North Korea has once again reported no cases of COVID-19 in the country after testing an additional 696 people, according to the World Health Organization (WHO), as the country told the U.N. last week that a lack of medicine and health professionals “remain as challenges.”

The DPRK has now collected a total of 66,142 samples from 33,208 people for COVID-19 tests, with all results coming back negative, according to the WHO’s weekly situation report published on Monday. The 696 people tested from July 2-8 included 113 people with flu-like illness or severe acute respiratory infections and 583 health care workers, the WHO report said.