Giardia

Giardia is a tiny, single-celled parasite that can live in the intestines of humans and animals. It's responsible for a common intestinal infection called giardiasis, which can cause symptoms like diarrhea, stomach cramps, and bloating. People usually get infected with Giardia by consuming contaminated water or food, or through direct contact with an infected person or animal. The parasite forms a hard shell called a cyst, which allows it to survive outside the body for long periods and makes it resistant to common disinfectants. Once inside your body, the cysts open up and release the active form of the parasite, which then attaches to your intestinal walls and multiplies. Good hygiene practices, such as washing your hands regularly and avoiding contaminated water sources, can help prevent giardiasis.