In this #AskTheAgenda special, Stephen Cole chooses some of the most prominent queries and concerns from viewers - such as whether the vaccines work on new variants, and how long immunity lasts - and gets the answers from Jerome Kim, Director General of the International Vaccine Institute.
When asked if doses of vaccines can be interchangeable - for example, the first dose of a Pfizer vaccine and the second being from an Oxford-Astrazeneca batch - Dr Kim told Stephen Cole only in exceptional circumstances should this be considered:
“Could it work? In theory, yes. We would like to avoid it. A single dose of vaccine actually does probably work. We don't know for how long, but looking at the data, 10 days after the first vaccination we start to see a drop off in infection. For now, I think that most guidance is to try to match the vaccines. If you're in a situation where you absolutely cannot, then it might be acceptable to use a different one.”
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