Which of the following symptoms is NOT associated with OMUS?

Ocular-Mucosal-Urticarial Syndrome (OMUS) is characterized by symptoms primarily affecting the eyes, mucosal surfaces, and skin, particularly urticaria (hives). The symptoms typically include dizziness, fatigue, and shortness of breath, which can be manifestations of systemic allergic reactions or other underlying conditions related to OMUS.

Rash, while it can cover a range of skin reactions, is not a specific symptom associated directly with OMUS in the context of this question. The term "rash" tends to be more generalized and includes various possible skin reactions. In contrast, the other symptoms listed—dizziness, fatigue, and shortness of breath—are more commonly related to the allergic or systemic aspects of OMUS. Thus, the absence of rash as a specific symptom correctly identifies it as not being associated with OMUS in the same manner as the other symptoms.