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https://www.cincinnatichildrens.org/news/release/2013/norovirus-vaccine-reduces-symptoms-illness-10-04-2013 Norovirus Vaccine Reduces Symptoms of Illness by More than Half, Early Research Shows An investigational vaccine appears generally well tolerated and effective against the most common strain of norovirus, reducing the main symptoms of the... symptoms of illness more than half https://www.sciencedaily.com/releases/2013/10/131004125012.htm Norovirus vaccine reduces symptoms of illness by more than half | ScienceDaily An investigational vaccine appears generally well tolerated and effective against the most common strain of norovirus, reducing the main symptoms of the... symptoms of illness more than half norovirus vaccine reduces