe disease caused by emerging variants of Covid-19,” said David Dodd, GeoVax Chairman and CEO. “These interim data reinforce our resolve to bring our expertise in the development of innovative vaccines to address critical public health needs using new approaches and technologies. We look forward to providing further updates regarding the successful progress of the clinical development of GEO-CM04S1.”

About GeoVax

GeoVax Labs, Inc. is a clinical-stage biotechnology company developing novel therapies and vaccines for solid tumor cancers and many of the world’s most threatening infectious diseases. The company’s lead program in oncology is a novel oncolytic solid tumor gene-directed therapy, Gedeptin®, presently in a multicenter Phase 1/2 clinical trial for advanced head and neck cancers. GeoVax’s lead infectious disease candidate is GEO-CM04S1, a next-generation Covid-19 vaccine targeting high-risk immunocompromised patient populations. Currently in three Phase 2 clinical trials, GEO-CM04S1 is being evaluated as a primary vaccine for immunocompromised patients such as those suffering from hematologic cancers and other patient populations for whom the current authorized Covid-19 vaccines are insufficient, and as a booster vaccine in patients with chronic lymphocytic leukemia (CLL). In addition, GEO-CM04S1 is in a Phase 2 clinical trial evaluating the vaccine as a more robust, durable Covid-19 booster among healthy patients who previously received the mRNA vaccines. GeoVax has a leadership team who have driven significant value creation across multiple life science companies over the past several decades. For more information, visit our website:

Forward-Looking Statements

This release contains forward-looking statements regarding GeoVax’s business plans. The words “believe,” “look forward to,” “may,” “estimate,” “continue,” “anticipate,” “intend,” “should,” “plan,” “could,” “target,” “potential,” “is likely,” “will,” “expect” and similar expressions, as they relate to us, are intended to identify forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy and financial needs. Actual results may differ materially from those included in these statements due to a variety of factors, including whether: GeoVax is able to obtain acceptable results from ongoing or future clinical trials of its investigational products, GeoVax’s immuno-oncology products and preventative vaccines can provoke the desired responses, and those products or vaccines can be used effectively, GeoVax’s viral vector technology adequately amplifies immune responses to cancer antigens, GeoVax can develop and manufacture its immuno-oncology products and preventative vaccines with the desired characteristics in a timely manner, GeoVax’s immuno-oncology products and preventative vaccines will be safe for human use, GeoVax’s vaccines will effectively prevent targeted infections in humans, GeoVax’s immuno-oncology products and preventative vaccines will receive regulatory approvals necessary to be licensed and marketed, GeoVax raises required capital to complete development, there is development of competitive products that may be more effective or easier to use than GeoVax’s products, GeoVax will be able to enter into favorable manufacturing and distribution agreements, and other factors, over which GeoVax has no control.

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