The deceased, including three women, of Mushar tola of Anaith village under Nawada police station area were taken ill and succumbed to the unidentified disease at the Sadar Hospital, Kumar said.
Autopsies were conducted on the bodies and the visceras would be taken for further tests at a forensic laboratory in Patna, he said.
Three other persons with symptoms of the disease were under treatment at the hospital, he said.
On unconfirmed reports that the dead were victims of spurious liquor, Deputy Inspector General of Police, Shahabad range, Ajitabh Kumar ruled it out.