求翻译：　　沙伊卜说，该疾病２０１１年４月首次在越南中部广义省出现，患者被发现有手部、脚部溃疡、四肢僵硬等症状，在严重病例中出现肝损伤。根据目前情况，该疾病仅在广义省内发生，世卫组织尚未收到越南其他地区或其他国家相关病例报告。世卫组织越南办公室将继续和越南有关部门保持密切合作。是什么意思？

Shayi Bo said that the disease in April 2011 for the first time in Vietnam's central Quang Ngai province, the patient was found to have hand, foot ulcers, stiffness and other symptoms in severe cases, liver damage. According to the present situation, the disease only occurred in a broad sense in the