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Contact CDC: Find Your Answer Quickly, The answers to the most common questions we receive can be found on our website. Please check the CDC A-Z Index before contacting us with a question.

Contact CDC: Find Your Answer Quickly, The answers to the most common questions we receive can be found on our website. Please check the CDC A-Z Index before contacting us with a question.

A harmful algal bloom (HAB) occurs when toxin-producing algae grow excessively in a body of water. Algae are microscopic organisms that live in aquatic environments and use photosynthesis to produce energy from sunlight, just like plants. The excessive algal growth, or algal bloom, becomes visible to the naked eye and can be green, blue-green, red, or brown, depending on the type of algae.

Snacks give kids important nutrients and help control hunger between meals. Share these quick tips to help parents make healthy snacks.

What people eat can affect their heart health. Share these tips for heart-healthy eating.

Share these tips to help people stay active and healthy as they get older.

Talking to a family member or friend about losing weight can be hard. Share these tips to help people get the conversation started.

If a friend or loved one is depressed, talking to them about getting help can make a big difference. Share these tips to help people start the conversation.

Share these tips to help people talk to their partners about getting tested for sexually transmitted diseases (STDs).

Bullying is when a child tries to hurt another child physically or emotionally. Share these tips to help parents talk to their kids about bullying.

The best way to prevent bed bugs is to regularly check for them. Share these simple steps to help people prevent bed bugs.

The only way to know if you have HIV is to get tested. Share this list of questions to help people get screened.

Regular physical activity during pregnancy can help women have a more comfortable pregnancy. It may also help reduce the risk of complications. Share these tips to help pregnant women stay active.

Even though prostate cancer is common, screening for it isn't recommended. Share this information to help people start a conversation with their doctors about prostate cancer.

Mammograms can help find breast cancer early. Share this tool to help women talk with their doctors about mammograms.