Trials are looking into mixing different Covid-19 vaccines to boost immunity - but that doesn't mean the second dose of your jab will be different from the first one.
Good Morning Britain's Dr Hilary Jones explained that the new Government back trials aim to find out if immunity can be improved by 'mix and matching' Covid-19 vaccines, but he reassured viewers that their doses will come from the same vaccine.
"Remember that everybody who has currently had their first dose of one vaccine will be offered a second dose of exactly the same vaccine in 12 weeks, that won't change," Dr Hilary said.
"What the trial is looking at is whether you can mix a different vaccine for the second dose.
"About 820 people have been recruited at the trial which will be conducted at Oxford.
"And what we want to see is whether the immune response that is stimulated by the first dose, can be enhanced by a second dose of a different vaccine.
"They will both be attacking the spike protein on the virus, but in slightly different ways."
Dr Hilary added: "This could enhance immunity, or it could reduce immunity, that's what we need to find out during the trial.
"If it improves immunity which we hope it will, that increases the flexibility of vaccination campaigns all over the world where you have got a supply problem with vaccines, we need as many as we can.
"If we can mix and match them and get better immunity, that is a great thing for the whole world."
