No, because terrain theory.

Parasites are a natural part of your body and make you healthier. Immunity doesn't even exist. If you get poisoned enough, you might just get parasites to clean the area, or other natural cleaning methods that the body has, such as bacteria, viruses, etc.

Trichinosis experiments disprove the idea that parasites are somehow harmful.

Edit: OP also has a thing against bacteria, not realizing that a human would die without bacteria. Stupid. You completely rely on bacteria for biological processes and wouldn't survive without them. Try eating antibiotics like candy and see how you are slowly turning into an NPC.

No, because terrain theory.

Parasites are a natural part of your body and make you healthier. Immunity doesn't even exist. If you get poisoned enough, you might just get parasites to clean the area, or other natural cleaning methods that the body has, such as bacteria, viruses, etc.

Trichinosis experiments disprove the idea that parasites are somehow harmful.