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ORIGINAL: SweetBobbie

Actually only a few viruses pass into the urine but there is at least a theoretical risk with blood borne infections such as HIV, Hep B or C but the actual viral counts in urine are small and you must have sores or abrasions in your mouth.  Of course sores and abrasions in the mouth are not uncommon either.  As far as the more common bladder infections go these cannot be transferred as the bacteria will not survive your stomach.  Medications do pass into the urine but in  dilute fashion usually not a problem with the exceptions of the penicillin family of anitbiotics which are actively secreted into the urine (why ampicillin is sooo good for bladder infections).  As for dilute vs concentrated, first morning urine is like a fine wine to me  the stronger the bettter.