What is the primary vector for Brucellosis transmission to humans?

Brucellosis is primarily transmitted to humans through direct contact with infected livestock. This transmission occurs when a person handles infected animals or their bodily fluids, such as blood, milk, or placenta. Livestock, particularly cattle, sheep, goats, and pigs, are often harboring the Brucella bacteria, and humans can contract the disease when they come into contact with these infected animals or their products without appropriate protective measures.

The significance of this route of transmission is highlighted in agricultural and rural settings where individuals may work closely with livestock, thereby increasing the risk of exposure. It is crucial for those in such environments to adhere to stringent hygiene practices and protective clothing to mitigate the risk of transmission.

While other options mention potential sources of exposure, they do not represent the primary vector for brucellosis. Contaminated water could be a less common source, and feral dogs and cats are not main transmitters of the disease in humans. Airborne spores are irrelevant in the context of brucellosis, as the bacteria are not transmitted through airborne routes. Thus, the direct contact with infected livestock stands out as the primary and most significant vector for brucellosis transmission to humans.