CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES ›› 2017, Vol. 35 ›› Issue (2): 140-144.

• ORIGINAL ARTICLES • Previous Articles     Next Articles

An epidemiological survey on hydatid disease in Tibetan autonomous areas of Gansu Province

Dong WANG1,2, Yu FENG1, Fan LI1, Peng-fei GE1, Ting ZHANG2,*(), Wei HU2, Hong LIANG1, Guo-bing YANG1, Da-wei YU1, Cheng-ming YANG1, Jun-ke YANG1   

  1. 1 Gansu Center for Disease Control and Prevention, Lanzhou 730020, China
    2 National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Centre for Tropical Diseases; National Center for International Research on Tropical Diseases, Ministry of Science and Technology; Key Laboratory of Parasite and Vector Biology, Ministry of Health, Shanghai 200025,China
  • Received:2016-07-21 Online:2017-04-20 Published:2017-05-02
  • Contact: Ting ZHANG E-mail:tinazhang2007@163.com
  • Supported by:
    Supported by the Gansu Provincial Science and Technology Support Program(No. 1304FKCA120), the Open Project of Key Laboratory of Parasite and Vector Biology, Ministry of Health(No. WSBKTKT201305), the National Natural Science Foundation of China(No. 81201315)and the National Science and Technology Major Program(No. 2009ZX10004-302)

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Abstract:

Objective To investigate the prevalence of echinococcosis in 10 Tibetan autonomous prefectures(counties) of Gansu Province. Methods Stratified random sampling was carried out from September 2011 to June 2012, 16 villages for each. The subjects were examined by B ultrasonography. Statistics were performed using the SPSS 20.0 software. Data of prevalence were analyzed with χ2 test. Results A total of 37 815 residents were examined, and echinococcosis was found in all the surveyed sites with an average county-level prevalence rate of 0.59%(224/37 815) (0.05%-1.59%). The counties with prevalence of over 1% were Xiahe(1.59%, 64/4 019), Maqu(1.37%, 44/3 206) and Sunan(1.20%, 60/5 000). In the overall populations, the prevalence in males and females was 0.53%(108/2 0276) and 0.66%(116/17 539) respectively(χ2 = 2.647, P > 0.05), while in the Tibetan ethnic population, the prevalence showed a considerable difference(0.71% in females versus 0.46% in males, P < 0.05). There was also a significant difference by age(χ2 = 109.346, P < 0.05), with the lowest prevalence in the group of 20-30 years old(0.28%, 19/6 687), and highest in the group of > 80 years old(2.41%, 4/166). Overall, the prevalence showed a trend of increase with ageing. There was no significant difference in prevalence among ethnicities(χ2 = 1.710, P > 0.05) though the Hui ethnicity seemed higher(0.92%, 5/546). The prevalence varied significantly among residents with different occupations(χ2 = 33.345, P < 0.05), with businessmen ranking first(3.32%, 2/62). In this study, we identified 223 cystic echinococcosis cases and a case of alveolar echinococcosis. No mixed infection was found. Single-organ infection accounted for 98.21%, with a liver dominance(94.76%, 217/229). The single cyst type accounted for 81.75% (183/224). The proportion of multi-cyst type was higher in residents > 60 years old(28.57%, 22/77) than in those < 60 years old(12.93%, 19/147) (χ2 = 8.273, P< 0.05). Conclusions Cystic echinococcosis is present in all the counties surveyed, particularly in counties of Xiahe, Maqu and Sunan. Target populations are mainly females of Tibetan ethnicity, residents aged over 60 years, and merchants.

Key words: Hydatid disease, Epidemiological survey, Gansu Province, Tibetan autonomous region

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