Following an incubation period of about 3–4 days, a variety of gastrointestinal symptoms appear, ranging from mild to severe bloody diarrhoea, mostly without fever.
Pärast ligikaudu 3– 4-päevast peiteaega tekivad mitmesugused seedeelundite sümptomid alates kergest kõhulahtisusest kuni raske verise kõhulahtisuseni, enamasti ilma palavikuta.