North Korea claims that it has tested an additional 665 people for COVID-19 but discovered no positive cases, according to the World Health Organization (WHO).

The WHO’s weekly situation report, released on Monday, states that the DPRK conducted the latest round of polymerase chain reaction (PCR) tests from Aug. 12-19 on 97 people with flu-like illness or respiratory infections and 568 health care workers.

The country has now tested a cumulative 37,291 people for COVID-19 while collecting 74,308 samples, according to WHO data.

North Korea shares COVID-19 data with the WHO, which republishes the figures. The country’s data cannot