Bacteriology-Non-sporing anaerobic Bacillus

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  1. G+ cocci -peptoccous and peptostreptococcus
  2. G+ bacilli-Eubacterium species,Propionibacterium species,Lactobacillus species and Actinomyces
  3. G- cocci-Veillonella
  4. G-bacilli-Bacteroides fragilis


Q)Enumerate 5 non-sporing anaerobic organisms


  1. Peptococcus- This genus has one species P. niger. It is arranged in pairs/clusters/single.It produces black color on blood agar and produces H2S
  2. Eubacterium species-present as commensals in mouth and intestine .It is rarely pathogenic.
  3. Propionibacterium species- They are skin commensals related to C. diptheriae .Most common species is P. acnes
  4. Lactobacillus pecies- They are saprophytes that ferment milk,cheese,carbohydrate(produce lactic acid from it)
    1. They are a part on normal flora of mouth ,gut and vagina working best at pH lower than 5
    2. In stomach-synthesize biotin,vitB12,vitamin K
    3. In oral cavity- Sucrose present in sweets,etc are fermented by these species to produce acid which dissolve enamel and dental components paving a way for the growth of opportunistic bacteria which cause dental carries.
    4. In vagina-Species of lactobacillus present in vagina is k/a Doderlein’s bacilli.These produce lactic acid and maintains an acidic environment in adult vagina protecting it from various microorganisms.In pre-pubertal and post-menopausal¬†women the amount of lactobacillus in vagina is reduced which predisposes them to various infections.
  5. Bacteroides fragilis-Most common commensals of intestines(colon)
    1. Virulence factors-
      1. Capsular polysaccharide
      2. Lipopolysaccharide
      3. Enterotoxin
    2. Diseases caused-
      1. Pelvic Inflammatory Disease(PID)
      2. Diarrhea
      3. Empyema (foul smelling)
      4. Periotinitis & abscess
      5. Bacteremia
      6. Endocarditis
      7. Pericarditis

Q)What is Vincet’s angina?

A) It is acute gingivostomatitis caracterized by inflamed pharayngeal mucosa covered by grayish membrane that peels easily.It is caused by Leptotrichia buccalis (long thin spindle shaped bacilli with pointed ends which inhabits the oral cavity).

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