1C33

ICD-11 MMS 2026-01

Q fever

Description

A disease caused by an infection with the gram-negative bacteria Coxiella burnetti. This disease is characterised by fever, or may be asymptomatic. Transmission is by inhalation of the bacteria, contact with contaminated milk, urine, faeces, vaginal mucus, or semen of infected animals, or through the bite of an infected tick.

Index terms

  • Q fever
  • Australian Q fever
  • Balkan grippe
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  • Infection due to Coxiella burnetii
  • Nine Mile fever
  • Quadrilateral fever
  • Pneumonia in Q fever
  • Q fever pneumonia
  • Cardiac Q fever
  • Q fever endocarditis

Inclusions

  • Infection due to Coxiella burnetii
  • Nine Mile fever
  • Quadrilateral fever

Exclusions from above levels

  • NE83.1 – Infection arising from device, implant or graft, not elsewhere classified

Sibling codes

  • 1C30 – Typhus fever
  • 1C31 – Spotted fever
  • 1C32 – Rickettsialpox
  • 1C3Y – Other specified rickettsioses
  • 1C3Z – Rickettsioses, unspecified

Foundation entity

Q fever – http://id.who.int/icd/entity/2113860626

Allowed postcoordination axes

Part of: 01: Certain infectious or parasitic diseases