Which of the following is an example of a public health intervention?

Health education campaigns exemplify a public health intervention because they are designed to inform and influence populations about health-related issues, promoting healthy behaviors and practices on a community or population level. This type of intervention engages a large audience, aiming to change knowledge, attitudes, and behaviors regarding health, which can lead to improved health outcomes across entire communities.

In contrast, vaccine development, while critically important to public health, is primarily a scientific and medical research activity focused on creating vaccines rather than directly engaging with the public to modify health behaviors. Medical practices research investigates the effectiveness and efficiency of health care services, which is vital for improving healthcare delivery but does not constitute an intervention in the public health realm. Individual health counseling is geared towards supporting a single person in their health journey, thus lacking the broader application of public health strategies aimed at populations.