Just from my own experience, avoiding foods containing cane sugar greatly reduces vulnerability to sore throats. Cranberry capsules can help to reduce vulnerability to UTIs. Echinacea 5000 mg once or twice a day can stop a threatening throat/chest infection. Medical grade honey is really helpful for mouth ulcers or sore throats.
Dx MDS RAEB 10% blasts + hypogammaglobulinemia, Sep 2011. Jan 2012 BMB - blasts down to 2% w/out treatment so BMT cancelled. Re-diagnosis RCMD. On watch and wait since Feb 2012. IVIg 5-weekly. BMB Feb 2014 - no blast transformation. 2018 still stable.