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<br />Proteins on the virus determine its subtype <br /> <br />(H?) and ability to cause disease <br /> <br />Influenza <br />Subtypes <br /> <br />H1 <br />H2 <br />H3 <br />H4 <br />H5 <br />H6 <br />H7 <br />H8 <br />H9 <br />H10 <br />H11 <br />H12 <br />H13 <br />H14 <br />H15 <br />H16 <br /> <br />Human Swine Horse <br />. .,. <br />. <br />. .,. ~ <br />. <br /> ~ <br />. <br /> <br />Bird <br /> <br />** All 16 H-subtypes of influenza virus exist in <br />birds. unlike in humans, pigs and horses. <br /> <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />Jtf <br />J1f <br />Jtf <br /> <br />Adapted from Levine AJ. Viruses. 1992;165. <br /> <br /> <br />"':;""..'Q\ ~...................l............./...................................../.........._ <br />- ,::":." - <br />/' \ ,:,:'.\::..... <br /> <br />.ifl <br /> <br />VUIUC HEALTH [)(~AUMIiN't <br /> <br />3 <br />