- Also called:
- rickettsial pneumonia or Balkan grippe
- Related Topics:
- biological weapon
- bovid
- tick
- notifiable disease
- Coxiella burnetii
Q fever
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What is Q fever?
Q fever is a systemic disease caused by the bacteria Coxiella burnetii. It spreads quickly among animals like cows, sheep, and goats, and often appears in localized outbreaks in humans. People can get it by breathing in dust that has been contaminated by the urine, feces, placenta, or birth fluids of infected animals. The infectious organism can also be found in the milk of infected animals; thus, the ingestion of contaminated dairy products can result in infection of humans and livestock. Symptoms include fever, chills, severe headache, and pneumonia. Though usually mild, Q fever can sometimes cause severe illness, but recovery outlooks are excellent.
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Which germ causes Q fever in humans?
The germ Coxiella burnetii causes Q fever in humans. Humans get infected by inhaling contaminated dust particles from infected animals, such as cattle and sheep. People who work with animals, like veterinarians and slaughterhouse employees, are more susceptible. Though generally mild, Q fever can sometimes become severe. Symptoms include fever, headache, muscle aches, and disorientation. Treatment involves broad-spectrum antibiotics like doxycycline. Avoiding unpasteurized milk and contact with potentially infected animals can help prevent Q fever.
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How does Q fever usually spread to people?
Q fever spreads to people primarily through the inhalation of dust contaminated with the urine, feces, placenta, and birth fluids of animals infected with Coxiella burnetii. This contamination leads to airborne dissemination of the rickettsiae, infecting those in close contact with livestock or contaminated materials. Less common transmission routes include consuming contaminated dairy products, blood transfusions, and tick bites. Individuals working with animals, like veterinarians and slaughterhouse employees, face a higher risk of infection. Avoiding raw milk consumption and contact with potentially infected animals can prevent the disease.
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What are the most common symptoms of Q fever?
Q fever, caused by Coxiella burnetii, manifests with an incubation period of two to four weeks. The onset is usually sudden, characterized by fever, chills, severe headache, muscle aches, loss of appetite, disorientation, and profuse sweating.
Respiratory symptoms may be minimal, with pneumonia sometimes only detectable via X-ray. Though generally mild, Q fever can occasionally lead to severe illness, but recovery prospects are excellent, with a mortality rate of less than 1 percent. Treatment with broad-spectrum antibiotics like doxycycline is typically effective.
Those working with animals or in slaughterhouses face a higher risk.
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How does Q fever affect organs in the body?
Q fever is a systemic disease caused by Coxiella burnetii, a type of rickettsia. The disease spreads quickly among animals such as cows, goats, and sheep; human outbreaks tend to be localized. Symptoms include fever, chills, headache, and pneumonia. Though usually mild, Q fever can sometimes result in severe illness. Q fever symptoms can include upper respiratory tract issues; pneumonia may only be detectable via X-ray. The mortality rate is less than 1 percent, and recovery is likely with antibiotics like doxycycline. People who work with animals, like vets or slaughterhouse employees, are at higher risk of getting infected.
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How is Q fever diagnosed and treated by doctors?
Q fever, caused by Coxiella burnetii, presents with fever, chills, headache, and pneumonia. Diagnosis involves identifying these symptoms, often through X-ray examination for pneumonia, as upper respiratory symptoms are minimal.
Treatment primarily involves wide-spectrum antibiotics like tetracycline, chloramphenicol, or doxycycline, which can shorten the illness. The prognosis for recovery is generally excellent, with a mortality rate of less than 1 percent.
Prevention includes avoiding raw milk, limiting contact with potentially infected animals, and, in high-risk areas like Australia, vaccination with killed C. burnetii is an option, especially for those in occupations with animal contact, such as veterinarians or slaughterhouse workers.
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Q fever, acute self-limited systemic disease caused by the rickettsia Coxiella burnetii. Q fever spreads rapidly in cows, sheep, and goats, and in humans it tends to occur in localized outbreaks. The clinical symptoms are those of fever, chills, severe headache, and pneumonia. The disease is usually mild, and complications are rare. Treatment with tetracycline or chloramphenicol shortens the duration of illness.
History
Q fever was first recognized in 1935 in Queensland, Australia, by Edward Holbrook Derrick. According to Derrick, Q stands for query, an appellation applied because of the many unanswered questions posed by the new disease at the time of its first description. The disease was originally encountered among abattoir workers, cattle ranchers, and dairy farmers in Australia and later among sheep ranchers, and it was at first thought to be restricted to that continent. However, several outbreaks of what was ultimately shown to be Q fever occurred among Axis and Allied troops in the eastern Mediterranean theatre of World War II during the winter of 1944–45. These were the first naturally occurring outbreaks of Q fever recognized outside Australia, and the disease thereafter was reported from various parts of the world.
Transmission
Q fever is transmitted primarily through the inhalation of dust contaminated with particles of urine, feces, and placenta and birth fluids from animals that are infected with C. burnetii. Contamination of the environment leads to airborne dissemination of the rickettsiae and thus to infection of persons in close contact with livestock, contaminated clothing, and other infected sources. Because the infectious organism also is found in the milk of infected animals such as cows and goats, the ingestion of contaminated dairy products can result in infection of humans and livestock. Less commonly, the organism may be transmitted via blood transfusion, in humans, or by the bite of an infected tick, in humans and livestock.
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Symptoms and treatment
The incubation period of the disease is two to four weeks, averaging about 18 to 21 days. The onset may be gradual but generally is sudden, and the disease is ushered in by fever, chills or chilly sensations, headache, muscle aches, loss of appetite, disorientation, and profuse sweating. Symptoms in the upper respiratory tract may be present but generally are infrequent and minimal; pneumonia, even when relatively extensive, may be detectable only by X-ray examination. Although Q fever is, on the whole, a mild disease, it can sometimes result in severe and protracted illness. The outlook for recovery is excellent; the mortality rate is believed to be less than 1 percent. The disease is amenable to therapy with wide-spectrum antibiotics, particularly doxycycline, which is highly effective.
Q fever seems to be in large part an infection associated with particular occupations; for example, individuals who work with animals, such as veterinarians, and those who work in slaughterhouses are at increased risk of infection. In some places, such as Australia, a vaccine prepared from killed C. burnetii is available and can be used to protect persons whose work makes them likely to be exposed to infection. The disease can also be prevented by avoiding the consumption of raw milk and by avoiding contact with animals that may be infected.