Double dose of Sinovac ‘up to 91% effectiveness’ against the Alpha strain


THALANDE: Double doses of Sinovac vaccine are 71% to 91% effective in preventing Alpha strain (UK) COVID-19 infection, according to results announced by the Department of Public Health yesterday (June 28) .

Residents of Nonthaburi who signed up for a COVID-19 vaccine through the Non Prom (“Nonthaburi Ready”) platform receive their vaccine last Sunday (June 27). Photo: Apichit Jinakul.

The results were presented by the National Communicable Disease Committee and the National Vaccine Committee, said Permanent Secretary of Public Health Kiattiphum Wongrajit.

The results were taken from a study conducted to determine the effectiveness of Sinovac, also known as the CoronaVac vaccine, between April and May, when the Alpha variant of the virus was most prevalent in the country.

The study confirmed that double doses of Sinovac vaccine were effective in reducing Alpha variant infection from 71% to 91%. The study subjects belonged to high-risk groups in Phuket, Samut Sakhon and Chiang Rai as well as public health workers.

The vaccine was 90.7% effective in people from Phuket, 90.5% from Samut Sakhon and 82.8% from people from Chiang Rai. The results also showed that the vaccine was effective in reducing infections among public health workers by 70.9%.

No one died as a result of inoculating two doses of Sinovac.

Dr Kiattiphum said data was being collected for a similar study on the efficacy of the vaccine against the rapidly spreading Delta (Indian) strain.

According to a real-world study, the Sinovac jab was also found to be 95% effective in preventing severe symptoms or even death in people who contracted COVID-19 after being vaccinated.

The other vaccine deployed in large numbers is manufactured by AstraZeneca, an Anglo-Swedish multinational pharmaceutical and biotechnology company. The government plans to administer around 10 million doses of the COVID-19 vaccine next month.


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