Open AccessMolecular Detection of Microbes in Nasal Tissue of Dogs with Idiopathic Lymphoplasmacytic Rhinitis
Author(s) -
Windsor Rebecca C.,
Johnson Lynelle R.,
Sykes Jane E.,
Drazenovich Tracy L.,
Leutenegger Christian M.,
Cock Hilde E.V.
Publication year - 2006
Publication title -
journal of veterinary internal medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.356
H-Index - 103
eISSN - 1939-1676
pISSN - 0891-6640
DOI - 10.1111/j.1939-1676.2006.tb02854.x
Subject(s) - chlamydophila , bartonella , pathology , nasal cavity , medicine , polymerase chain reaction , mycoplasma , biopsy , microbiology and biotechnology , immunology , biology , chlamydia , virology , gene , biochemistry , surgery
Lymphoplasmacytic rhinitis (LPR) is a common histologic finding in dogs with chronic nasal disease; however, potential etiologies of this disorder have not been examined. We investigated the hypothesis that specific microbes contribute to clinical disease in dogs with LPR. Paraffin‐embedded nasal biopsies were obtained from 19 dogs with LPR, 10 dogs with nasal neoplasia, and 10 dogs with nasal aspergillosis. Nucleic acids were extracted from paraffin blocks, and real‐time quantitative polymerase chain reaction (PCR) was employed for detection of target genes for bacterial and fungal DNA, canine adenovirus 2 (CAV‐2), parainfluenza virus 3 (PI‐3), Chlamydia/Chlamydophila spp., and Bartonella spp. Conventional PCR was used for detection of Mycoplasma spp. Statistical analysis was performed using the Mann‐Whitney U ‐test for nonparametric data, and significance was set at P < 0.05. DNA or RNA for CAV‐2, PI‐3, Bartonella, Mycoplasma , and Chlamydophila was not detected in any nasal biopsy. DNA loads for bacterial DNA did not differ among disease groups. Detection of fungal DNA in nasal biopsies was highest in dogs with aspergillosis ( P < 0.0001); however, nasal biopsies of LPR dogs also displayed higher fungal DNA levels than samples from dogs with nasal neoplasia ( P = 0.016). Detection of high levels of fungal DNA in nasal biopsies of dogs with LPR suggests that fungal organisms may be causally associated with the inflammation observed, although the possibility of entrapment or accumulation of fungi in the nasal cavity due to chronic inflammation cannot be excluded. Further investigations are required to elucidate the underlying etiopathogenesis of LPR.