The American Lung Association provides programs of education, community service, and advocacy. Some of the topics available include asthma, tobacco control, emphysema, infectious disease, asbestos, carbon monoxide, radon, and ozone.

The Centers for Disease Control and Prevention (CDC) is an agency of the U.S. Department of Health and Human Services. The CDC works with state and local health officials and the public to achieve better health for all people. The CDC creates the expertise, information, and tools that people and communities need to protect their health—by promoting health, preventing disease, injury, and disability, and being prepared for new health threats.

This website is sponsored by the Nemours Foundation. It has a wide range of information about children's health, from allergies and diseases to normal growth and development (birth to adolescence). This website offers separate areas for kids, teens, and parents, each providing age-appropriate information that the child or parent can understand. You can sign up to get weekly emails about your area of interest.

The National Institute of Allergy and Infectious Diseases conducts research and provides consumer information on infectious and immune-system-related diseases.

The National Institute on Aging (NIA), one of the centers of the U.S. National Institutes of Health, leads a broad scientific effort to understand the nature of aging and to extend the healthy, active years of life. The NIA funds research and provides information about health and research advances to the public and interested groups.

Flu.gov is a website sponsored by the U.S. Department of Health and Human Services. The site provides information about the flu, including seasonal flu, H1N1 (swine) flu, and avian (bird) flu. It offers answers to frequently asked questions, and it has special sections for older adults, caregivers, travelers, pregnant women, and health professionals. The website also offers guidance on vaccinations.