This is simply not true.  Toenail fungus as well as foot fungus stays in the superficial layers of the skin and only travels naturally through skin to skin contact.  The fungus can be shared between toenails for instance with a nail clipper or pedicure tool, but this is not as common as you would think.    

TRUTH: Toenail fungus is only transmitted to other toenails or fingernails by skin to skin contact and does not go through your bloodstream.