A cat shelter in South Korea has been put under quarantine after two of the felines tested positive for H5N1 bird flu in the capital city of Seoul.

The South Korean Ministry of Agriculture, Food and Rural Affairs said in a statement on Tuesday that this was the first time that this bird flu had been detected in cats in the country since 2016, as reported by Reuters.

The positive-testing cats were two of 38 cats that had recently died at the same shelter. Workers at the shelter are being monitored, although none are exhibiting symptoms of the condition.