Immunoglobulin A contained in saliva originally played an antibacterial role. Researchers at Loughborough University in the UK found that the amount of this protein in saliva was inversely related to human immunity. They spent more than three years testing 38 racers who had participated in the America's Cup Sailing plug. It was observed that about three-quarters of players had a sharp decline in salivary immunoglobulin A. levels two weeks before they had a cold, although they felt good at that time.
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It is revealed that by detecting the amount of immunoglobulin A. contained in saliva, people can judge their own immune status and take timely measures in case of low immunity to prevent disease attack.