WHO warns individuals against mixing and matching Covid vaccines

 AstraZeneca/Oxford Covid-19 coronavirus vaccine

A nurse holds up a vial of the AstraZeneca/Oxford Covid-19 coronavirus vaccine at the Kalayani Watthanakarun Hospital compound in the southern province of Narathiwat on July 9, 2021. PHOTO | MADAREE TOHLALA | AFP 

The World Health Organization's chief scientist has advised individuals against mixing and matching Covid-19 vaccines from different manufacturers, saying such decisions should be left to public health authorities.

"It's a little bit of a dangerous trend here," Soumya Swaminathan told an online briefing on Monday after a question about booster shots. "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."