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Concept
Chlamydia psittaci
Summary
Taxobox
| image = Chlamydophila psittaci FA stain.jpg
| image_caption = Direct fluorescent antibody stain of a mouse brain impression smear showing C. psittaci.
| domain = Bacteria
| phylum = Chlamydiota
| classis = Chlamydiia
| ordo = Chlamydiales
| familia = Chlamydiaceae
| genus = Chlamydia
| species = C. psittaci
| binomial = Chlamydia psittaci
| synonyms = Chlamydophila psittaci
Chlamydia psittaci is a lethal intracellular bacterial species that may cause endemic avian chlamydiosis, epizootic outbreaks in mammals, and respiratory psittacosis in humans. Potential hosts include feral birds and domesticated poultry, as well as cattle, pigs, sheep, and horses. C. psittaci is transmitted by inhalation, contact, or ingestion among birds and to mammals. Psittacosis in birds and in humans often starts with flu-like symptoms and becomes a life-threatening pneumonia. Many strains remain quiescent in birds until activated by stress. Birds are excellent, highly mobile vectors for the distribution of chlamydia infection, because they feed on, and have access to, the detritus of infected animals of all sorts.
C. psittaci in birds is often systemic, and infections can be inapparent, severe, acute, or chronic with intermittent shedding. C. psittaci strains in birds infect mucosal epithelial cells and macrophages of the respiratory tract. Septicaemia eventually develops and the bacteria become localized in epithelial cells and macrophages of most organs, conjunctiva, and gastrointestinal tracts. It can also be passed in the eggs. Stress will commonly trigger onset of severe symptoms, resulting in rapid deterioration and death. C. psittaci strains are similar in virulence, grow readily in cell culture, have 16S rRNA genes that differ by
Official source
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