PATHOLOGY

Detailed explanation-1: -Anything that touches poop from infected humans or animals can be contaminated with Giardia germs. People and animals become infected when they swallow Giardia germs.

Detailed explanation-2: -Giardia is distributed worldwide in lakes, ponds, rivers, and streams. It is even found in high quality water sources with no municipal wastewater discharges. All surface waters probably contain Giardia, and whether cysts are detected depends largely on the methods used to collect and analyze water samples.