yes dromedaries can be infected with bluetongue virus but without clinical symptoms. Are you asking this question because you have encountered a one humped camel with a variety of clinical symptoms suggesting a possible sickness caused by epizootic hemorrhagic disease virus?
Dear Prof Aradaib, I do not have any literature reference on epizootic hemorrhagic disease virus in camels. However since EHD affect several ruminants species I would not be too surprised if camels may well be minimally susceptible: simply seroconvert. Because of "el Nino" late in 2014 and beginning 2015 there will be a lot of rainfall in eastern Africa so there will be a massive increase of the vectors of EHD (and RVF, bluetongue). At present there is a drought in many part of east Africa (perhaps in Sudan too ?) so in such areas camels that have been born this year are likely that they should not have been exposed to EHD vectors. A situation that eventual floods and associated booming number of orbivirus vectors will change drastically perhaps opening possibilities for investigation on EHD and camels.