Exam 3 Flashcards
Neisseria pathogens
Meningitides and Gonorrhae
Diplococcus Shape
Neisseria and Moraxella
Coccobacilli Shape
Haemophilus and Bordetella
Present in the Respiratory Tract
MoraxELLA, BordetELLA, LegionELLA
Present in the Respiratory and Genital Tract
Chlamydia (envelope) and Mycoplasma (no cell wall)
Organisms that aren’t Gram-Negative
Mycoplasma
In Neisseria meningitides, virulence depends on
Serogroup (B associated with epidemics) and patient immunity
Neisseria meningitides & gonnorrhoeae is transferred
Person to Person
Neisseria & B. Pertussis can be eliminated by chemoprophylaxis?
YES
Neisseria and H. influenzae TYPE B can be prevented by vaccination?
YES
Epidemic acute bacterial meningitis releases what toxin?
Meningococcal Endotoxin
Neisseria meningitides is charactered by
petechial rash
Neisseria gonorrhoaea requires what environment to grow?
Aerobic (requires O2) warm moist environment
What promotes virulence in Neisseria gonorrhoeae?
Pili (attachment and neutrophil resistance)
Invasion occurs in N. gonorrhoeae by
LOS (lipo-oligosaccharide) interacts with urethral, cervical endothelial cells to infect
Haemophilus influenzae requires what for growth?
RBC (erythrocytes)
H. influenzae is spreaded by
Direct Contact or Airborne droplets
H. influenzae type B causes
meningitis and epiglottis
H. influenzae non-typeable (no capsule) causes
Otitis media, exacerbations of COPD (AECB), CAPneumonia
H. influenze type B requires what treatment?
HIGH dose IV Beta-Lactams (3rd Generation Cephalosporins)
Moraxella Catarrhalis causes
Otitis Media and AECB
Bordetella Pertussis causes
WHOOPING COUGH
B. Pertussis can be prevented by
TDAP
B. Pertussis virulence factors include:
Adhesins (FHA)
Host Defense Evasion (ACT) and (PT)
Ciliate epithelia cell destruction (TCT)
Stages of Whooping Cough
Catarrhal - Rhinorrhea, Ocassional Cough
Paroxysmal - Spasms of uncontrollable cough
Convalescent - Recurrance
B. Pertussis Treatment
Macrolides (-mycin)
Beta Lactam are NOT active against
Legionella
Chlamydia
Mycoplasma
Legionella requires what for growth?
L-cysteine
Common pathogen of Legionella?
L. Pneumophila
Legionella is present in
WATER (Lives in amoebas)
Found in water heaters, air conditioning, cooling towers
Legionella is spread by
inhalation of bacteria into lungs
Legionella causes
Legionnairs’ disease
(sporadic and epidemic pneumoia)
Indistinguishable from other organisms
Legionella, Chlamydia & Mycoplasma Treatment
Macrolides, Tetracyclinies, Fluoroquinolones
NOT SUSCEPTIBLE TO BETA LACTAMS