WHO warns against mixing and matching COVID vaccines | Reuters

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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https://www.reuters.com/business/healthcare-pharmaceuticals/who-warns-against-mixing-matching-covid-vaccines-2021-07-12/?taid=60ec7e7ab9a11500017c253c