What is Amoebic dysentery and what are its symptoms?

(N/A) $Entamoeba \ histolytica$ is a protozoan parasite in the large intestine of humans that causes Amoebiasis (Amoebic dysentery).
Symptoms of this disease include constipation,abdominal pain and cramps,and stools with excess mucus and blood clots.
Houseflies act as mechanical carriers and serve to transmit the parasite from the feces of an infected person to food and food products,thereby contaminating them.
Drinking water and food contaminated by fecal matter are the main sources of infection.