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Biological Emergencies
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Plague
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Epidemiology
Highly infectious after aerosolization.
Person-to-person and animal-to-human transmission can occur with pneumonic plague via respiratory droplets.
Clinical
Incubation period is 1-3 days and ranges up to 7 days.
Aerosolization would most likely result in pneumonic plague.
Pneumonic plague presents with acute onset of high fevers, chills, headache, malaise and a productive cough, that is initially watery before becoming bloody.
Laboratory Diagnosis
Bacterial cultures (blood, sputum, or lymph node aspirate specimens) should be handled in a Biosafety Level 2 facility.
Wright, Giemsa, or Wayson stain shows gram negative coccobacilli with bipolar “safety-pin” appearance.
Organism grows slowly (48 hrs for observable growth) on standard blood and Mac-Conkey agar.
Immunoflourescent staining for capsule (F1 antigen) is diagnostic.
Patient Isolation
Strict respiratory isolation with droplet precautions (gown, gloves, and eye protection) until the patient has received at least 48 hours of antibiotic therapy and shows clinical improvement .
Treatment
Streptomycin (1 g IM bid) or gentamicin (5 mg/kg IM or IV qd) are the preferred antibiotics.
Tetracyclines or flouroquinolones are alternative choices.
Co-trimoxazole is recommended for pregnant women and children between the ages of 2 months and 8 years.
Chloramphenicol should be used for plague meningitis.
Prophylaxis
Antibiotic prophylaxis is recommended for all persons exposed to the aerosol or persons in close physical contact with a confirmed case.
Tetracyclines or flouroquinolones are recommended for 7 days from last exposure to a case.
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