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Encyclopedia > Psittacosis

In medicine (pulmonology), psittacosis -- also known as parrot disease, parrot fever, and ornithosis -- is a zoonotic infectious disease caused by a bacterium called Mycoplasma psittaci and contracted from parrots, macaws, cockatiels, and parakeets. The incidence of infection in canaries and finches is believed to be lower than in psittacine birds.

In birds, Chlamydia psittaci infection is referred to as avian chlamydiosis (AC). Infected birds shed the bacteria through feces and nasal discharges, which can remain infectious for several months.

In humans, after incubation period of 5-14 days, the symptoms of the disease range from inapparent illness to systemic illness with severe pneumonia. It presents chiefly as an atypical pneumonia with influenza-like symptoms like fever, chills, headache, muscle aches, and a dry cough. Pneumonia can be often visualized on chest x-ray.

Diagnosis involves cultures from respiratory secretions of patients, fourfold or greater increase in antibody titers against C. psittaci in blood samples combined with the probable course of the disease.

Since 1996, fewer than 50 confirmed cases were reported in the United States each year. Many more cases may occur that are not correctly diagnosed or reported.

Complications in the form of endocarditis, hepatitis, myocarditis, arthritis, keratoconjunctivitis, and neurologic complications (encephalitis) may occasionally occur. Severe pneumonia requiring intensive-care support may also occur. Fatal cases have been reported (less than 1% of cases).

Bird owners, pet shop employees, and veterinarians are at risk of the infection. Some outbreaks of psittacosis in poultry processing plants have been reported.

The infection is treated with antibiotics. Tetracyclines are the drugs of choice for treating patients with psittacosis. Most persons respond to oral therapy (100 mg of doxycycline administered twice a day or 500 mg of tetracycline hydrochloride administered four times a day). For initial treatment of severely ill patients, doxycycline hyclate may be administered intravenously at a dosage of 4.4 mg/kg (2 mg/lb) body weight per day divided into two infusions per day (up to 100 mg per dose). In past years, tetracycline hydrochloride has been administered to patients intravenously (10-15 mg/kg body weight per day divided into four doses per day). Remission of symptoms usually is evident within 48-72 hours. However, relapse can occur, and treatment must continue for at least 10-14 days after fever abates. Although its in vivo efficacy has not been determined, erythromycin probably is the best alternative agent for persons for whom tetracycline is contraindicated (e.g., children aged less than 9 years and pregnant women).

This article is largely adaptation from sources available from http://www.cdc.gov.

  Results from FactBites:
Probable Psittacosis Outbreak Linked to Wild Birds | CDC EID (3983 words)
Psittacosis is most commonly reported among people in close contact with domestic birds, such as bird owners, poultry farmers, veterinarians, and workers within pet shops and poultry-processing plants (1–3,5,8–13).
Psittacosis became a notifiable disease in New South Wales (NSW), Australia, in 2001, and 38 laboratory notifications were received by the state health department that year, an incidence of 5.7 cases per 1,000,000 population for NSW (16,17).
In 1995, 16 cases of psittacosis among residents of a rural town in a forested area in southern Australia were linked to trimming and mowing lawns and time spent in a yard, which are thought to be proxies for exposure to infectious particles shed by free-ranging birds with chlamydiosis (15).
PsittacosisFAQ (3968 words)
Psittacosis is also found in wading birds and shore birds such as herons and egrets, and in many sea birds such as gulls, terns, and fulmars.
Psittacosis, or "ornithosis" as it is commonly referred to when this organism infects bird taxa other than parrots, has been positively identified in at least 140 avian species.
Since psittacosis outbreaks are so intimately connected to the exotic bird industry, it is the responsibility of those who are involved with the pet bird industry to devise methods of controlling this disease and preventing its spread.
  More results at FactBites »



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