Which intervention exemplifies primary prevention in community health?

Primary prevention focuses on preventing disease and promoting health before any signs or symptoms occur. Immunization against diseases is a fundamental example of this type of intervention. By vaccinating individuals, communities can prevent the onset of infectious diseases, reducing incidence and spread. This proactive approach aims to safeguard the health of the community, thereby diminishing the overall burden of disease.

In contrast, the other options represent different levels of prevention. Providing rehabilitation services is considered tertiary prevention, aimed at reducing the impact of an existing condition. Conducting health screenings is primarily a form of secondary prevention, as it aims to detect diseases early when they can be treated more effectively. Offering nutritional assistance can contribute to health but generally addresses issues related to nutrition and health management rather than preventing disease before it occurs. Thus, immunization stands out as the quintessential primary prevention strategy.