Pigs are reservoir for –
**Core Concept**
Pigs serve as reservoirs for certain zoonotic pathogens, which are infectious agents transmitted from animals to humans. The concept of a reservoir is crucial in understanding the epidemiology of infectious diseases and the potential for zoonotic transmission.
**Why the Correct Answer is Right**
Pigs are known to be reservoirs for the Trichinella spiralis parasite, which causes trichinosis. This parasitic infection is acquired through the consumption of undercooked or raw meat, particularly pork, that contains encysted larvae of the parasite. The Trichinella spiralis parasite has a complex life cycle involving both vertebrate and invertebrate hosts. In pigs, the parasite undergoes a series of developmental stages, ultimately leading to the formation of cysts in the muscle tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because pigs are not typically associated with the transmission of Brucella abortus, a bacterium that causes brucellosis in cattle.
**Option B:** Incorrect because pigs are not considered reservoirs for Leptospira bacteria, which cause leptospirosis and are primarily transmitted through contact with contaminated water or soil.
**Option C:** Incorrect because pigs are not typically associated with the transmission of Toxoplasma gondii, a parasite that causes toxoplasmosis and is primarily transmitted through the feces of domestic cats.
**Clinical Pearl / High-Yield Fact**
When consuming pork or other pork products, it is essential to ensure that the meat is thoroughly cooked to an internal temperature of at least 145°F (63°C) to prevent the transmission of Trichinella spiralis and other zoonotic pathogens.
**Correct Answer: C. Trichinella spiralis**