Growing a better polio vaccine

Researchers use plants as factories to produce a safer polio vaccine

Successful vaccination campaigns have reduced the number of polio cases by over 99% in the last several decades. However, producing the vaccines entails maintaining a large stock of poliovirus, raising the risk that the disease may accidentally be reintroduced.
Outbreaks can also occur due to mutation of the weakened poliovirus used in the oral vaccine. In addition, the oral vaccine has to be stored at cold temperatures. To address these shortcomings, an international team of researchers across the UK has engineered plants that produce virus-like particles derived from poliovirus, which can serve as a vaccine.
They report the success of this approach in a paper appearing in Nature Communications. The team confirmed the structure of the virus-like particles by cryo-electron microscopy at Diamond Light Source’s Electron Bio-Imaging Centre (eBIC) and showed that the particles effectively protected mice from infection with poliovirus. This proof-of-principle study demonstrates that a safe, effective polio vaccine can be produced in plants and raises the possibility of using the same approach to tackle other viruses.