Title: Classes of Microorganisms
1- Classes of Microorganisms
2Classes 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)
3Classes of Microorganisms
- Aerobic
- requires oxygen to live
- Anaerobic
- does not require oxygen to live
4Classes of Microorganisms
- 6 classes of microorganisms
- Bacteria
- Protozoa
- Fungi
- Rickettsiae
- Viruses
- Helminths
5Classes 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
6Classes of Microorganisms
- Bacteria
- Cocci-
- round in shape
- diplococci
- streptococci
- staphylococci
Streptococci
Staphylococcal clusters
7Classes of Microorganisms
- Bacteria
- Bacilli
- rod shape
- single
- pairs
- chains
- may have flagella
- may form spores
- difficult to treat
8Classes of Microorganisms
- Bacteria
- Spirilla
- spiral or corkscrew shape
- vibrio
- spirochete
Treponema pallidum
Cholera
9Classes of Microorganisms
- Bacteria
- Some bacteria develop resistance to antibiotics
- Very difficult to cure
- Methicillin-resistant Staphylococcus (MRSA)
- Multidrug-resistant Staphylococcus (MDSA)
10Classes of Microorganisms
- Protozoa
- One celled, animal-like organism
- Contain a nucleus and other defined organelles
11Classes 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
12Classes of Microorganisms
13Classes 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
14Classes 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
15Classes 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
16Classes of Microorganisms
- Bacteria
- Protozoa
- Fungi
- Rickettsiae
- Viruses
- Helminths