When the switch of a flashlight is pushed into the ON position, it makes contact between two contact strips, which begin a flow of electricity, powered from the battery. The batteries are connected in such a way that electricity (flow of electrons) runs between the positive and negative electrodes of the battery.
Shigella infection (shigellosis) is an intestinal disease caused by a family of bacteria known as shigella. The main sign of shigella infection is diarrhea, which often is bloody. Shigella can be passed through direct contact with the bacteria in the stool.
Chapter 10 - Infectious Diseases 217 Chapter 10 - Lesson 1 Causes of Infectious Diseases Introduction Infectious diseases are caused by exposure to living organisms not normally present in the animal.ungal diseases may also be called mycosis or mycotic diseases. Some fungi infect the superficial layer of skin (such as the ringworm fun-gus), and others invade various body systems (such as the aspergillus fungus). Parasites Common parasitic diseases of animals are caused by arthropods, worms, and protozoa.