Infections are also associated with childcare, especially involving diaper-aged children; close contact with family or household members who have giardiasis; ingestion of water or ice from untreated or improperly treated water from lakes, streams, or wells; backpackers, hikers, and campers who drink unsafe water or fail to practice good hand hygiene; ingesting water while swimming or playing in lakes, ponds, rivers, or streams; or exposure to feces through sexual contact.