Four people have died due to an unknown disease while 20 others fell sick at Bhulbaria village in Santhia upazila of the district following attack of the disease.
A medical team, led by Dr Md Anisur Rahman, yesterday visited the affected area.
Abdul Hannan, 42, Taher Ali, 45, Md Kafil Uddin, 42, and Rekha Khatun, 44, of the village died last week following attack of the disease, said locals.
Of them, three died at the upazila health complex while Rekha died on way to the hospital.
At least 20 villagers affected by the disease are taking treatment at the health complex.
“The victims start to behave abnormally,” said Abdul Based, who was affected by the disease, adding that the patients sometime felt severe breathing problem.
“Due to mass psychogenic illness, the four died in different times,” suspected Dr Anisur Rahman, adding that they are further investigating to find out the reason of the deaths.