The causative agent of Calcutta haemorrhagic fever: chikungunya or dengue.
D002646:Chikungunya virus / Q000302:isolation & purification*; D003716:Dengue Virus / Q000302:isolation & purification*; D006482:Hemorrhagic Fevers, Viral / Q000209:etiology*; D006801:Humans; D066298:In Vitro Techniques; D007194:India