Thailand yesterday defended mixing two different COVID-19 vaccines to battle a surge in infections, after the WHO’s top scientist warned it was a “dangerous trend” not backed by evidence.
The kingdom is struggling to contain its latest outbreak fueled by the highly contagious Delta variant of SARS-CoV-2, with cases and deaths skyrocketing and the healthcare system stretched thin.
Authorities said they would mix a first dose of the Chinese-made Sinovac jab with a second dose of AstraZeneca to try and achieve a “booster” effect in six weeks instead of 12.
Thailand’s chief virologist, Yong Poovorawan, said this would be possible by combining an inactivated virus vaccine — Sinovac — with a viral vector vaccine such as AstraZeneca.
“We can’t wait 12 weeks [for a booster effect] in this outbreak where the disease is spreading fast,” he said. “But in the future, if there are better, improved vaccines... we will find a better way to manage the situation.”
His comments come a day after WHO chief scientist Soumya Swaminathan called the strategy a “dangerous trend.”
“We are in a bit of a data-free, evidence-free zone as far as ‘mix-and-match,’” she said.
Thailand has reported more than 353,700 COVID-19 cases and 2,847 deaths — the bulk of them detected since the latest wave started in April from an upscale Bangkok nightlife district.
Healthcare workers were the first in line to receive Sinovac, but authorities on Sunday said that nearly 900 medical staff most of them vaccinated with that shot — got COVID-19.
They will now also get an AstraZeneca or Pfizer-BioNTech booster shot, authorities said.
Virus hotspot Bangkok and nine other hard-hit provinces are now under tougher restrictions that include a nighttime curfew.
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