| prevalence of streptococcus equi subsp. equi in horses and associated risk factors in the state of rio grande do sul, brazil. | the aim of this study was to estimate the prevalence of equine strangles and to identify associated risk factors for this disease through a cross-sectional study of nasal swabs. nasal swabs (n=1010) from healthy equines (absence of nasal discharge, lymphadenopathy and cough) from 341 farms were plated on 5% blood agar; of these horses, 24 were identified as positive for streptococcus equi through isolation, pcr and dna sequencing. the estimated prevalence for individual animals was 2.3%, and for ... | 2016 | 26850537 |