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1. Characteristics ‫ت‬ ‫خصوصیا‬ Genus Representative Diseases
A: Free Living
1: Gram positive
a. Cocci Staphylococcus Pneumonia, pharyngitis,
cellulitis
Streptococcus Abscess of skin and other
organs
b. Spore forming rods
1: Aerobic Bacillus Anthra
2: Anaerobic Clostridium Tetanus, gas gangrene,
botulism
c. Non-spore-forming rods
(1) Nonfilamentous Corynebacterium Diphtheria
(2) Filamentous Actinomyces Actinomycosis
Nocardia Nocardiosis
2. Gram-negative
a.Cocci Neisseria Gonorrhea, meningitis
b. Rods
(1)Facultative
(a) Straight
(i)Enteric and related
organisms
Escherichia Urinary tract infection,
diarrhea

2. Klebsiella Pneumonia, urinary tract
infection
Salmonella
Shigella
Enterocolitis, typhoid fever
Enterocolitis
Proteus Urinary tract infection
(ii) Zoonotic Organism Brucella Brucellosis
Yersinia Plague
(c ) Curved Vibrio Cholera
Helicobacter Gastritis, peptic ulcer
(2) Aerobic Pseudomonas Pneumonia, urinary tract
infection
(3) Anaerobic Bacteroides Peritonitis
3. Acid-fast Mycobacterium Tuberculosis, leprosy
II. Flexible, thin-walled cells Treponema Syphilis
Borrelia
Leptospira
III. Wall-less cells Mycoplasma Pneumonia