EBV is liked to many other diseases. To quote wikipedia:

"EBV has also been implicated in several other diseases, including Burkitt's lymphoma,[58] hemophagocytic lymphohistiocytosis,[59] Hodgkin's lymphoma,[60] stomach cancer,[12][61] nasopharyngeal carcinoma,[62] multiple sclerosis,[15][16][63][17] and lymphomatoid granulomatosis.[64]"

Burkitt's lymphoma is an oddball cancer in which growth is so fast treatment should begin almost immediately.