Alarm over patients 'mixing and matching' vax themselves
The WHO's chief scientist is advising people not to take matters into their own hands by mixing and matching COVID-19 vaccines from different manufacturers.
Dr Soumya Swaminathan told an online briefing on Monday it was a "dangerous trend".
"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," she said.
It should be public health agencies who make decisions, based on available data, and not