HLSC 1F90 Lecture Notes - Lecture 7: Helminths, Safe Sex, Myalgia
27 Jan 2018
School
Department
Course
Professor
Document Summary
Infectious agent instead of "microorganism: 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 (internally) Immune system: phase 1: viruses invade the body through a break in the skin or another portal of entry. They take over body cells in order to replicate: phase 2: helper t cells trigger the production of killer t cells and b cells, phase 3: killer t cells and natural killer cells destroy infected body cells. B cells produce antibodies that bind to viruses and mark them for destruction by macrophages: phase 4: when the danger 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 invasions by the virus. Immunity: adaptive immunity, natural, passive (maternal, active (infection, artificial, passive (antibody transfer, active (immunization)
