Classes of Microorganisms

1. Viruses Pathogenic Aerobic Classes of Microorganisms • Bacteria • Rickettsiae • Protozoa • Fungi Non-pathogenic Anaerobic • Helminths 2.02 Understand infection control procedures

2. Remember What may be non-pathogenic in one body system could be pathogenic in another Example: E. coli 2.02 Understand infection control procedures

3. Classes of Microorganisms • Non-pathogenic • normal • do not produce disease • beneficial • Pathogenic • cause infection and disease 2.02 Understand infection control procedures

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

5. 6 Classes of Microorganisms • Bacteria Protozoa • Fungi Rickettsiae • Viruses Helminths 2.02 Understand infection control procedures

6. Bacteria • Often considered the causes of disease • Classified by shape and arrangement • Treated with antibiotics 2.02 Understand infection control procedures

7. 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 2.02 Understand infection control procedures

8. Bacteria Cocci Bacilli Spirilla

9. Bacteria Cocci- • round in shape • diplococci • streptococci • staphylococci Streptococci Staphylococcal clusters 2.02 Understand infection control procedures

10. Bacteria Bacilli • rod shape • single • pairs • chains • may have flagella -aids in movement • may form spores • difficult to treat 2.02 Understand infection control procedures

11. Bacteria Spirilla • spiral or corkscrew shape • vibrio - spirochete Cholera Treponema pallidum 2.02 Understand infection control procedures

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

13. Protozoa • One celled, animal-like organism • Contain a nucleus and other defined organelles • Example: Malaria, amebic dysentery • Malaria invades RBC and causes them to rupture 2.02 Understand infection control procedures

14. Fungi • enjoys 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

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

16. 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 • Rocky Mountain Spotted Fever 2.02 Understand infection control procedures

17. Viruses • small infectious agent • requires a host for survival • Seen with electron microscope • over 5,000 types • can combine in multiple ways to produce a wide range of diseases 2.02 Understand infection control procedures

18. Viruses • produce immune response in humans • treated with antiviral drugs • Common cold, measles, mumps, chicken pox, AIDS 2.02 Understand infection control procedures

19. Helminths • Parasitic worm-like organisms • Live inside the host • Feed off their host • Disrupt nutrient absorption 2.02 Understand infection control procedures

20. Helminths • Lead to weakness • Excrete toxins making host susceptible to other diseases • Approximately 30 billion people globally are infected 2.02 Understand infection control procedures

21. Classes of Microorganisms Any Questions? 2.02 Understand infection control procedures