A diagnosis of a protozoan infection begins with identifying the symptoms most commonly associated with the condition. These symptoms depend on the type of single-celled parasite, referred to as a protozoa, involved and where in the body it is multiplying. A person's past exposure to protozoa through contaminated food, water, or insect bites is also taken into account. The diagnosis can be confirmed through a sample of blood, feces, urine, or phlegm.
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