Introduction of Chlamydia psittaci into a hospital area by feral pigeons.

Pigeons are associated with zoonotic pathogens such as Chlamydia psittaci, the main causative agent of avian chlamydiosis, and related to psittacosis cases in humans worldwide. The aim of the present study was to investigate the occurrence of C. psittaci in feral pigeons (Columba livia) and environmental samples from places frequented by pigeons in a Brazilian hospital area.

Diversity of Marek's Disease Virus Strains in Infections in Backyard and Ornamental Birds.

Marek's disease is caused by , commonly known as Marek's disease virus (MDV). This pathogen infects various bird species resulting in a range of clinical manifestations. The gene, which is crucial for oncogenesis, has been extensively studied, but molecular investigations of MDV in noncommercial South American birds are limited.

Chlamydia gallinacea in Brazilian backyard chicken farms.

Avian chlamydiosis is a bacterial infectious disease of birds, considered until recently caused only by Chlamydia psittaci, that now includes the newly described species C. buteonis, C. avium, and C.

Acute, fatal Sarcocystis falcatula infection in rose-ringed parakeets (Psittacula krameri).

Sarcocystosis is an important avian disease that affects several intermediate host species. Birds not endemic from Americas, like Old World psittacine species, appear to be more susceptible to lethal infection than New World psittacine species. The aim of this study was to investigate the sudden death of rose-ringed parakeets (Psittacula krameri) in an exotic private parrot's aviary.

Endogenous lipid pneumonia associated with atherosclerosis in a blue-fronted Amazon parrot (Amazona aestiva).

Endogenous lipid pneumonia is a rare inflammatory, non-infectious lung disease characterized by the accumulation of endogenous lipids in alveolar macrophages. It has been associated with bronchial obstruction, chronic lung inflammation, alveolar proteinosis and lipid storage disorders. A 14-year-old female blue-fronted Amazon parrot (Amazona aestiva) presented with intermittent dyspnoea, neurological signs and persistent lipaemia of unknown aetiology.