Tularemia is a topic covered in the 5-Minute Emergency Consult.

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Basics

Description

  • Tularemia is an acute febrile illness caused by the small aerobic gram-negative pleomorphic intracellular coccobacillus Francisella tularensis:
    • Organism is highly infectious.
    • Person-to-person transmission has not been reported.
  • Humans become infected through different environmental exposures:
    • Bites from infected tick, deerfly, mosquito, or other infected insect
    • Direct contact with infectious animal tissue or fluid
    • Contact with or ingestion of contaminated food, water, or soil
    • Inhalation of infected aerosols (e.g., cutting grass with power mowers, which may aerosolize the organism)
  • The 4 major strains of the bacterium have different virulence and geographic location:
    • 2 subspecies cause human infection in North America: F. tularensis subspecies tularensis (type A, more virulent) and F. tularensis subspecies holartica (type B, less virulent)
  • Natural hosts:
    • Lagomorphs and other rodents
    • Found in species of wild animals (insects, rabbits, hares, ticks, flies, muskrats, beavers, mice), domestic animals (sheep, cattle, cats), ticks, and water and soil contaminated by infected animals
  • Natural vectors:
    • Ticks
    • Biting flies
    • Mosquitoes
    • Wild rabbits
  • Weaponization of tularemia was accomplished during the Cold War:
    • Because of its virulence and ability to be aerosolized, it remains a potential biologic agent for mass destruction.
  • Lab technicians handling culture specimens are at high risk:
    • F. tularensis cultures should be manipulated only in a biosafety level 3 facility.
  • Also known as “rabbit fever” or “deerfly fever”

Etiology

  • Individuals who spend time outdoors in endemic areas are at higher risk:
    • Farmers
    • Hunters
    • Forest workers
    • Those who handle animal carcasses are at highest risk (taxidermists and butchers).
    • Two-thirds of cases occur in males.
  • Although tularemia can occur worldwide, it is endemic in the northern hemisphere:
    • Reported nationwide except in Hawaii
    • States with the highest incidence include Missouri, Arkansas, Kansas, South Dakota, and Oklahoma.
    • Few hundred cases annually in US, although probably underreported
    • Peak season is June–October.
  • Mortality is 5–15%. Appropriately treated patients have mortality as low as 1%.

Pediatric Considerations
  • 25% of cases occur in children 1–14 yr of age.
  • Children who spend time outdoors in endemic rural areas are at highest risk.

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Citation

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TY - ELEC T1 - Tularemia ID - 307139 Y1 - 2016 PB - 5-Minute Emergency Consult UR - https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307139/all/Tularemia ER -