Apparently the worst thing that can happen to a parasite is to end up inside the wrong host…
Although the dangers posed by the Candiru or Toothpick fish are certainly exaggerated, it really can embed itself in the human urethra as this case described by Dr Samad Anoar demonstrates. All things considered, I suggest resisting the urge to urinate in the Amazon should the opportunity arise.
Visit The Poison Review for an excellent review article on the Candiru.
About Chris Nickson
[...] stones.calculus -- the branch of mathematics that shares its name with the medical term for stone.candiru -- the fish notorious for lodging itself in the urethra of unwitting victims who choose to urinate [...]