TOPICS: Influenza Virus, orthomyxovirus, RNA virus, negative sense, linear virus, 8 segments, helical capsid, in the nucleus, hemagglutinin, surface glycoprotein, viral entry, hemagglutinin antibodies, neuraminidase, zanamivir, oseltamivir, Tamiflu, genetic drift, random mutation, genetic shift, reassortment, fever, myalgias, cough, primary pneumonia, secondary bacterial pneumonia, aseptic meningitis, heart problems, Reye syndrome, killed vaccine, live vaccine
