11 results
Causes of Culture Negative Abscess - Differential Diagnosis Framework
Consider prior antibiotics as a cause of a
Causes of Culture ... - Differential ... antibiotics as a cause ... of a negative culture ... #Differential #
Important Fungal Stains
Mycology Lab:
 • Calcofluor white - Fluorochrome that binds glucans and chitin in fungal
preparation from culture ... • India ink - "Negative ... #microbiology #microscopy ... #fungus #comparison ... #table
Endocarditis Algorithm - Infective vs Noninfective Causes
Noninfective:
 • Malignancy
 • Autoimmune disease
 • Systemic infection
Native Valve
vs Noninfective Causes ... disease • Systemic infection ... • HACEK • Culture-negative ... bacilli • Fungi ... #Differential #
Causes of blood culture negative infective endocarditis

Bartonella spp, Brucella spp, Coxiella burnetii, Chlamydia spp, Tropheryma whipplei,
culture negative ... Tropheryma whipplei, Fungi ... #differential # ... #culture #negative ... InfectiousDiseases #Microbiology
Blood Culture-Negative Infective Endocarditis (BCNIE)
Definition: No etiology found after 3 separate blood cultures remain negative for
Blood Culture-Negative ... remain negative ... fastidious bacteria or fungi ... but important causes ... Endocarditis #diagnosis #differential
Differentiating NBTE from Infective Endocarditis
No pathognomonic signs/symptoms or echo features that are specific to NBTE, and
Frequent false-negative ... in up to 30% of cases ... large infarct - Infectious ... #Endocarditis #comparison ... Marantic #diagnosis #table
Endocarditis Summary

Who?
Infectious:
• Pre-existing valvular disease
• Prosthetic valve
• Congenital heart disease
• IV substance use
• IV catheter
• Recent
Hypercoagulable (APLAS) Microbiology ... • Coagulase-negative ... Cerebral > Splenic, pulmonary ... Septic Emboli Cause ... Marantic (NTBE) Differential
Approach to Eosinophilic Lung Diseases
 • Acute Eosinophilic Pneumonia (< 1 wk) - ~30yo, M; Recent
, CNS, skin • Infectious ... (Variable) - Fungal ... #differential # ... diagnosis #comparison ... #table #eosinophilia
Endocarditis - Overview and Differential Diagnosis Framework

Who?
Infectious:
• Pre-existing valvular disease
• Prosthetic valve
• Congenital heart disease
• IV
- Overview and Differential ... Hypercoagulable (APLAS) Microbiology ... Negative: • Bartonella ... Cerebral > Splenic, Pulmonary ... Septic emboli cause
Lung Abscess - Diagnosis and Management Summary

Lung Abscess Etiology:
 • Necrosis of lung parenchyma by a
polymicrobial infection ... • Most common cause ... • Sputum/Blood cultures ... Prevotella • Fungal ... Lung #Abscess #pulmonary