The World Well being Group’s chief scientist on Monday suggested in opposition to folks mixing and matching COVID-19 vaccines from completely different producers, calling it a “harmful pattern” since extra information is required in regards to the well being affect.
“It’s slightly little bit of a harmful pattern right here,” Soumya Swaminathan advised a web based briefing. “It will likely be a chaotic state of affairs in international locations if residents begin deciding when and who will probably be taking a second, a 3rd and a fourth dose.”
Swaminathan referred to as mixing a “data-free zone” on Monday however the WHO clarified on Tuesday that some information was out there and extra was anticipated.
Its Strategic Advisory Group of Specialists on vaccines in June stated the Pfizer vaccine may very well be used as a second dose after an preliminary dose of AstraZeneca, if the latter is just not out there.
The outcomes of an additional scientific trial led by the College of Oxford that can have a look at mixing AstraZeneca and Pfizer in addition to Moderna and Novovax vaccines is underway.
“Knowledge from combine and match research of various vaccines are awaited – immunogenicity and security each must be evaluated,” the WHO stated in emailed feedback.
It ought to be public well being companies who make selections, primarily based on out there information, and never people, the WHO added.