Dengue hemorrhagic fever (DHF) is a potentially lethal complication of mosquito borne viral disease, Dengue Fever. Thrombocytopenia is a constant finding in DHF/Dengue Shock Syndrome (DSS). We report two cases that fulfilled the WHO criteria of DSS: high fever, positive tourniquet test, severe thrombocytopenia (<10,000/mm(3)), hemo-concentration (Hematocrit increase >20%), hypotension and bleeding refractory to routine therapeutic measures, who showed dramatic improvement after receiving Intravenous Anti-D globulin (IV anti-D).