The police said 35-year-old Marufa Bibi of Nanoor in Birbhum district was yesterday referred to the hospital from a local hospital in her district with acute pain in the stomach.
She was administered the anti venum serum today when her condition deteriorated, but expired soon after.
Deputy director of the hospital Amitabha Saha said that the charge of neglect was untenable since her blood report showed she was bitten by a poisonous snake, only after which she was administered the AVS.
A post mortem would be conducted on the body of Bibi tomorrow to find out the exact cause of her death, Dr Saha said.