Snake mites? If you have strong protocols in place ZERO. I have been breeding snakes for a decade and NEVER had mites with my current collection.
My protocols are simple
I quarantine and pre-treat for mite my new incoming addition regardless or where they come from
If I go to a show or a pet store when I come home I immediately remove all my cloth and shower and wash my hair before going near my snakes.
I do not purchase live feeders I breed my own
No one is allowed in my snake room especially people who own snakes.