This is Dr. David
there are normal benign bacteria on all surfaces on our skin and objects.
but most bacteria are not dangerous and don't cause infections.
drying the vibrator for 4 hours would kill most bacteria
I think you are asking if this vibrator could spread a sexually transmitted disease like chlamydia or gonorrhea or syphilis if used 4 hours before and chances are that it would not spread an infection like this after it was dried for 4 hours.
best to wash sex toys with soap and water after use and before use.
but I would not stress about contracting an STD from a vibrator used 4 hours before
let me know if you have other questions.
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