The World Health Organisation’s chief scientist Soumya Swaminathan has called on the public to avoid mixing and matching COVID-19 vaccines from different manufacturers to prevent unknown health issues.

During an online briefing on Monday, the WHO scientist stated that it is a “dangerous trend” trend to mix two or more COVID-19 vaccines, noting that there is not enough data available about the health impact of the trend.

“It is a little bit of a dangerous trend here. We are in a data-free, evidence-free zone as far as to mix and match,” Soumya Swaminathan said.

She noted that it will be a chaotic situation across regions if citizens start to mix their vaccine doses.

“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 added.