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Male Hormone Reduces Effectiveness of Flu Vaccine - Study

Researchers have known for some time that men tend to experience more severe influenza and get sicker from microbial infections than women.  A new study suggests it may be that immune responses in men are affected by the male hormone testosterone.   In a small study involving 53 women and 34 men, researchers at Stanford University in California measured their antibody response to the 2008-2009 seasonal flu vaccine.  Vaccines stimulate the production of antibodies, which are...

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