Vaccinated Form of Brucella Causes Illness from Consumption of Raw Milk

While raw milk can be a risk for natural contamination from organisms such as Salmonella and Campylobacter, but there is also a concern from the vaccinated form of Brucella, RB51. RB51 is a weakened strain of Brucella that is given to cows to create immunity. In September, a woman became ill with Brucella after drinking raw milk from a vaccinated cow. "In rare cases, a cow's milk can contain traces of the vaccine. The only way to avoid this risk is by pasteurizing the milk, the CDC says. "

From, "Adverse events in humans associated with accidental exposure to the livestock brucellosis vaccine RB51" (J.Vaccine.2004.02.041)

Brucella spp. are small, non-motile gram-negative coccobacilli known to cause disease in a number of vertebrate species including humans. B. abortus is one of four Brucella species associated with systemic disease in humans. Human brucellosis was once a common public health problem in the United States, but it is now rare with approximately 100 cases reported yearly through national surveillance. Brucellosis in humans is a systemic disease that can manifest with an acute or an insidious onset. Signs and symptoms of the disease include: continued, intermittent, or irregular fever of variable duration; headache; weakness; chills; arthralgia; depression; weight loss; and generalized body aches. The disease can persist for periods ranging from days to years.

CBS News
https://www.cbsnews.com/news/udder-milk-company-raw-contamination-brucella-bacterial-cdc/
Raw milk contaminated with bacteria could make people sick, officials warn
By Sarah G. Miller Livescience.com November 21, 2017, 3:34 PM

If you consumed raw milk in the past six months, you may need antibiotics. "People who bought and drank raw milk from a company called Udder Milk may have been infected with a rare but potentially serious germ called Brucella abortus RB51" and should seek medical care, the Centers for Disease Control and Prevention (CDC) said Tuesday in a statement.