Systemic candidiasis is qutie obvious, parasites are less so. You can see the candida usually, as thrush, vaginitis, jock itch, athelete's foot, and you can self-diagnose it very easily with a questionnaire or spit test. The only misdiagnoses that happens with candida is that some people actually have Celiac Disease, not candida, or both. Candida is brought on by taking broad-spectrum Antibiotics and from eating a really bad diet high in Sugar and empty calories.

parasites can hide for years w/o the host knowing why they are grinding their teeth in the night. parasites and candida don't necessarily go hand in hand, except on the microbial level. And healing candida will usually cure the microbe baddies too, but it won't touch the larger worms.