Thailand health officials have reported two cases of Zika virus in the northern city of Chiang Mai, according to the Bangkok Post today. The two patients, a boy and a girl, both aged 13 years, tested positive for the virus Monday and are now recovering.

Aedes aegypti/CDC
Aedes aegypti/CDC

They tested positive upon return from Phetchabun province.

The village where they lived was declared a disease control area which will remain in effect for 28 days. “Over the next 14 days, we will seriously eradicate mosquito-breeding grounds and spray the area with mosquito-killing agents,” mayor of Tambon Sai Sai Luang Municipality Natee Damrong said yesterday.

Zika virus was first discovered in Thailand in 2012, infects about 5 patients each year.