you will probably be just fine. hand-washing and intact skin (on your hands) is an excellent defense against the transmission of viruses. that was a nice act of kindness (the money not the lighter). it would be highly highly unlikely that this brief touching of the hands would result in you contracting any disease. don't be bummed out (pun intended).
can you kill an uncaught hepes viruse by washing your hands? . i was walking in town today and there was a bum at the gas station very dirty and it look as though he had oral herpes. he asked for change so i gave him some plus my lighter our hands touched briefly so i went home and washed my hands. i don't want to give herpes to my fiancé so i'm a little skittish about sex now.