LINK / CITE ADD TO WORD LIST. adjective. The definition of harmful is something that causes damage or is able to be hurtful. A chemical that causes you to become sick is an example of a chemical that would be described as harmful. causing or able to cause harm; hurtful. adjective.
The most common way to become infected with giardia is after swallowing contaminated water. Giardia parasites are found in lakes, ponds, rivers and streams worldwide, as well as in municipal water supplies, wells, cisterns, swimming pools, water parks and spas. Ground and surface water can become contaminated from agricultural runoff, wastewater discharge or animal feces.
Giardia: What Is Giardiasis? Giardiasis is the name of the disease caused by Giardia lamblia parasites that infect the small bowel. Giardiasis is caused by Giardialamblia parasites that damage the small intestine; Giardia lamblia forms cysts are transmitted to humans in contaminated water or food and by person-to-person contact.