And here is something from an interview with Aajonus Vonderplanitz (Raw Animal Food proponent) about parasites just to give you a different point of view:
The parasite myth is that they are pathogenic always. It has been my experience that parasites are able to eat and digest tremendous quantities of decaying tissue in short periods: that is a detoxification process. When an individual has parasites. s/he is afforded the quickest process of detoxification. However, unless s/he eats enough and assimilates enough protein to regenerate cells and replace the tissue, s/he is more likely to have ulcers that may fester and kill her/him. I have found that with the consumption of raw meats that provide the nutrients necessary for quick regeneration parasites are beneficial. By the use of antibiotics, strains of bacteria and viruses have developed that are immune to all known antibiotics. Medical science has discovered that bacteria and viruses can mutate, becoming immune to existing antibiotics. This is creating a very weak race. Basically, medical science creates a weak human race that will be highly susceptible to advanced bacteria and viruses. This could likely result in a plague that would make any previous plague look minor, resulting in an extinction level event.