It takes time...
It takes time, be patient and hopeful. My son was diagnosed with AA in Feb 2009 at age 11. He received ATG and like your son he had frequent platelet transfusions for almost four months. After than he had nupugen injections for two months and since then he has been taking cyclosporine everyday and bactrim on the weekends (in addition to blood pressure medicine). His platelet counts:
Feb 2009 = 4(000) on day of diagnosis
Dec 2009 = 21(000)
Dec 2010 = 65(000)
Dec 2011 = 96(000)
Dec 2012 = 115(000)
And he's been between 104 and 115 since then. I think he's finally plateaued but we feel like its a safe level, and all his other counts are great. Hang in there!
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