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In-depth information on specific cancer topics, as well as interactive help tools for making treatment decisions.

Information on heart attack, stroke, and cardiac arrest warning signs; diseases and conditions; and children and heart disease.

This website provides authoritative information on breast cancer treatment, prevention, screening and testing, research, statistics, and clinical trials.

The Centers for Disease Control and Prevention Seasonal flu website includes information on flu basics, prevention, and treatments.

Website of the Centers for Disease Control and Prevention (CDC) provides links to immunization schedules in PDF for adults, adolescents, and children; recommendations and guidelines; list of vaccine-preventable diseases; answers to common questions; and information about vaccine safety and side-effects.

Mayo Clinic's web site provides authoritative information on all aspects of cholesterol, as well as cholesterol and heart disease risk calculators.

Maintained by the National Library of Medicine (NLM) at the National Institutes of Health (NIH), provides access to information on publicly and privately supported clinical studies on a wide range of diseases and conditions.

Easy-to-understand health information from the American Academy of Family Physicians.

Gateway site from the U.S. Dept. of Health provides links to consumer health information from government agencies and non-profit organizations.

Mayo Clinic's staff of physicians and researchers provides detailed articles on diseases and conditions, as well as drug information.

Includes drug database, medical encyclopedia and dictionary, and information on over 600 diseases and conditions.

Interactive breast cancer tutorial and information about symptoms, diagnosis, treatment, screening, and prevention from the National Library of Medicine, the National Institutes of Health, and other health-related agencies and organizations.

Authoritative resource of "expert-reviewed" cancer information, searchable by type of cancer.

Features database of more that 1,100 rare diseases.

Current and comprehensive information about specific types of cancer.

FDA's web site provides information about a wide variety of topics for consumers.