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This is another in a series of occasional MMWR reports titled CDC Grand Rounds. These reports are based on grand rounds presentations at CDC on high-profile issues in public health science, practice, and policy. Information about CDC Grand Rounds is available at http://www.

Michele C. Hlavsa, MPH1, Trisha J. Robinson, MPH2, Sarah A.

Most people feel dizzy now and then. Kids, like adults, may occasionally feel lightheaded or unsteady. But if such feelings repeat or interfere with everyday life, it could be a sign of a balance disorder.

Graves’ disease is an autoimmune disease that damages the thyroid. It affects more women than men and is the most common cause of hyperthyroidism.

Myths about HIV/AIDS can be harmful. Get the facts, including how to prevent and protect yourself from HIV.

What is the best way for women to lose weight? Every woman is different, but recent research suggests that women may lose weight differently than men.

Educational information for kids about pollution is presented by NIEHS.

Borderline personality disorder (BPD) causes a person’s moods, relationships, self-image, and behavior to be unstable from one day to the next.

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.

Although partnerships between park and recreation agencies and health agencies are prevalent, little research has examined partnership characteristics and effectiveness among communities of different sizes. The objective of this study was to determine whether park and recreation leaders’ perceptions of partnership characteristics, effectiveness, and outcomes vary by community size.