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Unformatted text preview: HLTH 130- Chapter 9: The Conquest of Infectious Diseases: Infectious were major killers but were conquered largely by: purification of water, proper disposal of sewage, pasteurization of milk, and immunization Infectious Agents: Kochs postulates: 1. Organism must be present in every case of the disease 2. The organism must be isolate and grown in the laboratory 3. When injected with lab-grown culture, susceptible test animals must develop the disease and 4. The organism must be isolated from the newly infected animals and the process repeated. Found that tubercle bacilli were the cause of tuberculosis Bacteria are living, single celled organisms that can grow and reproduce outside the body Human diseases can also be caused by protozoa, or single-celled animals that can live as parasites in the human body Means of Transmission: Directly from one person to another or indirectly by way of water, food, or vectors such as insects and animals. Air on aerosols, water droplets produced when an infected person coughs or sneezes Objects touched by an infected person (doorknob, etc) Fecal-oral route fecal matter from an infected person reaches the...
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- Spring '08
- Infectious Disease