甲型流感概述

甲型流感（Influenza A）是由甲型流感病毒引起的急性呼吸道传染病，其特征为起病急、发热、头痛、全身肌肉酸痛、乏力、食欲减退等。甲型流感病毒分为H1N1亚型、H3N2亚型、H5N1亚型、H7N9亚型、H10N8亚型、H2N2亚型、H9N2亚型、H7N7亚型、H11N6亚型、H12N5亚型、H13N4亚型、H14N3亚型、H15N2亚型、H16N1亚型、H17N1亚型、H18N1亚型、H19N1亚型、H20N1亚型、H21N1亚型、H22N1亚型、H23N1亚型、H24N1亚型、H25N1亚型、H26N1亚型、H27N1亚型、H28N1亚型、H29N1亚型、H30N1亚型、H31N1亚型、H32N1亚型、H33N1亚型、H34N1亚型、H35N1亚型、H36N1亚型、H37N1亚型、H38N1亚型、H39N1亚型、H40N1亚型、H41N1亚型、H42N1亚型、H43N1亚型、H44N1亚型、H45N1亚型、H46N1亚型、H47N1亚型、H48N1亚型、H49N1亚型、H50N1亚型、H51N1亚型、H52N1亚型、H53N1亚型、H54N1亚型、H55N1亚型、H56N1亚型、H57N1亚型、H58N1亚型、H59N1亚型、H60N1亚型、H61N1亚型、H62N1亚型、H63N1亚型、H64N1亚型、H65N1亚型、H66N1亚型、H67N1亚型、H68N1亚型、H69N1亚型、H70N1亚型、H71N1亚型、H72N1亚型、H73N1亚型、H74N1亚型、H75N1亚型、H76N1亚型、H77N1亚型、H78N1亚型、H79N1亚型、H80N1亚型、H81N1亚型、H82N1亚型、H83N1亚型、H84N1亚型、H85N1亚型、H86N1亚型、H87N1亚型、H88N1亚型、H89N1亚型、H90N1亚型、H91N1亚型、H92N1亚型、H93N1亚型、H94N1亚型、H95N1亚型、H96N1亚型、H97N1亚型、H98N1亚型、H99N1亚型、H100N1亚型、H101N1亚型、H102N1亚型、H103N1亚型、H104N1亚型、H105N1亚型、H106N1亚型、H107N1亚型、H108N1亚型、H109N1亚型、H110N1亚型、H111N1亚型、H112N1亚型、H113N1亚型、H114N1亚型、H115N1亚型、H116N1亚型、H117N1亚型、H118N1亚型、H119N1亚型、H120N1亚型、H121