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Definition Return to top
Q fever is an infectious disease that is spread by domestic and wild animals and ticks.
Causes Return to top
Q fever is caused by the bacteria Coxiella burnetii, which lives in domestic animals such as cattle, sheep, goats, birds, and cats. Some wild animals and ticks also carry the bacteria.
People get Q fever after exposure to raw (unpasteurized) milk, or after inhaling dust or droplets in the air which are contaminated with animal feces, blood, or birth products.
Symptoms usually develop 2 to 3 weeks after coming in contact with the bacteria. This is called the incubation period. Some people may have no symptoms; others may have moderately severe symptoms similar to the flu. If symptoms occur, they may last for several weeks.
People at risk for infection include slaughterhouse workers, veterinarians, researchers, food processors, and sheep and cattle workers. Men are infected more often than women, and most people who get Q fever are between 30 and 70 years old.
This disease is occasionally seen in children, especially those who live on a farm. In infected children younger than 3 years old, Q fever is usually discovered during a search for the cause of pneumonia.
Symptoms Return to top
Common symptoms include:
Exams and Tests Return to top
A physical examination may reveal crackles in the lungs and an enlarged liver and spleen. In addition:
Treatment Return to top
Treatment with antibiotics can shorten the length of the illness. Antibiotics that are commonly used include tetracycline and doxycycline. Tetracycline given by mouth should not be used by children who still have any baby teeth, because it can permanently discolor growing teeth.
Outlook (Prognosis) Return to top
You will get better even without treatment. However, complications can be very serious and sometimes even life-threatening. Q fever should always be treated if it is recognized as the cause of symptoms.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call your health care provider if you develop symptoms of Q fever. Also call if you have been treated for Q fever and symptoms return or new symptoms develop.
Prevention Return to top
Pasteurization of milk destroys the bacteria that cause early Q fever. Domestic animals should be inspected for signs of Q fever if people exposed to them have developed symptoms of the disease.
References Return to top
Marrie TJ, Raoult D. Coxiella burnetii (Q fever). In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2005: chap 186.
Raoult D. Rickettsioses. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 348.Update Date: 9/28/2008 Updated by: Linda Vorvick, MD, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.