The Authors describe a diagnostic approach used in a horse breeding where
recurrent upper respiratory infections strangles-like occur. Nasopharyngeal swabs and guttural
pouches lavages for citological and bacteriological assessement have been performed. No
empyemas or chondroids were evident in guttural pouches and no Streptococcus equi has been
isolated. For these reasons it’s possible to assert that no asymptomatic carriers were present in
the breeding and endemic infection can be excluded. More investigations will be necessaries
in order to verify the possible involvment of others Streptococcus species in the genesis of
that kind of disease
