Leslie A. Tengelsen PhD DVM


Mad Cow Disease

Mad cow disease (bovine spongiform encephalopathy, or BSE) is a degenerative, usually fatal disease that affects the central nervous system of cattle, sheep, and goats. While humans cannot get mad cow disease, in rare cases they may get a human form called variant Creutzfeldt-Jakob disease (vCJD) if they eat nerve…

West Nile Virus Transmission Cycle

Illustration copyright 2005. Adapted from the U.S. Centers for Disease Control and Prevention. Available online: http://www.cdc.gov Mosquitoes become infected with West Nile virus when they bite infected birds. And then they may transmit the virus to humans and animals when they bite to take blood.

Amebiasis

Amebiasis (amebic dysentery) is a parasitic infection of the large intestine and sometimes the liver. More common in developing countries, the parasite is spread by flies, cockroaches, and direct contact with hands, food, or drinking water contaminated with feces from an infected person. Sometimes no symptoms are…

Plague

Plague is a potentially deadly disease caused by a bacterium ( Yersinia pestis ) that comes from rodents. Fleas on rodents can also spread this disease. There are three ways plague can make people ill: Pneumonic plague affects the lungs. An infected person can spread the disease by sneezing, coughing, or otherwise…

Hookworm Disease

Hookworm disease is caused by a parasite that infects the intestines. Hookworms are usually found only in the tropics. Hookworms enter the body by burrowing through the skin of the feet or by being eaten. Once in the body, hookworms attach to the intestinal wall and suck blood, which, in severe cases, leads to anemia. A…