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.
Two of the most commonly used words in classifying disease are contagious disease and infectious disease. Let us differentiate one word from the other. Infectious disease is said to be the mother word of the terms such as contagious disease, communicable disease, and transmissible disease. Generally, infectious diseases are defined as the ability of a disease to enter a host, transmit the disease, and infect that person. An infectious disease can be sub-classified as contagious or non-contagious.