The Food and Veterinary Service told the press that operations at the Druvas Unguri pig farm have been suspended and a zone of quarantine set across the perimeter.
Precise reasons of the outbreak are being investigated.
This is the eight outbreak of the dangerous porcine disease in Latvia this year among domestic pigs. It is understood that all the pigs in the affected farm are to be culled, which is standard practice as the disease is highly contagious.
LETA reports that Latvia's cabinet is to convene in an extraordinary meeting at 8.30 a.m. August 3 to discuss measures over preventing the disease from spreading further.
However, Prime Minister Māris Kučinskis remains on the second week of a two week holiday despite this new crisis and a series of massive wildfires.
Druvas Unguri is a large farm that operated with a turnover of €3.331 million last year, according to the Firmas.lv database. It farmed 1,900 tons of pork last year and 1,886 in 2016.
African Swine Fever has been detected in 666 wild boar this year.