BIO 3124 Lecture Notes - Lecture 21: Immune Privilege, Exosphere, Shingles
Document Summary
Host-pathogen relationship: the infectious disease: classi cation of diseases by duration. In the latent time, the immune system usually succeeds in getting rid of the pathogen (see latent period). However, this is not due to the pathogen completely disappearing, it is because the pathogen goes below the critical level, and nds somewhere to hide in an immunologically privileged site (common in viruses). Depending on the conditions (ie. stressed, failed immune system), the pathogen may re-emerge and go right into disease (no incubation period). An example of this occurring is in shingles: classi cation of infectious diseases. Classi cation can be due to: as a function of the site of infection. Local: con ned to a speci c area of the body. Systemic: infection with a generalized distribution in the tissues: as a function of the order or declaration. Secondary: occurs in a person weakened by a primary infection ie. get the u (primary), which results in ammonia (secondary).
