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Download What is an infectious disease?
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What is an infectious disease? An infectious disease is caused by the presence of a living organism in your body. Pathogen: an organism that causes disease (Germ) Host: organism that the pathogen invades. Contagious: capable of spreading the disease to another person. Susceptible: person who can potentially get the disease. Immune: resistant to the pathogen. Carrier: infected by pathogens but show no symptoms of the disease BUT can pass the disease to others. 4 Kinds of Pathogens 1. 2. 3. 4. Bacteria: Strep throat, Tetanus Viruses: Cold, Flu, HIV Fungi: Athlete’s Foot, Ringworm Protist: Malaria, Dysentery How Pathogens Are Spread Infected People: direct physical contact Soil, Food, and Water: occur naturally ex)Cholera Contaminated Object: towels, rusty nail ex)Tetanus Animals: can be infected with the disease (Rabies) or serve as a vector: organism that can transmit the disease but is not infected (Malaria) Conditions Favorable to Disease 1. 2. 3. 4. Epidemic: widespread outbreak of an infectious disease in which many people are infected at the same time. Overcrowding Lack of Sanitation Climate (Warm, Wet) Contaminated Water Supply