Giardia Lamblia- These parasites are found in backcountry streams and lakes and municipal water supplies, swimming pools, whirlpool spas, and wells. Giardia infection can be transmitted through food and person-to-person contact. This type of parasite can be transmitted through pregnancy because it resides in the blood, gut and intracellular. Symptoms:Include watery, sometimes foul-smelling diarrhea that may alternate with soft, greasy stools, fatigue or malaise, abdominal cramps and bloating, ga