Britain will allow people to be given shots of different Covid-19 vaccines on rare occasions, despite a lack of evidence about the extent of immunity offered by mixing doses. In a departure from other strategies globally, the government said people could be given a mix-and-match of two Covid-19 shots, for example if the same vaccine dose was out of stock, according to guidelines published on New Year's Eve.from World News Headlines, Latest International News, World Breaking News - Times of India https://ift.tt/2MmdWGl
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