HLTB21H3 Lecture : lecture 1
Document Summary
Environment [ promotes exposure] agent [ biological, physical, chemical, psychosocial; rate of. Parasites: organism that grows, feeds, and is sheltered on or in a different organism (host) and does not contribute to the survival of its host. Virus: ultimate micro-parasite - smaller than bacteria; neither cells nor organisms; can only reproduce within their host. Macroparasites: composed of many cells; does not multiply in a host, instead it lives certain cycles/stages through transmission stages - eggs and larvae which passes into the external environment. Transmission: movement from a parasite from host or host (direct or indirect) I ncubation period: interval of time required for a development of a disease. Latent period: seemingly inactive period between exposure to an infection and subsequent illness. Parasite virulence: capacity of a parasite to cause disease (ability) Zoonotic infections: animal infections that can be transmitted to humans. Main factors that influence the occurrence of a disease -
