How do piglets generally contract salmonellosis?

Piglets generally contract salmonellosis primarily through feco-oral contamination from carrier pigs or rodents. This transmission route is significant because salmonella bacteria can be shed in the feces of infected animals. When piglets come into contact with contaminated environments, such as feces in their living area, they can ingest the bacteria while grooming themselves, exploring their surroundings, or through contaminated feed and water.

Carrier pigs, which may not exhibit symptoms but still harbor the bacteria, can contaminate the living space for piglets. Rodents, acting as reservoirs, can also spread the bacteria in a farming environment. This mode of transmission highlights the importance of biosecurity in preventing the spread of salmonellosis and ensuring the health of the piglet population. The options involving other routes of transmission do not align with the primary infection pathway for piglets in the context of salmonellosis.