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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: • Koch’s 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, SIDS