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.
Diphtheria â acute infectious disease of the throat and upper respiratory tract caused by the presence of diphtheria bacteria. It can be prevented through immunization. Influenza â also known as the flu. Is an acute, highly contagious viral respiratory infection, spread by respiratory droplets, that occurs most commonly during the colder months. Some strains of influenza can be prevented by annual immunization. . Pertussis â also known as whooping cough. A contagious bacterial infection of the upper respiratory tract that is characterized by a paroxysmal cough. Can be prevented through immunization.