Undiagnosed virus infections could be 27 times higher in South Korea's Daegu city-study

FILE PHOTO: A man and children wearing masks to protect against contracting the coronavirus disease (COVID-19) take a walk at a Han River Park in Seoul, South Korea April 4, 2020. REUTERS/Heo Ran/File Photo

SEOUL (Reuters) - A small South Korean survey of people with no history of COVID-19, but living in a city with the most cases, showed that one in nine had antibodies to the novel coronavirus, indicating the virus may have spread more widely than thought.

The study said based on the survey, roughly 185,290 people could have contracted the virus in Daegu city, which is the country's fourth-largest city with a population of 2.5 million.