Coronavirus latest news: Blood pressure medication can lower the risk of death from Covid-19 –

 South Korea’s capital has ordered the wearing of masks in both indoor and outdoor public places for the first time, as it battles a surge in coronavirus cases centred in the densely populated metropolitan area.

“If we fail to flatten the curve this week we believe we will be faced with a very important crisis, that the virus will spread to the entire nation,” health ministry official Yoon Tae-ho told a briefing.

The Korea Centres for Disease Control and Prevention (KCDC) reported 266 new cases as of midnight on Sunday, down from 397 a day earlier but another in more than a week of triple-digit daily increases. Overall, South Korea has reported 17,665 coronavirus cases and 309 deaths.

South Korea has been widely praised for its success in tackling the virus, with extensive testing and aggressive contact-tracing, but Yoon said health investigators had been unable to determine the transmission routes of about 20 per cent of the recent cases, raising concerns over so-called silent spreaders.

He called on people to avoid leaving home and to cancel any unnecessary trips out.

The Government has also extended second-tier social-distancing rules, which had been in place in Seoul, to other areas of the country, banning in-person church meetings and closing nightclubs, buffets and cyber cafes.

Health authorities say they are considering imposing the toughest stage 3 social-distancing rules, under which schools and business are urged to close, if the spread of new cases can not be slowed.