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    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Man sneezing into handkerchief outdoors. — Stock Photo
    Man sneezing into handkerchief outdoors.
    Mature man sneezing into handkerchief. — Stock Photo
    Mature man sneezing into handkerchief.
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus. — Stock Photo
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus.
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus. — Stock Photo
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus.
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus. — Stock Photo
    Digital illustration of glycoprotein spikes hemagglutinin and neuraminidase on influenza virus.
    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Mother taking temperature of son in bed. — Stock Photo
    Mother taking temperature of son in bed.
    Woman blowing nose on tissue outdoors. — Stock Photo
    Woman blowing nose on tissue outdoors.
    Boy blowing nose on tissue. — Stock Photo
    Boy blowing nose on tissue.
    Mother taking temperature of son in bed. — Stock Photo
    Mother taking temperature of son in bed.
    Preteen boy blowing nose indoors. — Stock Photo
    Preteen boy blowing nose indoors.
    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Nasal influenza vaccine on medical tray. — Stock Photo
    Nasal influenza vaccine on medical tray.
    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Mother taking temperature of son in bed. — Stock Photo
    Mother taking temperature of son in bed.
    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Mature woman blowing nose on tissue. — Stock Photo
    Mature woman blowing nose on tissue.
    Mature woman blowing nose on tissue. — Stock Photo
    Mature woman blowing nose on tissue.
    Swine influenza virus microscopic view — Stock Photo
    Swine influenza virus microscopic view
    Influenza virus particle — Stock Photo
    Influenza virus particle
    Flu virus particle structure — Stock Photo
    Flu virus particle structure
    Flu virus particle structure — Stock Photo
    Flu virus particle structure
    Influenza viruses budding from host cell — Stock Photo
    Influenza viruses budding from host cell
    Influenza viruses budding from host cell — Stock Photo
    Influenza viruses budding from host cell
    Viral particles enclosed in protective capsid — Stock Photo
    Viral particles enclosed in protective capsid
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Flu virus particles — Stock Photo
    Flu virus particles
    Viruses infecting human cells — Stock Photo
    Viruses infecting human cells
    Flu virus particle structure — Stock Photo
    Flu virus particle structure
    Influenza virus particles in blood stream — Stock Photo
    Influenza virus particles in blood stream
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Viruses infecting human cells — Stock Photo
    Viruses infecting human cells
    Influenza virus structure — Stock Photo
    Influenza virus structure
    Viruses infecting human cells — Stock Photo
    Viruses infecting human cells
    Antibodies attacking influenza viruses — Stock Photo
    Antibodies attacking influenza viruses
    Visual render of Swine flu — Stock Photo
    Visual render of Swine flu