This disease is not new in India but has revisited for the third time after previously outbreaking in the two districts of West Bengal – Siliguri and Nadia in 2001 and 2007 respectively. High fatality rate (about 70 percent) and easy person-to-person transmission of the disease had already been established during its previous encounters but still, there is no vaccine for the prevention or cure of the disease and only supportive treatment is given for the disease-related complications including neurological and respiratory complications.