Two communicable diseases prevalent in developing countries caused by unsafe drinking water and bad sanitation are

Schistosomiasis infection is acquired when people come into contact with fresh water infested with the larval forms of parasitic blood flukes, known as schistosomes. The microscopic adult worms live in the veins draining the urinary tract and intestines. Eggs from the mature worms are passed out (excreted) in the faeces or urine of an infected person. These eggs can get into fresh water if it is contaminated with human sewage. Symptoms can be bloody diarrhoea, abdominal pain, right upper quadrant pain, cramps.