12 results
Blood culture contaminants
Grouped by gram negative vs gram positive vs other as well as never/maybe/probably
Some additional
Blood culture contaminants ... Grouped by gram negative ... #Infections #Microbiology ... #Micro #Differential ... #contaminants
How to Determine a Contaminant vs True Infection 

What is the organism? Most 
common contaminants:
to Determine a Contaminant ... vs True Infection ... • Coagulase-negative ... How many blood culture ... species from the micro
Duke's Criteria for Infective Endocarditis
Definite IE - Pathologic Criteria:
 • Pathologic lesions - vegetation or intracardiac
Duke's Criteria for Infective ... Endocarditis Definite ... demonstrating active endocarditis ... Immunologic phenomena • Micro ... #Endocarditis #
Causes of blood culture negative infective endocarditis

Bartonella spp, Brucella spp, Coxiella burnetii, Chlamydia spp, Tropheryma whipplei,
Causes of blood culture ... negative infective ... endocarditis Bartonella ... #negative #Endocarditis ... InfectiousDiseases #Microbiology
Capnocytophaga
Pathogen: Capnocytophaga
 • 9 species, C. canimorsus responsible for the majority of infections
 • Gram-negative rod,
infections • Gram-negative ... 13%), Pneumonia, Endocarditis ... microorganism (Culture ... fusiform gram-negative ... #canimorsus #microbiology
Capnocytophaga spp on Culture and Blood Smear
Associated w/ dog/human oral flora, can cause bacteremia in immunocompromised
Capnocytophaga spp ... anaerobe; narrow Gram negative ... richdavisphd #Capnocytophaga ... #Smear #clinical ... #microscopy #microbiology
Differentiating NBTE from Infective Endocarditis
No pathognomonic signs/symptoms or echo features that are specific to NBTE, and
Differentiating NBTE from Infective ... high index of clinical ... serology: Serial negative ... Frequent false-negative ... /serology: + (Negative
Guide to Interpretation of Positive Blood Cultures

I arrange the potential Gram stain results that one can
Positive Blood Cultures ... Remember that clinician ... call from the micro ... reason to go to micro ... Interpretation #Laboratory #Microbiology
Capnocytophaga Canimorsus Skin Rash

40 M presents w/ N, V, severe epigastric pain. SHx: smoker, drinks 18
fastidious gram-negative ... to meningitis, endocarditis ... Myocarditis & culture-negative ... is difficult to culture ... infection should
Blood Culture-Negative Infective Endocarditis (BCNIE)
Definition: No etiology found after 3 separate blood cultures remain negative for
Blood Culture-Negative ... Infective Endocarditis ... remain negative ... antimicrobials, clinical ... #Infective #Endocarditis