More than 350 Indonesian doctors have contracted COVID-19 despite being vaccinated with Sinovac and dozens have been hospitalised, officials said, as concerns rise about the efficacy of some vaccines against more virulent virus strains, Reuters reports.

Most of the doctors were asymptomatic and self-isolating at home, said Badai Ismoyo, head of the Kudus district health office in Central Java, but dozens were in hospital with high fevers and declining oxygen saturation levels.

Kudus is battling an outbreak believed to be driven by the more transmissible Delta variant which has pushed bed occupancy rates above 90% in the district.

Almost all have received the COVID-19 vaccine developed by Chinese biopharmaceutical company Sinovac, according to the Indonesian Medical Association (IDI).

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