As is usual diagnosis was quite slow - though in this case his doctors were pretty sharp and may have identified the problem quicker than perhaps many others would have, perhaps others not having access to state of the art equipment.
As a result the infection is usually well established before treatment begins. In this case Marcus suffered the loss of sight in one eye at one point and the fungus had infected his brain but his resilience is remarkable and he maintained a positive attitude throughout.
Marcus is now back playing football. Read his remarkable story in the Los Angeles Times here