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New emerging viruses like coronavirus 2019 (COVID-19) infections are always frightening. We know little about their transmission, behaviors, clinical manifestations, and outcomes. There is no vaccine or therapeutic strategies to deal with these infections yet. In this situation, preventive measures may be promising. Hand hygiene is a very important issue in preventing viral infection; however, there are other entities that can enhance the immune response and help in infection prevention. Herein we review some measures for boosting the immune system.