Disease is now uncommon and generally only seen 1 to 4 weeks after weaning, the peak being at 14 days. Sometimes the only sign is a good pig found dead. A staggering gate. Puffy eyelids giving a sleepy appearance. An abnormal high pitched squeak.
Pigs stop eating.
In the later stages become partially paralysed and go off their legs. Sometimes with nervous symptoms. Muscle twitching, fits. Diarrhoea is not a feature. Breathing difficulties become evident.