World Health Organization (WHO) Chief Scientist Soumya Swaminathan attends a press conference organised by the Geneva Association of United Nations Correspondents (ACANU) amid the COVID-19 outbreak, caused by the novel coronavirus, at the WHO headquarters in Geneva Switzerland July 3, 2020. Fabrice Coffrini/Pool via REUTERS
GENEVA, July 12 (Reuters) - The World Health Organization's chief scientist on Monday 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."
Reporting by Emma Farge and John Revill; Editing by Hugh Lawson
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