North Korea has tested an additional 691 people for COVID-19 and found no positive cases, according to the World Health Organization (WHO), after the country’s state media defended its pandemic measures as “realistic and appropriate.”

According to the WHO’s weekly situation report, the DPRK screened 109 people with flu-like illness and severe acute respiratory infections and 582 health workers from Oct. 15-21. The country now says it has conducted polymerase chain reaction tests on a cumulative 43,464 people, while collecting 86,654 samples.

North Korea provides COVID-19 testing data to the WHO, but it is not possible to independently confirm the