Cockroaches touched by hand can be washed with running water or soapy water, and if there are no open wounds at the site of contact, they are usually not infected. Although cockroaches may carry a variety of microorganisms such as bacteria or viruses, if there are no open wounds on the hand and the hand is merely touched, it is usually not infected. The skin is a strong protective barrier for the human body, which can protect us from most bacteria and viruses. However, if there is an open wound on the skin, bacteria and viruses will take advantage of the opportunity to enter the body, but there is no need to worry too much, there are white blood cells, phagocytes and other killer cells in the body that can destroy foreign pathogenic microorganisms and play an immune response to resist the invasion of foreign pathogens. So even if you touch a cockroach, you don’t need to worry too much. Pay attention to your own cleanliness, if there are abrasions, bruises and other skin breaks, we should promptly deal with them, apply band-aids or gauze to bandage the wounds to avoid infection.