I was in a party in valley of sorrows a while ago with a smn/whm? and a rdm/blm fighting raptors. We had a nin tank, so it didn't matter if he got diseased. but every once in a while the rdm or smn would get it, and we wern't high enough for /whm to have viruna, but spring water did the trick. good pt..
and NOTHING will remove weakened.. nothing but time that is.