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Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
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Ross River virus.

Bridget Barber1, Justin T Denholm, Denis Spelman

  • 1Victorian Infectious Diseases Service, Royal Melbourne Hospital, Victoria. bridgetbarber@hotmail.com

Australian Family Physician
|November 7, 2009
PubMed
Summary

Ross River virus is a common Australian arbovirus causing epidemic polyarthritis. Prevention focuses on mosquito bite avoidance, as most cases occur during the wet season in northern Australia.

Area of Science:

  • Arbovirology
  • Epidemiology
  • Public Health

Background:

  • Ross River virus is Australia's most prevalent arbovirus.
  • It causes epidemic polyarthritis, leading to significant illness and societal costs.

Purpose of the Study:

  • To enhance clinician awareness of Ross River virus.
  • To detail epidemiological and clinical characteristics.
  • To provide guidance on prevention, diagnosis, and management.

Main Methods:

  • Literature review of epidemiological and clinical data.
  • Synthesis of current knowledge on Ross River virus.
  • Focus on clinical presentation and management strategies.

Main Results:

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  • Ross River virus outbreaks are frequent across Australia, particularly in the north during the wet season.
  • High mosquito exposure increases risk.
  • Arthralgia, rash, fever, and lethargy are common symptoms.
  • Conclusions:

    • No specific treatment alters the illness course; symptomatic relief with analgesics is recommended.
    • Most patients recover within six months.
    • Personal protective measures against mosquitoes are crucial for prevention.