Gram-negative coccobacilli and cocci

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Presentation transcript:

Gram-negative coccobacilli and cocci Prof. Dr. Asem Shehabi Faculty of Medicine University of Jordan

Haemophilus Group Gram-negative cocco/large- thin bacilli.. Aerobic.. Requires growth factors ( V- X-factors).. Grow around hemolytic Staphylococcus spp. Normal Flora.. Human Respt. Tract.. Died Rapidly Outside Body( 30 minutes) Many Haemophilus sp. Virulence factors: Endotoxin & Capsule.. H. influnzae type b: Most common pathogenic species.. capsulated .. Causing Localized and Invasive Infect.. Sore Throat, Otitis Media, Sinusitis, Conjunctivitis, Brochopneumonia, Septicemia & Meningitis.. Children 6 Months-5 Years. Lab Diagnosis: Blood, CSF & Others Culture.. Chocolate & blood agar included X & V Factors.. Antibiotics.. Hib-Vaccine.. Infants > 2 months old.

Haemophilus colonies growth surrounding Stapholococcus colonies

Bordetella pertussis Gram-negative coccbacilli.. Aerobic.. Highly Communicable agent.. Droplets Infection..close contact.. Mucosa Respiratory Tract.. Produce Pertussis Toxin.. Whooping Cough/ paroxysmal cough.. Pertussis.. Infants Children more susceptible than adults, high fatal in Adults than in children. Antibiotics are useful in first stage Prevention: DTP vaccine within first 2 -4-6 Ms. Diagnosis: Clinical signs and Symptoms. Less Culture & Lab tests.

Neisseria & Moraxella Groups Neisseria spp., Moraxella spp.: Gram-negative diplococci, Facultative anaerobes, Oxidase/Catalase+ve, Highly susceptible to Low/High Tempt… Dryness, Rapid Autolysis .. Room Tempt. Normal Flora Respiratory Tract.. Rare Non-pathogens (N. sicca, N. flava, M. Mucosa).. Common Pathogens.. N. gonorrhea, N. meningitidites. 1-N.gonorrhea: Pili, IgA-Protease, LPS, Colonization Mucosa.. Invasion..Inflamation.. Genitourinary Tract, Rectum,Throat, Sexually Transmitted Diseases.. Acute/Subacute/Asymptomatic Infections.. Uretral/Vaginal Discharge, Urethritis, Cervicitis, Salpengitis.. Common Reinfection..

Neisseria Gramstain-Intracellular Presence in Urethral Discharge

Follow/2 Lab diagnosis: Direct Gram-stain.. Intracellular G-ve diplococci in WBCs (pus cells).. Rapid Culture in Blood/chocolate Agar.. Antibiotics, No Vaccine. 2- N. meningitidites: Capsular Polysaccharides, LPS, IgA-Protease, Serotypes A,B,C, Invasive, Exogenous Infect. Respt.Tract.. Sore Throat.. Septicemia.. Meningitis.. Acute disease with high Mortality without treatment. Children (6-Months-5 years) more susceptible than adults. Epidemic outbreaks. Protective Vaccine is available. 3- M. catarrhalis: Part of normal Respiratory tract.. Opportunistic pathogen.. Pneumonia.. Rarely Septicemia.. Compromised Lung/heavy smokers. Lab Diagnosis: Direct-Gram-stain, Culture Blood/ chocolate Agar, Biochemical tests, Antibiotics,