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Infectious Diseases

Infectious Diseases. Infectious Disease: A disease caused by organisms- such as bacteria, viruses, fungi or parasite. Many live in and on our bodies. They’re normally harmless or even helpful, but some organisms may cause disease. Pathogens: microorganisms and viruses that cause diseases

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Infectious Diseases

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  1. Infectious Diseases • Infectious Disease: A disease caused by organisms- such as bacteria, viruses, fungi or parasite. Many live in and on our bodies. They’re normally harmless or even helpful, but some organisms may cause disease. • Pathogens: microorganisms and viruses that cause diseases • Enter your body and multiply making you sick • 4 types: • Bacterial • Viral • Fungal • Protozoan

  2. Bacterial • Air, soil, food, in and on the bodies of plants and animals • Some give off toxins or a poison that could grow on the food (food poisoning) • Ex: strep throat

  3. Viral • 100 times smaller than bacteria • A virus can multiply only after entering a living cell • Ex: common cold

  4. Fungal • Yeast, molds, and mushrooms are known as fungi • Grows in warm, dark, moist areas. • Ex: athletes foot

  5. Protozoans • Single-celled organisms that are much larger than bacteria • Can move through fluids to search for food • Ex: Malaria (infects red blood cells causing weakness and nausea)

  6. How Pathogens Are Spread • Infected people • Shaking hands • Indirect contact like coughs or sneezing • Infected Animals • Objects • Doorknobs, eating utensils, towels, cups • Food, Soil, or Water • Salmonella found in poultry and eggs • E. coli found in beef • Drinking water that is contaminated by sewage

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