三、英译汉(30分,雷同者零分计)
Swine Influenza is an acute, febrile respiratory disease of swine with high morbidity and low mortality. It is commonly known in the industry as Swine Flu, Hog Flu, and Pig Flu. The etiology of Hog Flu is a Type A Influenza virus which belongs to the Orthomyxoviridae family. It is an enveloped, RNA virus with a lipid envelope and a helical nucleocapsid.
There are two structural proteins present on the virus. A Hemagglutinin and Neuraminidase protein. There are 13 different types of Hemagglutinin proteins. This hemagglutin protein is responsible for the attachment of the virus to the host-cell and for fusion of the viral envelope to the host-cell membrane. This results in agglutination of red blood cells. There are 9 different types of the neuraminidase protein. It is responsible for elution of virus from erythrocytes. It may play a role in the release of virus from infected cells.
These proteins play important roles in antibody formation and function. Antibodies to the hemagglutinin are responsible for preventing infection with an influenza virus containing the same hemagglutinin protein. Where as antibodies against the neuraminidase restrict the spread of virus from infected cells.