HLSC 1F90 Lecture 13: TOPIC13. Infectious Diseases
9 Mar 2018
School
Department
Course
Professor
Document Summary
Host: an organism larger than the infectious agent that provides shelter and nutrients, facility of maturation, reproduction and spread. Infection: presence of an infectious agent in the body (internal) Infestation: presence of an infectious agent on the body (external) Disease: a pathological condition of a part, organ, or system of an organism resulting from various causes, such as infection, genetic defect or environmental stress, and characterized by an identifiable group of signs or symptoms. Vector: an arthropod __ usually an insect __ capable of transmitting pathogens that cause infectious diseases. B cells produce antibodies that bind to viruses and mark them for destruction by macrophage: phase 4 - when the damage is over, suppressor t cells halt the immune response. Memory b and t cells are reserved so that a quick response can be mounted for future invasion by this virus. Preventing infection or fighting it when it happens. Remove altered self (eg: damaged or malignant cells)
