Humans can get RB51 brucellosis from drinking raw milk.

• A. Not enough data
• B. True
• C. False
• D. Only via contact with cattle

Answer: (B)

The risk tested here is that the RB51 vaccine strain can cause brucellosis in humans if they drink unpasteurized milk. RB51 is a live attenuated vaccine used in cattle, and it can be shed in milk. When people consume raw milk from cattle that carry or shed RB51, viable bacteria can be ingested and lead to brucellosis. Pasteurization eliminates Brucella bacteria, so the danger mainly applies to unpasteurized dairy products. That’s why the statement is true.

The other options aren’t fitting because evidence shows transmission can occur through ingestion of raw dairy, not just through contact with cattle, and there is data supporting this risk, so saying there’s not enough data or that it’s false isn’t accurate.