Whose propensity?

"the high propensity " refers to the enteritis' high propensity?

Context:

When a patient with an immunodeficiency disease presents with enteritis there is frequently difficulty in deciding whether the condition is essentially infectious or autoimmune and, consequently, what treatment regimens are applicable. While a case of enteritis may not be autoimmune in origin, the high propensity toward developing autoimmunity can at least complicate many instances of primarily infectious enteritis. This dilemma arises especially when autoimmunity is implicated in immunodeficiencies in which there is a defect of thymus development leading to decrease in particular subsets of T cells, a problem likened to what is seen in patients with AIDS.