Influenza Microchapters |
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Influenza causes On the Web |
American Roentgen Ray Society Images of Influenza causes |
For more information about non-human (variant) influenza viruses that may be transmitted to humans, see Zoonotic influenza
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]; Associate Editor(s)-in-Chief: Alejandro Lemor, M.D. [3]
Influenza infection is caused by the influenza virus that belong to the family Orthomyxoviridae. Three types of influenza virus have been reported to cause clinical illness in humans: types A, B, and C. Influenza virus can be found in humans, as well as in poultry, pigs, and bats.
Viruses; ssRNA viruses; ssRNA negative-strand viruses; Orthomyxoviridae; Influenzavirus A; Influenza A virus[1]
Viruses; ssRNA viruses; ssRNA negative-strand viruses; Orthomyxoviridae; Influenzavirus B; Influenza B virus[1]
Viruses; ssRNA viruses; ssRNA negative-strand viruses; Orthomyxoviridae; Influenzavirus C; Influenza C virus[1]
Species | Hemagglutinin Subtypes |
Neuraminidase Subtypes |
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Humans | H1, H2, H3, H5, H6, H7, H9, H10 | N1, N2, N6, N7, N8, N9 |
Poultry | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16 | N1, N2, N3, N4, N5, N6, N7, N8, N9 |
Pigs | H1, H2, H3, H4, H5, H9 | N1, N2 |
Bats | H17, H18 | N10, N11 |
Adapted from CDC [8] |
Electron Micrograph Images of H7N9 Virus from China.
Image obtained from CDC.
Produced by the National Institute of Allergy and Infectious Diseases (NIAID), this digitally-colorized transmission electron micrograph (TEM) depicts numbers of H1N1 influenza virus particles. Surface proteins located on the surface of the virus particles are shown in black.
Image obtained from Public Health Image Library (PHIL).
This negatively-stained transmission electron micrograph (TEM) captured some of the ultrastructural details exhibited by the new influenza A (H7N9) virus.
Image obtained from Public Health Image Library (PHIL).
This colorized transmission electron micrograph (TEM) revealed the presence of a number of Novel H1N1 virus virions in this tissue culture sample.
Image obtained from Public Health Image Library (PHIL).
This negatively-stained transmission electron micrograph (TEM) revealed the presence of a number of Hong Kong flu virus virions, the H3N2 subtype of the influenza A virus.
Image obtained from Public Health Image Library (PHIL).