HLTB21H3 Lecture Notes - Homo Erectus, Herd Immunity, Rodent
2 Dec 2012
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Document Summary
Grow, live, feed on a host but does not contribute to host survival. Cannot survive or replicate on their own (live on a host inside the body) More offspring the greater infection can spread. Microparasite(virus): a collection of genetic material encased in a protein shell, and can only be seen with an electron microscope (virus is smaller than bacteria) and can only reproduce within their hosts. Macroparasite: composed of many cells; cycles through a transmission stage (eggs and larvae) which pass into the external environment (can be seen using naked eye) ex. Transmission, the movement of the parasite from one host to another. Incubation period interval required for development of a disease (activity occurring but don"t see symptoms yet) Latent period seemingly inactive period between exposure to an infection and illness (no activity occur, dormant stage) Parasite virulence the capacity of a parasite to cause disease (how much harm it can cause to a host)
