Classes of Microorganisms

1. Classes of Microorganisms 2.02 Understand infection control procedures

2. Classes of Microorganisms • Non-pathogenic • normal • do not produce disease • beneficial • Pathogenic • cause infection and disease • May be non-pathogenic in one body system, pathogenic in another (E. coli) 2.02 Understand infection control procedures

3. Classes of Microorganisms • Aerobic • requires oxygen to live • Anaerobic • does not require oxygen to live 2.02 Understand infection control procedures

4. Classes of Microorganisms • 6 classes of microorganisms • Bacteria • Protozoa • Fungi • Rickettsiae • Viruses • Helminths 2.02 Understand infection control procedures

5. Classes of Microorganisms • Bacteria • Often considered the causes of disease • Certain bacteria • produce antibiotics • live in the body without problems • live on the roots of certain plants, converting nitrogen into a usable form • help break down dead organic matter • Classified by shape and arrangement • Treated with antibiotics 2.02 Understand infection control procedures

6. Classes of Microorganisms • Bacteria • Cocci- • round in shape • diplococci • streptococci • staphylococci Streptococci Staphylococcal clusters 2.02 Understand infection control procedures

7. Classes of Microorganisms • Bacteria • Bacilli • rod shape • single • pairs • chains • may have flagella • may form spores • difficult to treat 2.02 Understand infection control procedures

8. Classes of Microorganisms • Bacteria • Spirilla • spiral or corkscrew shape • vibrio - spirochete Treponema pallidum Cholera 2.02 Understand infection control procedures

9. Classes of Microorganisms • Bacteria • Some bacteria develop resistance to antibiotics • Very difficult to cure • Methicillin-resistant Staphylococcus (MRSA) • Multidrug-resistant Staphylococcus (MDSA) 2.02 Understand infection control procedures

10. Classes of Microorganisms • Protozoa • One celled, animal-like organism • Contain a nucleus and other defined organelles 2.02 Understand infection control procedures

11. Classes of Microorganisms • Fungi • organisms that usually enjoy a symbiotic, but sometimes parasitic relationship with their host • provide numerous drugs and foods • provide bubbles in bread, champagne, and beer • cause a number of plant and animal diseases • fungal diseases are very difficult to treat 2.02 Understand infection control procedures

12. Classes of Microorganisms • Fungi 2.02 Understand infection control procedures

13. Classes of Microorganisms • Rickettsiae • rod-shaped, parasitic bacteria • live in the tissues of ticks, fleas, and lice • transmitted to humans through bites • invade the new host from within 2.02 Understand infection control procedures

14. Classes of Microorganisms • Viruses • small, infectious agent • requires a host for survival • over 5,000 types • can combine in multiple ways to produce a wide range of diseases • produce immune response in humans • treated with antiviral drugs 2.02 Understand infection control procedures

15. Classes of Microorganisms • Helminths • Parasitic worm-like organisms • Live inside the host • Feed off their host • Disrupt nutrient absorption • Lead to weakness • Excrete toxins making host susceptible to other diseases • Approximately 30 billion people globally are infected 2.02 Understand infection control procedures

16. Classes of Microorganisms • Bacteria • Protozoa • Fungi • Rickettsiae • Viruses • Helminths 2.02 Understand infection control procedures