He was visited by an anaesthetist friend of ours during the day who took the time to explain what all his other medication is for - it seems to be a mixture of anti everything - anti-sickness, fungal, viral, bacterial etc. So they are doing all that can be done to help prevent nasty organisms taking hold!
Tomorrow, the plan is to administer two one hourly doses of Cytarabine - one in the morning and one in the evening. We'll wait to see how he feels after this.