HLTB21H3 Lecture : First Lecture detailed notes
Document Summary
First lecture: what"s the impact of diseases on human societies, aim to understand why diseases occur, humans are effected and what humans do effects the spread of diseases, why is it so hard to control diseases. Introduction to disease (refer to pg 8, 9 in textbook) Incubation period: time period where the parasite is doing something, its replicating so it can cause harm to the host, kind of replication, activity is happening: latent period: inactive period where nothing can be seen, May 10th 2011: e. g. agent-psychosocial, biological, source that cause harm, e. g. environment: air, water, e. g. triad- a person develops severe cramps after drinking water on a cattle farm, host: person, environment: well water, agent: nutrition, Modes of disease transmission: direct: person to person. Indirect: vector, route of transmission, contaminated water or mosquito: malaria: doesn"t move from one person to another directly, mosquito is the vector, indirect transmission. Portal of entry: dermal- through the skin, e. g. fungus.
