Raiganj: The North Dinajpur district health administration has been put on alert following the out break of malignant malaria in Raiganj, Karandighi and Goalpokhar blocks and the death of one person from the mosquito-borne parasite. Doctors are also concerned about the 2,000 infants suffering from fever in the three blocks. However, none of them have been found to be suffering from malignant malaria.