Influenza Virus Pictures. Detailed, deeply researched scale models of the flu virus. There is a pandemic threat from G4 EA H1N1, a swine flu recently described in China. Also we have the 1918 and 2009 flu pandemics. And seasonal flu. Flu viruses have segmented genomes (8 parts) and when two or more strains infect the same cell, then daughter viruses can contain mixtures (re-assortments). Such reassortants are new strains. Some of these images are styled like vintage photographs to emphasise the historical nature of influenza.