(redirected from chlamydiosis)
Also found in: Dictionary, Thesaurus, Medical.
Related to chlamydiosis: parrot fever, Avian chlamydiosis


Any form of psittacosis originating in birds other than psittacines.



a disease of birds and man that is caused by viruses of the genus Chlamydia. Ornithoses, which belong to the zooanthroponosis group of diseases, were first described in 1875. The French scientist A. Morange named the disease psittacosis in 1895 (from Greek psittakos, “parrot”).

The causative agent of ornithosis is a virus discharged in the excrement and nasal mucus of birds. Humans may be infected by affected or carrier birds while caring for, slaughtering, or plucking the birds. Eating undercooked infected eggs may also cause infection. The infectious material is introduced into the mouth or the conjunctiva of the eye by contaminated hands. Infected dust may also enter the respiratory tract.

The incubation period of ornithosis is one to two weeks. The disease has an acute onset and proceeds with high temperatures lasting two to four weeks, headaches, muscle pains, and pneumonia (chest pains, dry cough). It is sometimes accompanied by nausea, vomiting, and constipation. These are also mild forms of ornithosis, in which the symptoms pass in a few days. Ornithosis does not result in stable immunity. Persons infected by the disease must be hospitalized. Ornithosis is treated with antibiotics and other medications.

Preventive measures include observing proper maintenance procedures on poultry farms, disinfecting, wearing special clothing when caring for poultry, observing the regulations governing the sale of products, controlling the pigeon population in cities, and prohibiting or restricting the importation of parrots.


Birds susceptible to ornithoses include chickens, ducks, geese, turkeys, pheasants, pigeons, canaries, and parrots. (In American terminology, ornithoses of parrots are called psittacoses.) The natural foci of the diseases are the gathering places of wild birds that live in colonies near water. Mostly young birds are affected.

The sources of the infectious agent are sick and recovered microbe-carrying birds. The infection proceeds through the respiratory and gastrointestinal tracts. Sick birds suffer from rhinitis and paralysis of the legs and wings; acute diarrhea is often a sympton. Diagnosis is based on epizootic testing, clinical symptoms, and laboratory tests. There is no specific treatment for the disease.

When poultry are affected with ornithosis, restrictions are placed upon the poultry farm. The importation, exportation, and regrouping of the birds are prohibited. Public health measures are taken that are directed toward preventing human infection.


Kazantsev, A. P. Ornitoz. Leningrad, 1973.
References in periodicals archive ?
A recent study showed that oral administration of doxycycline for 21 days was successful in treating chlamydiosis in experimentally infected cockatiels with an acute infection, so a shorter duration of treatment may be effective for some birds.
There are also other equally potentially harmful diseases which can be passed from lambing ewes to pregnant women, such as chlamydiosis (enzootic abortion of ewes - EAE), and listeriosis.
Key words: avian chlamydiosis, dermatitis, keratoconjunctivitis, Chlamydophila psittaci, doxycycline, avian, Magellanic penguins, Spheniscus magellanicus
0141), as part of the COST Action 855 (Animal Chlamydiosis and Zoonotic Implications).
In Peru, there are no laboratories that provide diagnostic tests for companion bird infectious diseases, such as chlamydiosis, herpesvirus infection, circovirus infection, and so forth.
Her research interests include the epidemiology and pathology of animal chlamydiosis and the role of obligate intracellular chlamydiae in ruminant abortions and their zoonotic potential to humans.
A spokesman for the Department for Health said: "The main infectious hazards for pregnant women in contact with sheep are chlamydiosis (EAE), toxoplasmosis and listeriosis.
10,11) Severe leukocytosis in birds is often associated with diseases such as aspergillosis, avian mycobacteriosis, salmonellosis, chlamydiosis, and sepsis, (12) but herpesviruses (ie, Marek disease) and retroviruses (ie, avian leukosis virus, reticuloendotheliosis virus) can specifically cause a lymphocytic leukocytosis in chickens.
Limits of the microimmunofluorescence test and advantages of immnnoblotting in the diagnosis of chlamydiosis.
Polymerase chain reaction assays performed on liver and spleen samples were positive for Chlamydophila psittaci in 2 of 3 birds tested, and histologic findings in 2 additional birds were compatible with chlamydiosis.
Proventricular dilatation disease, polyomavirus, chlamydiosis, aspergillosis; all the diagnostics and treatments are right there on the Internet
Moroney JF, Guevara R, Iverson C, Chen FM, Skelton SK, Messmer TO, Detection of chlamydiosis in a shipment of pet birds, leading to recognition of an outbreak of clinically mild psittacosis in humans.