<prompt> During the first week of infection, Dengue can be best detected by:NS1 antigen detectionMACELISAICT test to detect IgMNone of the above  <response>: Dengue: - Caused by Group-B Arbovirus - D1, D2, D3, D4 - Vector - Aedes aegypti - Reservoir - Man, Aedes - Incubation period - 3 to 10 days - Diagnosis: Clinically - Torniquet test - 10 spots - Dengue fever ; 20 spots - Dengue hemorrhagic fever. Serologically - NS-1 Antigen Test comes positive even in 1st week. - Presentation: Dengue fever Dengue hemorrhagic fever Dengue shock syndrome - Backbone fever - Fever - Hemorrhagic features - Thrombocytopenia - Hemo-concentration - DHF ve - Shock - Vaccine : DENGAVARIA , Strain: CYD - TDV ; recommended in age groups 9-45yrs 