Infectious diseases are the invasion of a host organism by a foreign replicator, generally microorganisms, often called microbes, that are invisible to the naked eye. Microbes that cause illness are also known as pathogens. The most common pathogens are various bacteria and viruses, though a number of other microorganisms, including some kinds of fungi and protozoa, also cause disease. Prions are borderline, and memes would not usually be considered in this scope. An infectious disease is termed contagious if it is easily transmitted from one person to another.
Croup and Your Child - Fact sheet by American Academy of Family Physicians provides answers to common questions.
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404Infection Detection Protection - Site for kids explaining various bacteria, and ways to prevent infections and diseases. Some sections require additional plug-ins.
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Infectious Diseases in Children - Monthly news for pediatricians, covers new drugs and procedures for diagnosing and testing pediatric infectious diseases.