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1

Chlamydiae – what’s new?

100%
Zareba-Marchewka K., Szymanska-Czerwinska M., Niemczuk K.
Journal of Veterinary Research
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2020
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tom 64
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nr 4
2

Prevalence of avian Chlamydophila psittaci in China

84%
Yang J., Yang Q., Yang J., He C.
Bulletin of the Veterinary Institute in Puławy
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2007
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tom 51
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nr 3
Examinations were carried out in 46 intensive farms in northern China to investigate avian Chlamydophila psittaci. Five hundred and twenty-five avian sera were selected for examining antibodies to C. psittaci by ELISA. One hundred and fifty-five clinical samples from throat swabs and oviduct tissues were tested for the presence of chlamydial antigen using IDEIA™ PCE chlamydia dual amplification immunoassay, and 60 samples were tested by ompA gene-based PCR. C. psittaci antibodies were detected in 387 (77.8%) out of 525 serum samples, with seroprevalences ranging from 50% to 100%. Among the tested samples, 98/150 (65.3%) in broilers, 173/210 (82.3%) in ducks, and 116/165 (70.3%) in laying hens were detected to be positive, respectively. Using PCE-ELISA test kits, in 91 out of 155 clinical samples the presence of antigen was confirmed, while 64 samples were negative. Forty-three PCR's were tested as positive out of 60 samples, while 17 samples were confirmed to be negative. Both higher positive antibodies and the presence of antigens were found in avian flocks associated with typical clinical signs suggestive of chlamydiosis. This study showed a severe prevalence of C. psittaci among different species of domestic birds in China.
3

Study of Chlamydophila psittaci outbreak in budgerigars

67%
Dovc A., Slavec B., Lindtner-Knific R., Zorman-Rojs O., Racnik J., Golja J., Vlahovic K.
Bulletin of the Veterinary Institute in Puławy
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2007
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tom 51
|
nr 3
In this paper, some facts have been discussed that could be important for the understanding of how the chlamydial pathogen spreads within the bird flock and to humans. The presented report has been based on pathological findings and interpretation of the results of diagnostic tests, obtained at chlamydial infection in a flock of parrots. In a two- week period, a high mortality in one flock of budgerigars (Melopsittacus undulatus) was reported. Adults as well as young older than 14 d died. The laboratory investigation confirmed the infection with Chlamydophila psittaci. In the same period two members of the owner's family showed signs of atypical pneumonia. The owner decided to eliminate the whole flock. Samples of blood and swabs from cloaca were taken before the birds were euthanised. A post-mortem examination was performed and samples from embryos and eggs were taken. For the confirmation of chlamydia infection, several different diagnostic methods were used: direct and indirect immunofluorescence, commercial immuno-enzymatic tests, isolation on chicken embryos and laboratory mice, as well as molecular detection. Avian chlamydiosis represents an important zoonosis in Europe. This is the reason for the necessity of developing more efficient methods for chlamydial disease control, and for setting up generally accepted rules in European and non-European countries.
4

Induction of a protective immune response against Chlamydophila psittaci in SPF chicken following vaccination with Omp-1 DNA and CpG oligonucleotides as an adjuvant

59%
He C., Li S., Yang L., He G., Liu W., Yao B.
Bulletin of the Veterinary Institute in Puławy
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2007
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tom 51
|
nr 3
In the present study we determined whether CpG motifs could be used as an immune adjuvant for the Omp-1 DNA vaccine against Chlamydophila psittaci, based on the major outer membrane protein (MOMP), to induce the protection in specific pathogen free chickens against an intranasal challenge. Six sequences of phosphorothioate-CpG oligodeoxynucleotides (CpG ODNs) with strong immunostimulatory activity were designed to be examined. The CpG ODN with three GTCGTT repeats significantly promoted splenic lymphocyte proliferation and increased macrophage nitric oxide in a in vitro study. Birds vaccinated with CpG ODN and pcDNA3.1:MOMP induced moderate antibody response and higher lymphoproliferative stimulation while chickens primed-boosted with DNA alone did not. Furthermore, DNA vaccine plus CpG ODN accelerated chlamydial clearance in the spleen and lungs, and decreased inflammatory cellular infiltration. All above evidences show that CpG ODN can be used as an effective adjuvant with a DNA vaccine and this immunisation protocol resulted in an enhanced clearance of Chlamydophila psittaci.
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