H2N2 virus, Influenzae Russian Flu, 1889
Size: 80–120 nm
Transmission: Avian to human to human
Location: Turkestan to Worldwide
Number of deaths: 1 million

H1N1 virus, Influenzae Spanish Flu, 1918–1920
Size: 80–120 nm
Transmission: Poultry to human to human
Location: China to Worldwide
Number of deaths: 50 million

H3N2 virus, Influenzae Hong Kong Flu, 1968–70
Size: 80–120 nm
Transmission: Pigs to human to human
Location: China to Worldwide
Number of deaths: 1>4 million

 A/H1N1pdm09 virus, Influenzae Swine flu, 2009
Virion size: 80–120 nm
Transmission: Pigs to human to human
Location: Mexico to Worldwide
Number of deaths: 284,000