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Flashcards in Micro 3- atypical bacteria Deck (5)
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1

mycoplasmatales

-lack a cell wall, pleomorphic
-small, 200-250nm, can pass through filters
-may demonstrate filamentous growth
-colonies have a "fried egG" apperance
-mycoplasma pneumoniae causes mild pneumonia

2

clamydiae

-gram negative coccoid bacteria
-obligate intracellular parasites
-no peptidoglycan in cell wall, grow intracellularly within host cell
-size of 200-300nm
-infective agent is the elementary body
-transmitted by interpersonal contact or airborne
-does NOT require insects or ticks for transmission

3

examples of clamydiae

1. chlamydia trachomatis causes trachoma dna nongonococcal urethritis
2. chlamydophila psittaci causes respiratory psittacosis (ornithosis)
3. chlamydophila pneumoniae causes mild form of pneumonia in young adults

4

rickettsia

-gram negative rod-shaped or coccobacilli
-obligate intracellular parasites
-300-1000nm size
-transmitted via insects or tick bites
-enter host cell by inducing phagocytosis
-damage permeability of blood capillaries and result in spotted rash

5

examples of rickettsia

(Causes spotted fevers)
1. R. prowazekii: epidemic typhus transmitted by lice
2. R. typhi: endemic murine typhus transmitted by rat fleas
3. R. rickettsii: Rocky Mountain spotted fever, transmitted by ticks