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ColdZyme® Mouth Spray (ColdZyme) is a mouth spray intended to reduce the probability of catching a cold and/or can help shorten the duration of a cold if used at an early stage of the infection, by forming a barrier on the pharyngeal mucous membrane. This study evaluated the preventative effect of ColdZyme on common cold infections in personnel at elderly care facilities, and assessed the level of reduction in corresponding sick leave. The number of sick-leave days for the personnel decreaseddoi:10.4236/ojrd.2017.71002 fatcat:lh5rjovznbb5xfbegis3qqzvxi