MVA-BN RSV is our product candidate for the prevention of RSV (Respiratory Syncytial Virus). The vaccine incorporates five different RSV antigens to stimulate a broad immune response against both RSV subtypes (A and B), thus mimicking the immune response observed following a natural response to an RSV infection.
We have rapidly advanced the clinical development of the vaccine and have generated highly promising Phase 2 results, confirming both broad and durable antibody and T cell responses against RSV, as well as mucosal immune responses that may be important for protection against RSV. The Phase 2 program in elderly included a revaccination of subjects after one year, following which the immune responses were rapidly and significantly increased, notably in subjects with the weakest immunity prior to the booster vaccination.
A Phase 3 trial in elderly (≥60 years old) has been planned for initiation n 2021. The randomized, placebo-controlled trial has an adaptive design and will enroll a total of 12,000 to 14,000 subjects over two seasons. The total number of subjects will depend on the independent analysis performed from the first 6,000 subjects enrolled for the first season. The estimated costs to determine futility after the season one will be USD 40 million and if positive, the second season will cost an additional USD 50-70 million, although after passing the first season threshold there would be approximately a 75% chance of successfully reaching the efficacy endpoint of the trial.
RSV (respiratory syncytial virus) has been recognized as a significant cause of respiratory illness in all age groups. It is highly infectious and the most common cause of lower respiratory tract infection in infants and children worldwide, resulting in a high number of hospitalizations. RSV infections are also a serious health concern in the elderly and in adults with cardiopulmonary disease.
According to estimates from WHO, RSV infects more than 64 million people globally each year and causes a similar number of deaths as influenza, yet unlike influenza, there is no vaccine to prevent RSV.
There are only two subtypes of RSV, A and B, which are typically present either simultaneously or alternately during yearly epidemics.