Researchers urge other countries to test their animals after thousands of minks are infected with the virus.
In the Netherlands, thousands of minks are being culled after they infected several farmers with the coronavirus.
The Dutch government says this is to prevent farms from becoming long-term reservoirs of COVID-19.
Researchers are urging other countries such as Denmark and Spain to also test their animals.
Al Jazeera’s Step Vaessen reports from Deurne, southern Netherlands.