Which of the following is a method of reducing the spread of infectious diseases?

Promoting hand hygiene is a highly effective method of reducing the spread of infectious diseases. This practice helps to remove pathogens that may be present on the hands, which are often a primary vector for transmission. Handwashing with soap and water or the use of alcohol-based hand sanitizers can significantly lower the risk of infections, particularly in settings where individuals are in close contact, such as schools, hospitals, and public spaces. This measure is widely recommended by health authorities and is a fundamental public health strategy for controlling the spread of various infectious agents, including bacteria and viruses.

Other options do not contribute to controlling the spread of infectious diseases; for instance, discontinuing vaccinations can lead to increased susceptibility to preventable diseases, while encouraging close contact in public spaces raises the risk of transmission. Ignoring symptoms of illness can prolong the spread of an infectious disease, as individuals may unknowingly expose others to the pathogen.