Investigation and response of the first imported Chikungunya fever case in Tengchong, Yunnan

Abstract

Objective To analyse the discovery, diagnosis, treatment, epidemiological investigation and response of the first Chikungunya fever case in Tengchong City, providing references for prevention and control of Chikungunya fever.

Methods Blood was collected from a suspected case of Chikungunya fever reported by Tengchong People’s Hospital, and the nucleic acid of Chikungunya virus was detected by real-time PCR. Investigation of epidemiological, clinical manifestations, diagnosis and treatment, and Aedes mosquitoes were carried out. Environmental regulation, mosquito control, mosquito isolation treatment was adopted. The patient’s companions, close contacts and family members were tracked to control the outbreak.

Results The patient had a fever and headache and arthralgia on July 31, 2019. Then the patient had erythra on August 1, 2019. The nucleic acid test of Chikungunya fever virus was positive. There was a visit to the patient’s relatives in Myanmar. The patient was cured after symptomatic treatments. People with suspected symptoms were not been found in his companions, close contacts and people around his house. Aedes albopictus was captured in Yuejiazhai, Houqiao and Diantan Port, while Aedes aegypti was not found. Breteau Index was 4.00, 9.80, 3.85 respectively. Spraying for mosquito control was carried out in more than 90 households, covering 23 000 m ². After the disposal, Breteau Index was all under 5.

Conclusion The case was the first imported Chikungunya fever in Tengchong City. The investigation and response were timely and effective, and no secondary cases occurred.

Abstract

摘要： 目的 分析腾冲市1例基孔肯雅热病例的发现、诊断、个案调查和处置情况，为基孔肯雅病热的防控提供依据。 方法对腾冲市人民医院报告的1例疑似基孔肯雅热病例采集患者血液，用Real-time PCR法进行基孔肯雅病毒核酸检测;开展流行病学、临床表现及诊疗过程、媒介伊蚊调查;采取环境整治、灭蚊、防蚊隔离治疗，追踪同行人员、密切接触者及家庭周围人群控制疫情。 结果患者2019年7月31日出现发热、头疼、关节疼痛,8月1日出现皮疹，基孔肯雅热病毒核酸检测阳性，发病前有缅甸探亲史，确认为缅甸输人性病例，经对症支持治疗痊愈;同行人员、密切接触者及家庭周围人群未发现疑似症状者;滇滩岳家寨、猴桥及滇滩口岸均捕获白纹伊蚊，未发现埃及伊蚊，布雷图指数(BI)分别为4.00、9.80、3.85;灭蚊喷洒90余户，面积2.3万m ²,处置后，布雷图指数(BI)控制在5以下。 结论病例为腾冲市首例输人性基孔肯雅热，调查处置及时有效，未发生继发病例。