North Korea entered a fourth day under COVID-19 lockdown Sunday, reporting 15 deaths and more than 296,000 new cases of “fever” as the impoverished country faces down the growing crisis.

The surge in cases came a day after leader Kim Jong Un said the outbreak was causing a "great upheaval," leaving the country — which has one of the world's worst health care systems — on the brink of disaster.

The state-run Korean Central News Agency reported Sunday that a total of 42 people had died since the start of the outbreak, with 820,620 cases of fever and at least 324,550 receiving treatment. The country’s media has not specified whether the new cases or those who died had tested positive for COVID-19.