Clinical signs generally persist for five to seven days before the animal's condition improves. During the recovery phase, 20% of cases develop corneal oedema and anterior uveitis ("blue eye"). In peracute cases, death rapidly follows the onset of clinical signs. | Clinical signs generally persist for five to seven days before the animal's condition improves. During the recovery phase, 20% of cases develop corneal oedema and anterior uveitis ("blue eye"). In peracute cases, death rapidly follows the onset of clinical signs. |