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Pharmaceutical giant GlaxoSmithKline aims to get its respiratory syncytial virus (RSV) vaccine to regulators for review later this year, after interim data showed the vaccine was effective in a keenly-watched late-stage study involving older adults. RSV is a leading cause of pneumonia in toddlers and the elderly, but the complex molecular structure of the virus and safety concerns have stymied efforts to develop a vaccine since the virus was first discovered in 1956. Companies including Pfizer, J&J, Sanofi, Moderna and AstraZeneca are also racing to get an RSV therapy or vaccine approved. The latest GSK trial is the first to show statistically significant efficacy for RSV in adults aged 60 years and older, the British drugmaker said of the ongoing study on Friday (June 10). If approved, the RSV vaccine is expected to generate billions for GSK, which is already the world's biggest vaccine maker by sales but has faced pressure from activist investors such as Elliott Management who have urged the London-based company to shore up its drug pipeline.

Pfizer on Thursday said a single dose of its new respiratory syncytial virus (RSV) vaccine Abrysvo maintained its ability to protect against the illness through a second year of respiratory disease season. The company said in a press release that the vaccine's efficacy against RSV-associated lower respiratory tract disease with three or more symptoms was 77.8 per cent through season two, compared with efficacy of 88.9 per cent after the first RSV season, which led to the shot's US approval. The data is from a late-stage trial of more than 37,000 participants being conducted in both the Northern and Southern hemispheres. Cumulative efficacy over both seasons after around 16.4 months of disease surveillance was 81.5 per cent, Pfizer said. The data is similar to the efficacy of GSK's rival RSV shot Arexvy over two seasons, which was released in June.