Special hosts

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Special Hosts
Amaal Salhieh
Flashcards by Amaal Salhieh, updated more than 1 year ago
Amaal Salhieh
Created by Amaal Salhieh over 8 years ago
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Question Answer
Neutropenic patients are susceptible to.. (general) pyogenic, extracellular bacteria some opportunistic fungi
Define ANC <500/mm3
Neutropenic fever symptoms Fever and low ANC
Neutropenic fever Treatment Broad-spectrum penicillin Piperacillin-tazobactam (most commonly used), Cefepime, Ceftaz, maybe a carbapenem Add MRSA coverage if concern
Impaired CMI types of infections Intracellular - ~Listeria, Legionella, some mycobacteria (M. tuberculosis, M. leprae) Viruses ~Herpes ~Certain resp. viruses (RSV. parainflu) Fungi like endemic mycoses (histo, cocci, blasto) parasites like toxoplasma gondii Extracellular ~Aspergillus, Candida
Impaired Humoral Immunity types of infections (general) Encapsulated bacteria S. pneumoniae, H. influenzae
Asplenia have high risk to... (infections) S. pneumoniae H. influenzae Neisseria meningitidis
Early onset GBS meningitis pneumonia bacteremia
Late onset GBS meningitis and bacteremia
GBS Treatment Usually susceptible to penicillin
GBS Prophylaxis (no allergy) Penicillin G
GBS Penicillin-allergic (rash) Cefazolin Such a spaz for getting the rash
GBS penicillin allergic (anaphylaxis) Clindamycin When it's serious, you call Linda for help
Where does GBS colonize? Lower GI & GU tracts 10-30% of pregnant women vaginas
How do you perform a CAMP test? Streak S. aureus down the center. Streak GBS perpendicular to it. W/ GBS, you would see enhanced hemolysis (CAMP test-positive)
Microbio of Listeria Gram positive, short, regular bacillus Motile at 25, less at 37 Facultative intracellular
Listeria Pathogenesis Listeriolysin O Goes from one cell to the next by coordinating actin assembly to push bacteria to cell membrane
Granulomatosis infantiseptica Found with early onset Listeria Disseminated granulomas & abscesses with high mortality
Listeria Symptoms in Pregnant Women Fevers, chills, nonspecific symptoms
Neonates Late Onset of Listeria meningitis with sepsis
Listeria Treatment Ampicillin or Penicillin G TMP-SMX If meningitis, need ampicillin and either TMP-SMX or gentamicin bc ampicillin is low in CSF
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