Animal health authorities are trying to learn what has killed nearly 200 pigs in three separate provinces.
An unknown number of pigs have died in the provinces of Battambang and Kampong Cham, while nearly 150 have perished in the southern province of Kampot.
Health officials said the disease appears to be bacterial, making an outbreak of H1N1, sometimes called swine flu, unlikely.
On Monday, officials began blood tests of pigs in Kampot, where the latest and most severe outbreak has occurred.
“On Saturday, we started the blood tests on seven pigs,” Kao Phal, director of the animal health department of the Ministry of Agriculture, said Monday. “But unitl now we do not know exactly the disease that happened to the pigs is.”
The animal health department is also appealing to farmers not to transport any pigs from their farms to market for the rest of the month of August, he said.