The Centers for Disease Control & Prevention track infectious diseases in the United States. When there is an outbreak of disease (SARS, NIHI, etc.) or foodborne infections, this is the site to check. It includes links to the National Center for Health Statistics, International Classification of Disease (ICD), publishes the Morbidity & Mortality Weekly Report, and provides weekly data on cases of reportable diseases (meningitis, measles, etc.) by state. It is also the Agency responsible for the National Institute for Occupational Safety and Health (NIOSH) .

CDC Wonder (Wide-ranging Online Data for Epidemiologic Research) is an easy-to-use, menu-driven system that makes the information resources of the Centers for Disease Control and Prevention (CDC) available to public health professionals and the public at large. It provides access to a wide array of public health information.

The FDA is responsible for protecting the public health by assuring the safety, efficacy and security of human and veterinary drugs, biological products, medical devices, our nation’s food supply, cosmetics, and products that emit radiation.
MedlinePlus is the National Institutes of Health's freely available Web site for patients and their families and friends. Produced by the National Library of Medicine, it provides information about diseases, conditions, and wellness issues in clear language. MedlinePlus offers reliable, up-to-date health information.
NCBI As a national resource for molecular biology information, NCBI's mission is to develop new information technologies to aid in the understanding of fundamental molecular and genetic processes that control health and disease. From site
National Institutes of Health (NIH) The National Institutes of Health (NIH), a part of the U.S. Department of Health and Human ServicesExternal Web Site Policy , is the nation’s medical research agency—making important discoveries that improve health and save lives.
PubMed comprises more than 22 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

PubMed Central is a free archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM). In keeping with NLM’s legislative mandate to collect and preserve the biomedical literature, PMC serves as a digital counterpart to NLM’s extensive print journal collection. Launched in February 2000, PMC was developed and is managed by NLM’s National Center for Biotechnology Information (NCBI).