Q fever

Q fever Q fever is a zoonotic disease caused by the bacterium *Coxiella burnetii*, which is commonly found in livestock such as sheep, cattle, and goats. The disease was first identified in 1935 by Australian veterinarian Frank Macfarlane Burnet and his colleague H. M. Freeman while investigating a outbreak on a dairy farm in Queensland. Burnet was awarded the Nobel Prize in Physiology or Medicine in 1960 for his work on Q fever and viral hepatitis. The name "Q fever" comes from the phrase "query fever," which was used to describe a mysterious illness that was identified during an outbreak in 1935.

Overview

Q fever is a zoonotic disease that can affect humans and animals worldwide, with a significant impact on public health and veterinary medicine. The disease is caused by *Coxiella burnetii*, a Gram-negative bacterium that can survive in the environment for long periods of time. Coxiella burnetii is highly infectious and can be transmitted through various routes, including inhalation, ingestion, and contact with infected animals or contaminated environments.

Causes and transmission

The primary source of *Coxiella burnetii* is domestic livestock, including sheep, cattle, and goats. The bacteria are typically found in the placenta, amniotic fluid, and udder of infected animals. Humans can become infected through inhalation of contaminated aerosols, ingestion of contaminated food or water, or contact with infected animals or contaminated environments. Veterinarians, farmers, and laboratory workers are at high risk of infection due to their occupational exposure to infected animals.

Signs and symptoms

The signs and symptoms of Q fever can vary widely, ranging from asymptomatic to severe. Common symptoms include fever, headache, fatigue, and muscle pain. In severe cases, Q fever can cause pneumonia, hepatitis, and endocarditis. Pregnant women and individuals with underlying health conditions are at higher risk of developing severe Q fever.

Diagnosis

Diagnosis of Q fever is typically made through a combination of clinical evaluation, laboratory testing, and epidemiological investigation. Serological tests, such as indirect immunofluorescence assay and enzyme-linked immunosorbent assay, are commonly used to detect antibodies against *Coxiella burnetii*. Polymerase chain reaction (PCR) can also be used to detect the bacterium in clinical samples.

Treatment and prevention

Q fever is typically treated with antibiotics, such as doxycycline and fluoroquinolones. Vaccination is also available for high-risk individuals, such as veterinarians and laboratory workers. Prevention measures include avoiding contact with infected animals, wearing personal protective equipment, and decontaminating contaminated environments. Public health measures, such as surveillance and outbreak investigation, are also important for controlling the spread of Q fever.

Epidemiology

Q fever is a global disease that has been reported in many countries, including Australia, Europe, North America, and South America. The disease is typically found in areas with high densities of livestock and agricultural activities. Outbreaks of Q fever have been reported in various settings, including farms, abattoirs, and laboratories. Climate change and animal migration may also contribute to the spread of Q fever.

Category:Infectious diseases