More than 12 persons of Cheremera village under Jhankarpali gram panchayat have also been affected due to the water-borne disease and were under treatment at Bolangir district headuarters hospital, B K Kindo, Chief District Medical Officer (CDMO), Bolangir, said.
The mother and son who died on Friday were identified as Mando Bhati (70) and her son Uma Shankar Bhati (40).
The condition of Uma's wife Sukanti and daughters Jamalini, kamalin and Amalini's was serious. They were being treated at the hospital.
The people of the village might have been affected by the disease as they were using contaminated water from the nearby ponds, the CDMO said.
All possible steps have been taken to combat the disease, he said.