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.
The group that received garlic had significantly fewer colds -- and the colds that they did get went away faster -- than the placebo group. Garlic also may help rid the intestinal tract of Giardia lamblia, a parasite that commonly lives in stream water and causes giardiasis, an infection of the small intestine. Hikers and campers run the risk of this infection whenever they drink untreated stream or lake water.