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Higher Immune Response Seen in Menveo Vaccine Compared to Menactra
Results of this first head-to-head trial of Menveo compared to Menactra, show that adolescents who were immunized with Menveo generated higher levels of antibodies against all four serogroups.
Notably for serogroup Y, among adolescents with low levels of immunity at the time of vaccination, 81% of subjects receiving Menveo generated a protective immune response vs. 54% with Menactra, as measured by the hSBA assay. Serogroup Y causes approximately 39% of meningococcal disease cases in the US.
"To protect children against all major serogroups of meningococcal disease, we need vaccines that provide broad coverage and that can be used in all at-risk age groups," said Keith S. Reisinger, MD, MPH, Medical Director, Primary Physicians Research, Inc. Pittsburgh, PA. "These data are encouraging because they show that Menveo may provide greater protection for the more than 8 million infants and adolescents in the US against these four vaccine-preventable serogroups than the currently available vaccine."
Menveo is an investigational quadrivalent meningococcal conjugate vaccine in Phase III clinical development by Novartis Vaccines. The data were presented at a late-breaker platform session on May 5 during the 2008 Pediatric Academic Societies (PAS) Annual Meeting in Honolulu, Hawaii.
Meningococcal disease, a leading cause of bacterial meningitis, is a rare but contagious and potentially life-threatening infection. Infants and adolescents have the highest rates of disease, which can be fatal. Each year approximately 1,400 to 2,800 cases of disease occur in the US, and about 10-14 percent of patients die. The currently available vaccines are not licensed for use in infants, in whom the highest rates of meningococcal disease are observed. Phase II data published in the January 9, 2008, issue of the Journal of the American Medical Association demonstrated Menveo to be the first meningococcal vaccine to produce a strong immune response in infants.
The US Centers for Disease Control and Prevention (CDC) recommends routine immunization with a quadrivalent meningococcal conjugate vaccine for all adolescents 11-18 years of age, college freshmen living in dormitories and people in other high risk groups who are two to ten or 19-55 years of age.
"The patient need for vaccines for meningococcal disease remains substantial. We are quickly realizing our goal of providing broad coverage against all serogroups of meningococcal disease across all age groups," said Joerg Reinhardt, CEO of Novartis Vaccines and Diagnostics. "Given the broad range of age groups this vaccine is expected to protect, Menveo could truly fulfill an unmet need in the meningitis vaccine market."
This Phase III trial involved more than 2,100 11-18 year olds who received a single vaccination with either Menveo or Menactra. One month after vaccination, geometric mean titers (a measure of immune response) for Menveo vs. Menactra were: serogroup A, 29 vs. 18; serogroup C, 59 vs. 47; serogroup W-135, 87 vs. 44; and serogroup Y, 51 vs. 18. Additionally, the percentage of participants who achieved a protective immune response, determined by a human serum bactericidal antibody titer (hSBA) greater than or equal to 1:8, with Menveo vs. Menactra was: serogroup A, 75% vs. 67%; serogroup C, 84% vs. 84%; serogroup W-135, 96% vs 88%; and serogroup Y, 88% vs. 69%. Similar results were seen in the large subset of sero-negative participants, who are the participants without any natural immunity to the bacteria before vaccination. The hSBA assay measures the body's protective immune response to the meningococcus based on the ability of antibodies to kill the bacteria.
These data build on previous studies that demonstrated Menveo generates a strong protective immune response against these four vaccine-preventable serogroups in people across age groups from infancy to adulthood. Novartis expects to submit a Biologics License Application (BLA) to the US Food and Drug Administration later this year.
Menveo is currently in multiple Phase III clinical trials involving infants, young children, adolescents and adults. The vaccine is based on the same technology Novartis pioneered to produce Menjugate®, a meningococcal serogroup C conjugate vaccine approved outside the US since 2000 for use in individuals from two months of age through adulthood.
Novartis is a global leader in providing vaccines to protect against the deadly meningococcal disease. In addition to developing Menveo, Novartis has already distributed more than 26 million doses of Menjugate around the world and produced MenZB®, a vaccine against a strain of meningococcus B specific to a recent outbreak in New Zealand. Novartis is also developing a recombinant vaccine to provide broad coverage against multiple strains of serogroup B, for which no vaccine is currently available.
About meningococcal disease, a leading cause of bacterial meningitis
Meningococcal disease can manifest as bacterial meningitis -- an infection of the membranes around the brain and spinal cord -- or sepsis, a bloodstream infection. It is caused by the bacterium Neisseria meningitidis (N. meningitidis). The symptoms -- which can include sudden onset of fever, rash, headache, and stiff neck -- can progress rapidly. Even with early and appropriate treatment, some cases are fatal, typically within 24-48 hours. For those who survive, as many as 19 percent suffer serious long-term consequences such as deafness, neurological damage or limb loss.