A barn housing 59 horses at Hoosier Park has been quarantined after one of the horses stabled in it showed symptoms normally associated with the contagious bacterial disease strangles. Test results from the ill horse are expected back within three days. If the results are positive for strangles, all horses located in the quarantined barn will be required to undergo mandatory testing for the disease. Strangles is caused by a bacterium called streptococcus equi and affects a horse's lymph nodes in its upper respiratory tract. Strangles is not usually fatal to horses, but can be in some cases.