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Immunoglobulin G (IgG) is the main immunoglobulin in natural human serum. It constitutes 70 to 75 percent of all immunoglobulins. Monoclonal antibodies have many applications in diagnosis, treatment and purification. The conjugated monoclonal antibodies against human IgG are used in most diagnostic kits.<br /><br />The influenza virion is an enveloped virus that derives its lipid bilayer from the plasma membrane of a host cell. Two different varieties of glycoprotein spike are embedded in the envelope. Most experts think that flu viruses spread mainly by droplets made when people with flu cough, sneeze, or talk. These droplets can land in the mouths or noses of people who are nearby (usually within about 6 feet away) or possibly be inhaled into the lungs.