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At least 10 of the 26 doctors in Indonesia who died from Covid-19 this month had received both doses of the vaccine developed by Sinovac Biotech Ltd., a medical association said, raising questions about the Chinese-made shot that is being used in many parts of the developing world.

The Indonesian Medical Association’s Covid-19 mitigation (giảm thiểu) group is still working to verify (kiểm chứng) the vaccination status of the 16 others, said Dr. Adib Khumaidi, who leads the group. According to the group’s latest figures, over a five-month period, at least 20 doctors who were fully inoculated with Sinovac’s vaccine died from Covid-19, accounting for more than a fifth of total fatalities among doctors during that time span.

The toll could rise further in the coming weeks as the country battles a surge (dâng, trào lên) in infections (nhiễm) and hospitals across the archipelago (quần đảo) fill up.

Epidemiologists (nhà dịch tễ học) say the deaths need to be properly investigated (điều tra) to determine whether factors (xác định yếu tố) such as poor hospital care or chronic underlying illnesses played a major role.