Reservoir: An animal, person, plant, soil, or other substance in which an infectious agent normally abides.
Peritoneum: The membranes lining the abdominal wall and intestines. The space between those lining the abdominal wall and those lining the intestines is the peritoneal cavity.
Pleural cavity: The space between the lining of the chest wall and the lining of the lungs.
Vector: An organism that transmits a disease or parasite from one animal or plant to another.