Medical Microbiology

Table 1 2. 6 Continued:DigestiveGlandsandPeritoneum

Infection Mostimportant

pathogens

Laboratorydiagnosis

Liverabscess Usuallymixedbacterial

flora:

E.coli

OtherEnterobacteriaceae

Gram-negativeanaerobes

Gram-positiveanaerobes

Staphylococcusaureus

Streptococcuspyogenes

Streptococcusmilleri

Entamoebahistolytica

Microscopyandculture

frompusifspecimen

samplingfeasible(punctate,

biopsy,surgicalmaterial)

Serology

Splenicabscess Staphylococcusspp.

(inendocarditis)

Streptococcusspp.

(inendocarditis)

Enterobacteriaceae

Gram-negativeand

Gram-positiveanaerobes

Microscopyandculture

frompusifspecimen

samplingfeasible;blood

culture

Peritonitis

Primaryperitonitis

(rare;usuallythe

resultofhematogenous

dissemination)

Streptococcuspneumoniae

Streptococcuspyogenes

Gram-negative/-positive

anaerobes;

Enterobacteriaceae;

enterococci;rarely

Staphylococcusaureus

Microscopyandculture

frompus;(specimen

samplingduring

laparotomy,orpunctureif

necessary)

Secondaryperitonitis

(endogenousinfection

causedbyenteric

bacteria)

Usuallymixedaerobic-

anaerobicflora

Enterobacteriaceae

Gram-negativeand

Gram-positiveanaerobes

Microscopyandculture

frompus(specimensam-

plingduringlaparotomy,

orpunctureifnecessary)

642 12 EtiologicalandLaboratoryDiagnosticSummariesinTabularForm

12

Kayser, Medical Microbiology © 2005 Thieme