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Granularity of neutrophils was measured in blood samples of healthy human volunteers (<jats:italic>n<\/jats:italic>\u2009=\u200932) taken before and after exposure for both the exposure and control sessions. A significant decrease in the granularity, indicative of neutrophil activation, was observed both in the exposure measurements and the exposure minus control measurements. Earlier EMF publications show immune function increase in isolated cells and more effective immune responses in animals with infections. 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