EESC1168 Lecture 28: pandemics II 3.31
1 Apr 2017
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Document Summary
Pandemic: an outbreak of disease over a very large area; affecting a large proportion of. Vector-borne transmission - spread by an animal or insect (zika) Fecal-oral transmission - requires ingestion of infected fecal material (cholera) Indirect/droplet/airborne contact - can spread by being near infected people or in some cases touching contaminated surfaces (norwalk virus, sars, measles) Direct contact - requires direct contact between people to spread - the pathogen must be physically transferred (hiv, ebola) Less contagious usually, sexually transmitted often (except ebola - lots of bodily fluid, caretakers can easily get it) That way a disease spreads helps determine ways to fight against it. Our immune systems destroy and remember invaders. The host immune system can fight off an invader. The immune system remembers the disease, so the person cannot be infected. Acquired immunity - the pathogen cannot infect the host, because the immune twice system responds quickly. Antibodies flag invaders, increasing the immune system"s efficiency.
