My guess would be pneumonia by far over any parasite. Pneumonia is one of the largest killers in the cervid industry and right around that 30 day period for fawns symptoms can begin to arise (it can happen sooner, just what seems like optimum time). If you can get your hands on it I would do one of two things, administer either nuflor or baytril. I give nuflor at 3cc/100lbs IM and repeat in 48 hrs or 6cc/100lb SQ single dose. Baytril I will do 5cc/100lbs single does. So adjust based on your little guys weight. You can even give him some prevail or dexamethasome, do not do both as it is a deadly combination. Prevail will help him feel better, dex will boost the immune system. Hope I was of some help. Ryan