Hundreds of people are being recruited for UK trials to see if different Covid-19 vaccines can be used for first and second doses.
The study will first look at whether it's effective and safe to combine the Pfizer jab with a later Oxford/AstraZeneca one, or vice-versa.
Researchers hope this will make the global rollout more flexible.
Benji Hyer has the details from London.
IN: Official guidance
OUT: SOC
DUR: 45 secs (wrap with SOTs)
http://www.fsnradionews.com/feeds/0204vaccine-bh-generic.mp3