BBC News By Rachel Schraer image copyrightGetty Images Prisoners have an elevated risk of dying of Covid and should be prioritised for vaccination, along with prison staff, say researchers from University College London (UCL). The risk is driven both by greater exposure to the virus, and by having generally poorer health to start with. And Covid has meant many prisoners have been living in near-total isolation. The Joint Committee on Vaccination and Immunisation said its current priority list would prevent 99% of Covid deaths. "As the single greatest risk of death from Covid-19 is older age, prioritisation is primarily based on age," Prof Wei Shen Lim, the JCVI's Covid-19 chairman said.