KidsHealth.org: Childhood Infections About this site: This section of KidsHealth.org provides a complete catalog of common--and not-so-common--childhood illnesses. (http://www.kidshealth.org/parent/general/index.html#sick) Pluses: Each illness entry outlines symptoms, prevention, home treatment, professional treatment, and contagiousness. Minuses: The site offers little interactivity. Best feature: Laboratory Tests and Other Diagnostic Medical Tests lets parents know why doctors take blood or ask for x-rays.