Doctor insights on:
Usually yes: A parasite by definition gets needed food or support at the expense of the host. This is different from symbiotic relationship where two organisms each benefit (see lichen for an example).See 2 more doctor answers
Anti-parasitics: Depends on what type of parasite it is...Nematode, cestode, amoeba, protozoa, and others. Would generally not treat a parasite infection without knowing what it is, unless type of parasite infection present based on symptoms, geography, epidemiology, risk factors, exposure....See 1 more doctor answer
Test: Some symptoms may be indicative of parasites, such as diarrhea, peri-anal itch, elevated level of certain blood cell type (eosinophil) etc..., but to definitely know if you have parasite is to identify it by specific tests (stool for ova and parasites, scotch tape test, anti body test and so on), if you think you may be infested with a parasites, tell your doctor about it.
Depends: Why do you think you have parasites? If you came from a place were intestinal parasites are common, you can get a stool o&p exam; there are other blood tests and exams that can be done, but the core question remains why you think you have parasites, and where are these parasites located?
Depends on parasite: There are many different types of parasites that may live in the intestine. With a light parasite burden, there may be no symptoms. With a heavier burden there may be vague abdominal discomfort, diarrhea, anemia, allergic symptoms, peri-anal itching, biliary and intestinal obstruction etc.
Yes: It is generally advised that you rinse all fresh produce before eating it. If you are still concerned that it may be contaminated, cooking the food item can kill possible parasites and bacteria. Do not contaminate foods by using knives, counters or cutting boards that may have come in contact with other infectious sources such as raw meat or poultry.See 1 more doctor answer
Treat the parasites: Generally, eat sensibly, avoiding the very greasy, salty, and sugary stuff, as anyone would. Real parasites once diagnosed (malaria, babesia, helminths) are best handled with specific medications. I hope that the person on whose behalf you are asking isn't the victim of a scam like "Live Cell Analysis" in which they're told they harbor innumerable horrid little creatures. Best wishes.
Not in the U.S.: Vermox is the medication for pinworms. In the U.S., vermox is by prescription only. I have heard that in some other countries, pinworm medication is over-the-counter. For other types of worms, blood parasites, and skin parasites, testing is needed and can be ordered by the doctor. Then treatment is with prescription medicines.See 1 more doctor answer
Just few examples..: Intestinal parasitic infections can often be diagnosed by examining the stool for eggs and parasites under a scope. Other parasitic infections i.e. Cutaneous larvae migran as pictured here--no testing needed! Trichinosis is an infection with larvae of a roundworm trichinella spiralis from infected-uncooked pork. This needs muscle biopsy. If u have trouble/concern, consult doc. Good luck.