N 325 Lecture Notes - Lecture 1: Immunodeficiency, Protozoa, Microorganism
Document Summary
Infection: the invasion of a susceptible host by pathogens or microorganisms, resulting in disease. Colonization: occurs when a microorganism invades the host but does not cause infection. Communicable disease: infectious process transmitted from one person to another. If pathogens multiply and cause clinical signs and symptoms, the infection is symptomatic. If clinical signs and symptoms are not present, the illness is asymptomatic. Some infections have low/no risk of transmission, and some have high ones. Virulence: the ability to produce a disease. Aerobic bacteria: require oxygen for survival and for multiplication sufficient to cause. Anaerobic bacteria: thrive where little or no free oxygen is available. Bacteriostasis: prevention of growth and reproduction of bacteria. Infectious agent: bacteria, spores, viruses, fungi, protozoa. Reservoir: hosts, human hosts, symptomatic, carriers, animals. Conditions for thriving: environment, food, oxygen, water: most organisms require this to grow, temp, ph light, tend to like warm, dark, and moist. Mode of transmission: contact, direct/indirect, droplet.
