Test, test tube - CDC/ Dr. Andrew Chen

FILE: The hands of a Centers for Disease Control (CDC) laboratorian beneath a laminar flow hood, as they were manipulating a calibrated pipette inside a test tube

HELENA, Mont. - An animal in Madison County has been confirmed positive for brucellosis.

The Department of Livestock said it received notice of the animal from a herd within Montana’s brucellosis Designated Surveillance Area (DSA) on Jan. 5.

The positive animal tested as a ‘suspect’ on a whole herd test conducted in December 2021.

An infection was confirmed after tissues were collected and samples were forwarded to the National Veterinary Services Laboratories in Ames, Iowa

At this time the ranch is under quarantine, and an epidemiological investigation has begun.

The positive animal tested negative the prior year, which allows the Department to reduce the scope of the disease investigation.

“A high rate of testing, much of it voluntary, is the primary reason we continue to find affected herds rapidly,” said State Veterinarian Dr. Marty Zaluski. “A robust testing program minimizes the impact to that operation and protects our state and trading partners,” Dr. Zaluski said and commended Montana DSA producers for their high rate of compliance with brucellosis testing regulations.

The source of the infection in the Madison County herd has not yet been determined.

According to the Department of Livestock, this is the 11th brucellosis affected herd detected since the creation of Montana’s DSA in 2010.

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