GENEVA (REUTERS) - The World Health Organisation's chief scientist on Monday (July 12) advised against people mixing and matching Covid-19 vaccines from different manufacturers, calling it a "dangerous trend" since there was little data available about the health impact.

       "It's a little bit of a dangerous trend here. We are in a data-free, evidence-free zone as far as mix and match," Soumya Swaminathan told an online briefing.

       "It will be a chaotic situation in countries if citizens start deciding when and who will be taking a second, a third and a fourth dose."

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