The administration has sealed off all the poultry farms in Narayanganj Sadar and Bandar upazilas.

Earlier flu virus was detected at a farm in Bandar upazila of Narayanganj and two other farms in Savar.

Meanwhile, Health Adviser Maj Gen (retd) Dr ASM Matiur Rahman said bird flu is found only at some places in the country and it is under total control of the government.

"But we have to be very careful regarding the matter," he said while speaking as the chief guest at a seminar held at the auditorium of Square Hospital.

He also urged the media to make people aware about bird flu by presenting authentic news.

Around 6,000 chickens were culled at Mukta Poultry farm at Sadar upazila and Chistia Poultry Farms at Fatullah upazila in the district on Sunday night, reports our Narayanganj correspondent.

District Livestock officer Dr Abu Taher said they sent samples to the Central Laboratory as more than 200 abnormal deaths of chicken were detected.

The administration so far culled not less than 12,000 chickens at seven farms in Sadar, Bandar, and Sonargaon upazilas in the district, sources in the administration said, adding that three of the seven farms had confirmed bird flu case while culling was done in four other farms on suspicion.

Around 10,000 chickens also died abnormally.

The administration has sealed off all the poultry farms in Bandar and Sadar upazilas, keeping vigil all over the district.

Meanwhile, 2,681 chickens were culled at Sardar farm at Hemayetpur in Savar on Sunday night. Following detection of avian influenza in the afternoon the administration arranged the culling within a few hours, said sources working with the Bird Flu Control Room.