Medela For Stretch Marks Question ...anyone With Medical Experience?

Question ...anyone with medical experience? - medela for stretch marks

Okay, so I wanted a breast pump, from craigslist.org .. is used, I know many people buy, because I can not pay $ 300 for the pump, but I use pay $ 75, a version of the bomb ... but still Medela breast pump, and said he should not share it, because the previous owner could be a kind of diseases such as HIV / AIDS, and although the milk does not flow through the engine is not that "particles of milk powder could" give the engine and then contain HIV / AIDS or disease, it makes no sense to me because I'm pretty sure that HIV / AIDS can live on his own body, right? I mean, I know it can be transmitted through breast milk, but the milk powder particles? That sounds like a band that has not been used in addition to pump in more than a year, so that the virusbut to be dead, I am right in thinking that?