At least half a million new COVID-19 cases are reported around the world each day, but North Korea still claims to have zero cases of the virus more than a year after it first enacted its strict, ongoing border lockdown.

According to a new report from the World Health Organization (WHO), North Korea has cumulatively tested 21,663 people for COVID-19 as of March 18, and none of the 43,052 total samples have come up positive for the novel coronavirus.

Of the 753 people North Korea reportedly tested between March 12 to March 18 — the latest-available period of data — 131