A Randomised, Placebo-Controlled, Dose-Ranging, Observer-Blind Phase 1/2 Study to Evaluate the Safety, Tolerability, and Immunogenicity of mRNA-1769 in Healthy Participants
The goal of this study is to assess the safety, tolerability and immunogenicity of mRNA-1769 in healthy adult participants.
mRNA vaccines: A promising platform for safer, more effective next-generation Orthopoxvirus immunization
Article
作者: Yan, Jinghua ; Han, Xiaonan ; Huang, Qingrui
In recent work, Mucker et al.1 demonstrated that mRNA-1769 outperforms modified vaccinia Ankara (MVA), which has been deployed against recent mpox virus (MPXV) outbreaks, in reducing clinical symptoms and controlling viral replication, highlighting its potential as a scalable, safe, and effective next-generation platform for orthopoxvirus vaccination.
npj Vaccines
Mpox mRNA-1769 vaccine inhibits orthopoxvirus replication at intranasal, intrarectal, and cutaneous sites of inoculation
Article
作者: Hooper, Jay W ; Ignacio, Maxinne A ; Carfi, Andrea ; Americo, Jeffrey L ; Freyn, Alec W ; Earl, Patricia L ; Mucker, Eric M ; Cotter, Catherine A ; Frey, Tiffany R ; Moss, Bernard
Abstract:
We previously reported that mice immunized twice with a lipid nanoparticle vaccine comprising four monkeypox viral mRNAs raised neutralizing antibodies and antigen-specific T cells and were protected against a lethal intranasal challenge with vaccinia virus (VACV). Here we demonstrated that the mRNA vaccine also protects mice against intranasal and intraperitoneal infections with monkeypox virus and bioluminescence imaging showed that vaccination greatly reduces or prevents VACV replication and spread from intranasal, rectal, and dermal inoculation sites. A single vaccination provided considerable protection that was enhanced by boosting for at least 4 months. Protection was related to the amount of mRNA inoculated, which correlated with neutralizing antibody levels. Furthermore, immunocompetent and immunodeficient mice lacking mature B and T cells that received serum from mRNA-immunized macaques before or after VACV challenge were protected. These findings provide insights into the mechanism and extent of mRNA vaccine-induced protection of orthopoxviruses and support clinical testing.
Signal Transduction and Targeted Therapy
Correction: Next-generation mpox vaccines: efficacy of mRNA-1769 compared to modified vaccinia virus Ankara in non-human primates
作者: Addo, Marylyn M ; Mayer, Leonie ; Weskamm, Leonie M
MVA-BN is marketed as Jynneos in the US and as Imvanex in Europe. Image credit: Sonia Bonet / Shutterstock.
Bavarian Nordic
is looking to expand the approval label of its MVA-BN mpox/smallpox vaccine to include children two to 11 years of age and has started a Phase II trial to support the approval.
The Phase II study (NCT06549530) plans to compare the safety and immunogenicity of the vaccine between children in that age group to adults. The trial is partially funded by the Coalition for Epidemic Preparedness Innovations (CEPI).
The Danish vaccine company intends to recruit participants across the Democratic Republic of Congo and potentially Uganda. The World Health Organization (WHO)
declared
mpox a global public health emergency for the second time in two years in August after a new type of the virus spread from the Democratic Republic of Congo to neighbouring countries.
MVA-BN is a non-replicating mpox vaccine. It is marketed as Jynneos in the US and as Imvanex in Europe. In September, the European Medicines Agency (EMA)
expanded the vaccine label
to include adolescents over 12 years of age. The same month, the Global Alliance for Vaccines and Immunization (GAVI) entered into a
purchase agreement with Bavarian Nordic
to secure 500,000 doses for countries in Africa.
Bavarian Nordic noted that whilst the Phase II trial marks the first investigation of MVA-BN as an mpox/smallpox vaccine for younger children, a recombinant version of the vaccine, Mvabea, was approved by the EMA in 2020 as part of a prime-boost vaccine regimen for the prevention of disease caused by Ebola virus in individuals one year of age and older.
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“The findings of this study will be crucial in shaping mpox vaccine strategies that could protect children and bring an end to this devastating and widespread outbreak, while also providing pivotal vaccine guidance in local endemic populations to tackle mpox outbreaks that could strike in the future,” said Dr Nicole Lurie, executive director of preparedness and response at CEPI.
The mpox/smallpox vaccine has been
a major revenue driver
for Bavarian Nordic. The vaccine generated DKK5bn ($724m) in revenue from global vaccine sales and
government contracts
last year, as per the company’s financials.
Another
mpox vaccine in development
is
Moderna
’s mRNA vaccine, currently being trialled in a Phase I/II study (NCT05995275). The trial is evaluating the safety, tolerability, and immunogenicity of mRNA-1769 in healthy adults.