The internal memo documented various opinions. It included a comment from an unnamed official who recommended authorities do not give a booster shot of Pfizer-BioNTech's vaccine to frontline health workers because such a move would be "admitting that the Sinovac vaccine is not effective."
Thailand has administered Sinovac's inactivated virus vaccine to most health workers, and its real-world study showed two doses were 95 percent effective in reducing mortality and severe symptoms. The study showed it was 71 percent to 91 percent effective in stopping infection with the Alpha variant.
The hashtag "Give Pfizer to medical personnel" was trending on Thai Twitter with more than 624,000 tweets.
World Health Organization experts found the Sinovac vaccine was efficacious in preventing COVID-19 in adults under 60, but some quality data on the risk of serious adverse effects was lacking.
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