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Clinical Microbiology (Bloodstream infection (Clinical Signs and Symptoms,…
Clinical Microbiology
Bloodstream infection
Intravascular
infection originate within the cardiovascular system
Extravascular
bacteria from another site of infection entering
the blood circulation through lymphatic system
Bacteremia
Invasion by bacteria of cardiovascular system
Classification
By site of origin
Primary bacteremia
Secondary bacteremia
Fever of Unknown Origin (FUO)
By duration
Transient bacteremia
Intermittent bacteremia
Continuous bacteremia
By place of acquisition
Nosocomial bacteremia
Community acquired
Pseudobacteremia
Invasion associated with contaminated infusion fluids
Occult (unsuspected) bacteremia
No physical signs or symptoms of severe infection
Septicemia
bacterial Invasion and toxin production
Septic shock
Clinical Signs and Symptoms
hypotension
Prostration and diaphoresis
Tachypnea
Delirium, stupor, agitation
Nausea, vomiting
Specimen collection and transport
Hemoculture Bottle
Processing positive blood cultures
Positive Cultures -> Critical value
Gram stain immediately
CSF
Lumbar puncture (L3-L4)
Not fridge (4oC)
Only RT
Fluids/ aspirates
Pleural, peritoneal, pericardial, synovial fluids
Closed sterile container
1 - 5 ml.
Laboratory diagnosis
Direct examination
Grams stain (Bacteria)
India ink (Cryptococcus)
Culture method
Primary plate: BA, CA (5% CO2), Mac
Antimicrobial susceptibility testing
Serological test
Meningitis and other infection of
the central nervous system
Routes of infection
Hematogenous spread
Direct spread from an infected site
Anatomic defects in CNS
Travels along nerves leading to the brain
Diseases of CNS
Encephalitis
Inflammation of the brain parenchyma
Inflammation of the brain parenchyma
Parasitic meningoencephalitis
Brain abscess
Localized collections of pus in a cavity
Mimic meningitis symptoms
Severe meningitis and high mortality
Meningitis
Purulent meningitis
Aseptic meningitis
Sterile body fluids
Pericardial fluid
Peritoneal dialysis fluid
Peritoneal fluid
Pleural fluid
Joint fluid (Synovial fluid)