COVID-19 vaccines for weeks amid safety concerns over the AstraZeneca shot.On Monday, the chief scientist at the World Health Organization (WHO) cautioned against that approach, calling it “a dangerous trend” for a subsequent dose as well as booster shots saying there was insufficient evidence available about the health impact.
Mixing COVID-19 vaccines a ‘dangerous trend,’ WHO chief scientist says “There is limited data on mix and match,” said Soumya Swaminathan during a virtual news conference.“Maybe it will be a very good approach but at the moment we only have data on the Oxford-AstraZeneca vaccine followed by Pfizer,” she added.However, her concerns stemmed from individuals deciding to mix vaccines or take additional doses on their.