The locally produced Covid-19 vaccine by Medigen Vaccine Biologics was rolled out last week, with President Tsai Ing-wen receiving her first shot.
Chen told CNBC that it was not possible to conduct a "traditional efficacy trial" because Taiwan's infection rate is "so low." Such a trial typically involves a comparison between a vaccinated group and a control group that does not receive the vaccine, he explained.
Instead, Medigen used a method called "immunobridging" to infer the vaccine's protection level based on the immune responses in trial participants.Medigen said in July that it receivedTaiwan's inoculation program got off to a slow start as it — like many governments globally — faced challenges in securing Covid vaccine deliveries.
The island, with a population of roughly 24 million, has received more than 10 million doses of Moderna and AstraZeneca vaccines, according to public data compiled by Unicef. That includes nearly 6 million doses donated by the U.S. and Japan, the data showed.
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