Rhinosporidiosis Associated Laryngeal Chondropathy. A Case Report

(365 cases), S. equi subsp. equi (286 cases), EHV-1 (183 cases) and ERAV/ERAB (69 cases). There were 47 horses with double infection and 5 horses with triple infection. Detection rate by qPCR for the different pathogens varied with season, age, breed and use. One of the limitations of the study was the lack of a control population. Thus, interpretation of the study results was only possible among specific etiological causes of IURD. While infectious respiratory pathogens were detected in 25.5% of study cases, the etiology for the remaining animals with clinical signs of IURD was not further investigated. Possible explanations for the high percentage of qPCR-negative results include false negative tests associated with wrong timing of sample collection, erroneous sample type, and improper sample storage and processing. Nasal secretions may be less reliable for the detection of S. equi subsp. equi when compared to nasopharyngeal swabs and washes or guttural pouch lavages. Other poorly characterized viral pathogens (adenovirus, EHV-2, EHV-5) also may be involved with IURD.