<prompt> The influenza virus has -5 segments of SS RNA8 Segments of ds DNA8 segments of ssDNA8 segments of ssRNA  <response>: Influenza virus Belong to orthomyxoviridae Envelope, RNA virus Contain single stranded RNA which is segmented 8 pieces There are three viral subtypes1. Type A Causes all pandemics and most of the epidemics2 Type B Can cause epidemics3. Type C Causes endemic infection Three types of influenza viruses are circulating in world AH1N1, AH3N2 and B A new type has been recognized A H5N1 Source of infection Case or subclinical case Mode of transmission Droplet infection by respiratory route Incubation period 18-72 hours Clinical manifestationsMost infections are subclinicalFever, headache and myalgiaRespiratory coughingThere is no viremia ComplicationsPneumonia M.C. by str. pneumoniaeWorsening of COPDEncephalitisReyes Syndrome with type B virusGB. SyndromeGI Symptoms gastric flu Type B virus Laboratory diagnosisMost commonly, the diagnosis is established by the use of rapid viral tests that detect viral nucleoprotein or neuraminidase. 