Volunteers sought for coronavirus vaccine study launching at Halton Hospital VOLUNTEERS from Halton and Warrington are being asked to sign up to a new study which could see a new coronavirus vaccine approved for use across the country. The National Institute for Health Research-supported Valneva study will be run at Halton Hospital’s clinical research unit and is open to healthy adults who have not previously had a Covid-19 vaccine. Across the UK, 4,000 participants will be recruited for the study, which will see each participant receive two active vaccine doses administered in a four-week interval. Those enrolled in the study over the age of 30 will be randomised to receive two doses of either the Valneva vaccine or the approved Oxford-AstraZeneca vaccine.