RASO, Tânia de Freitas; FERREIRA, Vivian Lindmayer; TEIXEIRA, Rodrigo Hidalgo Friciello e PINTO, Aramis Augusto. Survey on Chlamydophila psittaci in captive ramphastids in São Paulo State, Brazil. Cienc. Rural [online]. 2012, vol.42, n.7, pp.1249-1252.
ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782012000700018.
Research detects occurrence of antibodies anti-Chlamydophila psittaci in ramphastids
Researchers from Universidade de São Paulo (USP), of Municipal zoological park Quinzinho de Barros and of Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), São Paulo, Brazil, detected the occurrence of antibodies anti-Chlamydophila psittaci in 16% of birds of a zoological park of São Paulo State, Brazil. The study was published in Ciência Rural journal, v.42, n.7, of july 2012.
With the goal do evaluate the occurrence of Chlamydophila psittaci and correspondent antibodies in ramphastids, the researchers collected samples from the cloaca of 25 ramphastids of a zoological parke of São Paulo State. They submitted the samples to semi-nested polymerase chain reaction (semi-nestred PCR) for direct detection of the microorganism. Blood samples of the birds were submitted to Complement Fixation Test (CFT) for the detection of antibodies anti-C. psittaci.
The presence of C. psittaci was not detected in the cloacal swab samples tested by the PCR. Nevertheless, 16% of the birds were positive by the CFT. "The results show that some birds had previous contact with the microorganism and developed immune response, but without clinical signs of disease, explains the researcher Tânia de Freitas Raso.
Among the species with positive results, there are the saffron toucanet (Pteroglossus bailloni) and blacknecked-aracari (Pteroglossus aracari), two species with no descriptions related to C. psittaci published in the literature. "Each year many scientific articles addressing this subject are published in renowned journals, yet few studies are directed to research this agent in this particular group", comments Tânia.
The main importance of the research is to demonstrate that not only the Psittaciformes and Columbiformes species, already studied, are susceptible to infection by C. psittaci. Other species should be included in epidemiological surveillance of microorganisms with zoonotic potential, as they may contribute to the maintenance of the agent in the environment without necessarily developing clear clinical signs of the disease.
de Freitas Raso