SEOUL: Health officials in South Korea on Wednesday approved the country's first domestically developed Covid-19 vaccine for people 18 years or older, adding another public health tool in the fight against a prolonged pandemic.

In clinical trials involving some 4,000 participants in South Korea and five other countries, SK Bioscience's two-dose SKYCovione vaccine appeared to be more effective than the broadly used AstraZeneca shots in building immunity against infections, officials at South Korea's Food and Drug Safety Ministry said.