The mission of the American Social Health Association is to improve the health of individuals, families, and communities, with a focus on preventing sexually transmitted diseases and their harmful consequences.

The Division of Parasitic Diseases is a branch of the U.S. Centers for Disease Control and Prevention (CDC). Its mission is to prevent and control parasitic diseases throughout the world. Its Web site provides information and updates on parasitic diseases.

The National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention is a branch of the Centers for Disease Control and Prevention (CDC). Their Web site provides information and updates on sexually transmitted diseases (STDs), human immunodeficiency virus (HIV), and tuberculosis (TB). You can also find fact sheets on these health topics.

This website is sponsored by the Nemours Foundation. It has a wide range of information about children's health, from allergies and diseases to normal growth and development (birth to adolescence). This website offers separate areas for kids, teens, and parents, each providing age-appropriate information that the child or parent can understand. You can sign up to get weekly emails about your area of interest.

The National Women's Health Information Center (NWHIC) is a service of the U.S. Department of Health and Human Services Office on Women's Health. NWHIC provides women's health information to a variety of audiences, including consumers, health professionals, and researchers.

The Planned Parenthood Federation of American provides comprehensive reproductive health care and consumer information about family planning, sexual health, and sexually transmitted diseases (STDs).

The Teen Talk Web site (www.plannedparenthood.org/teen-talk) has information for teens about dating, teen pregnancy, sexual orientation, gender identity, how teens can protect themselves against STDs, and more.