A sixth horse has tested positive for hendra virus in New South Wales, Australia, bringing the national total to 16 confirmed cases since June, according to the Australian Veterinary Association.

"The property has been quarantined, and the infected horse has been euthanized and buried on the property," New South Wales Chief Veterinary Officer Ian Roth said in a press release. "There are two other at-risk horses on the quarantined property, both of which are currently showing no signs of illness."

Roth relayed in the press release that the horse became ill late on Sunday and his condition deteriorated during the night and into Monday.

"A private veterinarian took blood and swabs from the sick horse and sent the sample to New South Wales Department of Primary Industry’s (DPI) Elizabeth Macarthur Agricultural Institute for laboratory analysis. Results confirmed the hendra virus last night," he said in the release