Centers for Disease Control and Prevention: Diseases and conditions, safety, environment, emergency preparedness.
Clinical Trials: where to find one.
Genetics Home Reference: Genetic conditions;genes and chromosomes.
Mayo Clinic: Diseases & conditions,drugs & supplements.
Medline Plus: Very complete information from the NIH.
Merck Manual: Diseases and conditions, symptoms and drug information.
National Library of Medicine: Health information, history of medicine.

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