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Are there any generic ways to determine if a person is infected with a parasite?

With "generic ways" I mean ways that do not rely on symptoms caused by a particular parasite. Also I am mainly concerned by parasites that are too large for the immune system to completely handle on its own (such as worms).

For example, can parasites be seen in x-rays, MRI scans, or through some body fluid samples?

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    $\begingroup$ It all depends on the parasite... $\endgroup$ – MattDMo Jan 21 '15 at 17:57
  • $\begingroup$ For some, you can do a stool examination for ova and parasites. The tests really depend on the parasite, as @Matt has said. Eosinophilia is common with roundworms as well, but it's nonspecific. $\endgroup$ – anongoodnurse Jan 21 '15 at 20:34
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The first thing that comes to mind would be eosinophils numeration. It is a specific type of white blood cell that handles parasitic infections. So in most cases, a blood sample would show an increase in this type of cell.

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