Any kind of untreated vaginal infection can lead to PID...
From what I'm seeing -- in sources like the CDC (http://www.cdc.gov/std/PID/STDFact-PID.htm#howget) and the University of Maryland Medical Center (http://www.umm.edu/ency/article/000888.htm) -- it looks like untreated bacterial infections can lead to PID, not necessarily all vaginal infections. For yeast infections, for example, PID is not mentioned as a possible complication (http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/001511.htm#Complications).
Re: BV
From what I'm seeing -- in sources like the CDC (http://www.cdc.gov/std/PID/STDFact-PID.htm#howget) and the University of Maryland Medical Center (http://www.umm.edu/ency/article/000888.htm) -- it looks like untreated bacterial infections can lead to PID, not necessarily all vaginal infections. For yeast infections, for example, PID is not mentioned as a possible complication (http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/001511.htm#Complications).