Approximately 95 percent of all infections start in the mucosal (moist) surfaces, including the eyes, nostrils, and mouth.54 These surfaces are protected by antibodies called IgA (short for immunoglobulin, type A), which provide an immunological barrier by neutralizing and preventing viruses from penetrating into the body. The IgA in saliva, for instance, is considered the first line of defense against such respiratory-tract infections as pneumonia and influenza.55 Moderate exercise may be all it takes to boost IgA levels and significantly reduce the chance of coming down with flu-like
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