ANTC67H3 Lecture Notes - Lecture 9: Post-Exposure Prophylaxis, Public Health, Herd Immunity

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Chain of infecions: host vector/ vehicle agent environment: host: human or animal that microorganism and fax. Serves as the place for the infecious agent to grow and mulipky. Pathogenicity: ability to produce disease (raio of # people with clinical disease to # people exposed) Infecive dose: amount required to cause infecion in suscepible person. Source of infecion: person/object from which host acquires agent: environment: anything external to host, afects all stages of chain of infecion. Socioeconomic factors: vector: insect or animal transport from infected individual to suscepible individual, vehicle: the object or element of the environment that transports microorganism from infected individual to suscepible individual. Disease transmited from person to person by direct contact (physical transfer of microorganisms through sexual contact or contact with oral secreion. Disease cannot survive for long when away from host. Disease is transmited by common vehicle (contaminated surface or objects) or by a vector (mosquito) or is airborne.

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