Final answer:
The prevalence of Mycobacterium Bovis in California cattle is low, making the statement true. The BCG vaccine for tuberculosis, made from M. Bovis, is used in places where TB is more prevalent, not usually in the United States.
Step-by-step explanation:
The statement 'Tuberculosis (Mycobacterium Bovis) is generally not prevalent in California cattle' is True. Mycobacterium Bovis is a type of bacteria that can cause tuberculosis in cattle, but due to diligent testing and management practices, the prevalence of this disease in cattle in California, and in the United States in general, is low. However, there are tuberculosis vaccines, such as the bacillus Calmette-Guérin (BCG) vaccine available for humans that are derived from M. bovis. It's important to note that the BCG vaccine is not commonly used in the United States but is used in other parts of the world where tuberculosis is more prevalent. In such places, a positive reaction in a tuberculin skin test could be due to the BCG vaccine rather than an active tuberculosis infection.