Mix match for vaccines new trend as Thailand joins bandwagon despite cautionary advice from WHO

WORLD – Mix and match for vaccines is becoming a global trend as various countries are embracing the use of two different vaccines for their citizens.

In Thailand, AstraZeneca vaccines are going to be used as a second dose for those who received Sinovac shots as the first dose in a move that is set to improve protection against COVID-19.

The move is the first publicly announced mix-and-match of a Chinese vaccine and a Western-developed shot, as a new preliminary Thai study raised doubts about the long-term protection of the Sinovac vaccine.

There have been no studies specifically on mixing Sinovac and AstraZeneca released, but a growing number of nations are looking at mix-and-match of different vaccines or giving a third booster dose amid concerns new and more contagious variants may escape approved vaccines.

The announcement came after Thailand’s health ministry said 618 medical workers out of 677,348 personnel who got two Sinovac doses became infected from April to July with one nurse succumbing to the disease.

Indonesia has also reported breakthrough infections among medical workers who are fully inoculated with the Sinovac vaccine.

Based on a preliminary Thai study of 700 medical staff, the Sinovac was found to protect a patient for the first 60 days at an efficacy rate ranging between 60% -70% with the second jab and would decrease to half the efficacy rate after 40 days.

Despite the growing rate of mix and match for vaccines, the WHO is still cautioning countries against the use of different vaccines for its population.

World Health organization is still wary of this new idea owing to the fact that there is no sufficient data to help determine whether it will work or not.

It added that the use of two different vaccines could have side effects unknown to us and until there is credible sufficient data to use, we should avoid mixing vaccines.

“It’s a little bit of a dangerous trend here. We are in a data-free, evidence-free zone,” WHO Chief Scientist Soumya Swaminathan said in the online COVID-19 briefing. She said studies on the topic are currently being carried out.

WHO Director-General Tedros Adhanom Ghebreyesus and six other WHO directors and experts were also present at the COVID-19 briefing.

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