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**gram negative cocci :**, disease - Coggle Diagram
**gram negative cocci
:**
neisseria aerobic
neisseria meningitis (meningococcus)
characteristics:
gram - cocci (pink color)
kidney bean-shaped diplococci
oxidase + (purple color) by oxidation of phenyl diamine
maltose fermenter
large polysaccharide capsule
habitat & transmession
habitat: URT
transmession: respiratory droplets
pathogenesis
meningococcus will spread from the nasopharynx to the blood causing meningococemia= septicemia
endotoxin in the cell wall causes symptoms of the septic shock
IgA protease
capsule is antiphagocytic
prevention
The vaccine contains the capsular polysaccharides of strains A, C, Y, W135
rifampin & ciprofloxacin
treatment
antibiotics: penicillin G
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neisseria gonorrhoeae (gonococcus)
characteristics:
gram - cocci (pink color)
kidney bean-shaped diplococci
oxidase + (purple color) by oxidation of phenyl diamine
glucose fermenter
no capsule
habitat & transmession
habitat: human genital tract
transmession: by sexal contact
to neonates during birth
pathogenesis
gonorrhea will invade the M.M = inflammation
endotoxin in the cell wall: less severe and weaker than N.meningitis
IgA protease
pili
prevention
no vaccine no drug
interrupt the transmession
antibiotic eye drops for neoates with erythromyin &silver nitrate
treatment
ceftriaxone
tetracycline: for urethritis with chlamydia trachomatis
disease
gonorrhea
neonatal conjunctivits
pelvic inflammatory disease
commensal Neisseria
characteristics:
common in the oral cavity, nose, pharynx, and female genital tract.
have 3 species: N.subflava, N.mucosa, N.sicca
essentially not pathogenic
member involved in plaque formation
earliest colonizers of clean tooth surface
6.facilitate the subsequent growth of the facultative and obligate anaerobic late colonizers
veillonalla purvula
anaeobic
characteristics:
gram - cocci (pink color)
diplococcus
considered as benevolent oraganism
habitat & transmession
habitat: humen oral cavity, mostly in dental plaque
pathogenesis
metobolize the lactic acid produced bycarcinogenic oraganism to acetic, propionic weaker acids with reduced ability to solubilize the enamel.
disease
1.meningococcemia (blood)
2, meningitis