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Researchers at the University of Iowa have developed a vaccine that can combat dust-mite allergies by naturally switching the body’s immune response. In animal tests, the nano-sized vaccine package lowered lung inflammation by 83 percent despite repeated exposure to the allergens, according to the paper, published in the AAPS (American Association of Pharmaceutical Scientists) Journal. One big reason why it works, the researchers contend, is because the vaccine package contains a booster that alters the body’s inflammatory response to dust-mite allergens.