EESA07H3 Lecture 7: Lecture 7
16 Oct 2017
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Document Summary
Active immunity on first exposure to antigen, body produces antibodies. If enough members of a group are immune, hard to maintain chain of infection: antibody preparation passive immunity (injection of readily. Some form spores: antigen preparation active immunity (symptoms and produces. Lecture 7: infectious disease is host-centered concept. Human body is a habitat and host to many organisms. Associations that harm or bother us are infectious diseases; agents are pathogens. Zoonosis infectious disease transmissible to humans from other animals. Types of pathogens: worms multicellular; parasitic, protozoa unicellular; parasitic, bacteria unicellular; most not parasitic, viruses strand of dna or rna; parasitic. Body"s defense against pathogens: immune system distinguishes self from foreign , vaccination antibodies) prepared antibodies/protected immediately, herd immunity practical protection. Evolution of strategies for managing transmission of disease: segregation of sick or exposed persons infectious agent, sanitation: misguided but beneficial, vaccination to prevent illness, antibiotics to treat illness for bacterial, doesn"t work for viral.
