The European Union is adding clauses to contracts with COVID-19 vaccine makers which would allow the bloc to gain access to possible upgraded shots that may offer better protection against variants of the virus.

More contagious mutations are spreading fast in the EU and across the world, with the so-called British variant seen by experts as likely to become prevalent on the continent. In new contracts with vaccine manufacturers, the EU is adding clauses that explicitly cover variants, three EU officials involved in talks with the companies told Reuters. Vaccine makers are testing their shots against variants and are also working on tweaks that could make them more effective against virus mutations.