any microbe capable of producing a disease.
- 1. Bacteria: simple, ONE-CELLED microbes with double cell-membrane that protect them from harm; REPRODUCE RAPIDLY.
- **considered as one of the MOST COMMON cause of fatal disease.
- ☆ classified according to:
- A. SHAPE:
- a. cocci -spherical shaped
- b. bacilli -rod-shaped
- c. spirilla -spiral-shaped
- B. NEED OF O2:
- a. aerobic
- b. anaerobic
- C. RESPONSE TO STAINING:
- a. gram (+) or (-)
- b. acid-fast
- D. MOTILITY:
- a. non-motile
- b. motile
- E. TENDENCY TO CAPSULATE:
- a. encapsulated
- b. capsulated
- F. CAPACITY TO FORM SPORES:
- a. spore-forming
- b. nonspore-forming
3. Viruses: smallest known microbes.
- 2. Spirochete: a bacterium with flexible, slender, undulating spiral rods that posses cell wall. Three forms of spirochete:
- a. treponema
- b. leptospira
- c. borilia
They cannot replicate independently of the host's cell;
rather they invade and stimulate the host's cell to participate in the formation of additional viruses.
5. Chlamydiae: smaller than rickettsiae but larger than viruses;
- 4. Rickettsiae: small, gram (-) bacteria-like microbes that can induce life-threatening infections. They require a host's cell for replication (like viruses); transmitted through a bite ARTHROPOD CARRIERS like lice, fleas, ticks.
- *DISEASES: Rocky mountain spotted fever, typhus fever and Q fever.
common cause of infection of the urethra, bladder fallopian tubes and prostate gland. Common: transmitted through sexual contact.
live in organic matter, water, animals and plants; seen almost everywhere on earth. thrive either inside or outside of the boy; may be beneficial or harmful. Fungi are beneficial in manufacturing cheese, yogurt, beer, wine and certain drugs.
7. Protozoa: much larger than bacteria; simplest singled-cell organism.
Parasitic protozoa absorb nutrients from the body of the host.
8. Parasites: live on or inside other organisms (called "host") at the expense of those organisms.
They don't kill the host,
but take only the nutrients they need.