Final answer:
Immunization and water purification are both examples of primary prevention, a strategy aiming to prevent diseases or injuries before they occur.
Step-by-step explanation:
Immunization and water purification are examples of primary prevention. Primary prevention strategies are those that try to prevent a disease or injury before it occurs. Immunization is a key component of primary prevention, as it builds immunity to prevent infectious diseases. Similarly, water purification prevents the spread of waterborne diseases by ensuring that the water supply is clean and free of pathogens.
It is important to recognize that primary prevention aims to reduce the incidence of disease by mitigating potential risks. Other examples of primary prevention include public health education and changes in public behavior, such as washing hands and reducing tobacco use, which play a significant role in enhancing communal health and extending life expectancy.