Epidemiological survey on hydatid disease in livestock in Tibet Autonomous Region

Abstract

Abstract:

Objective To investigate the prevalence of hydatid disease and influencing factors in livestock in Tibet Autonomous Region. Methods A simple and stratified random sampling method was used to select villages of different types of production according to the proportions of populations in pastoral area, semi-agricultural and semi-pastoral area, agricultural area and town, from 63 counties in seven prefectures (cities) (Shigatse, Qamdo, Nagqu, Lhasa, Shannan, Nyingchi and Ali) of Tibet Autonomous Region. Ten sheep (pigs) or 5 cattle were selected in each village to examine cysts in liver and lung, accompanied by recording the animal age and number of cysts found. Twenty families were randomly selected in each village to collect basic information including householder name, family size, ethnicity, numbers of dogs, sheep and/or cattle raised, number of livestock slaughtered in each year and the slaughtering time, source of drinking water. Logistic regression analysis was performed using livestock having hydatid cyst(s) as dependent variable Y and using city, livestock type, tooth age and type of production as independent variable X. Results A total of 2 143 livestock were examined, comprising 995 cattle (46.43%), 1 047 sheep (48.86%), and 101 pigs (4.71%), and comprising 834 (38.92%) from pastoral areas, 922 (43.02%) from semi-agricultural and semi-pastoral area, 362 (16.89%) from agricultural area, and 25 (1.17%) from town. The infection rate of hydatid cysts in livestock was 13.21% (283/2 134), and that in sheep, cattle and pigs were 18.24% (191/1 047), 9.15% (91/995), 0.99% (1/101), respectively (χ² = 50.633, P < 0.01). The cysts were mainly distributed in liver (69.9%, 178/283). The infection rate was highest in Ali (28.82%, 66/229), and lowest in Nyingchi (0.71%, 1/140) (χ² = 123.946, P < 0.01). Among different tooth age groups, the infection rate was the highest in the age group of > 10 tooth age (18.85%, 33/175) (χ² = 14.488, P < 0.01). Among different production types, the highest infection rate was detected in pastoral area (17.03%, 142/834) and lowest in town (no livestock infected) (χ² = 26.316, P < 0.01). Of the 7 334 families surveyed, up to 6 722 raised livestock (91.7%), and 5 286 slaughtered livestock by themselves (72.1%), and the slaughter mainly occurred in November. Multivariate analysis showed that the infection rate of hydatid cysts in livestock was correlated with prefecture (city), species of livestock, tooth age, and type of production. Conclusion There is a high prevalence of hydatid disease in sheep and cattle in Tibet Autonomous Region. Comprehensive measures are needed to reduce the infection.

Key words: Hydatid disease, Livestock, Tibet Autonomous Region, Prevalence

CLC Number:

R532.32

Wang-jie SUOLANG, Wei-ping WU, Wang-jiu DANZHEN, Zhang-you LONG, Qu-zhen DANZENG, Zhao-hui LUO, Qu-zhen GONGSANG. Epidemiological survey on hydatid disease in livestock in Tibet Autonomous Region[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2018, 36(1): 30-34.

Figures/Tables 3

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References 27

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地区（市） Prefecture（City）	调查户数No. households surveyed	养牲畜户数 No. households raising livestock	羊 Sheep		牛 Cattle		猪 Pig		家庭自宰户数 No. households slaughtering livestock by themselves	家庭自宰率/%Percent of households slaughtering livestock by themselves /%	集中自宰峰值月份Month with a peak slaughtering
地区（市） Prefecture（City）	调查户数No. households surveyed	养牲畜户数 No. households raising livestock	户数 No. household	户均养羊数Average no. sheep per household	户数 No. household	户均养牛数Average no. cattle per household	户数 No. householdd	户均养猪数Average no. pigs per household	家庭自宰户数 No. households slaughtering livestock by themselves		集中自宰峰值月份Month with a peak slaughtering
拉萨市Lhasa	1 047	860	191	27.9	670	15.3	0	0	542	51.8	Nov.
昌都市Changdu	1 370	1 209	133	35.5	1 110	18.4	0	0	789	57.6	Nov.
山南市Shannan	960	898	515	23.2	834	7.0	0	0	654	68.1	Nov.
日喀则市Shigatse	1 926	1 839	1 445	70.5	1 749	12.3	0	0	1 617	84.0	Nov.
那曲地区Nagqu	1 082	1 010	427	109.4	885	34.8	0	0	890	82.3	Nov.
阿里地区Ali	445	422	360	133.3	264	16.0	0	0	403	90.6	Nov.
林芝市Nyingchi	504	484	20	9.6	372	16.0	188	8.0	391	77.6	Nov.
合计Total	7 334	6 722	3 091	58.4	5 884	17.1	188	8.0	5 286	72.1

特征Features		检查数/头 No. exam′d	感染数/头 No. infected	感染检出率/% Infection rate/%	χ²	P
地区（市） Prefecture(City)	那曲地区Nagqu	366	21	5.74	123.946	< 0.01
地区（市） Prefecture(City)	阿里地区Ali	229	66	28.82
	山南市Shannan	307	35	11.40
	拉萨市Lhasa	185	52	28.11
	昌都市Changdu	339	41	12.09
	日喀则市Shigatse	577	67	11.61
	林芝市Nyingchi	140	1	0.71
种类 Species	羊 Sheep	1 047	191	18.24	50.633	< 0.01
种类 Species	牛 Cattle	995	91	9.15
	猪 Pig	101	1	0.99
齿龄 Tooth age	< 5	765	75	9.80	14.488	< 0.01
齿龄 Tooth age	5~9	1 203	175	14.54
	≥ 10	175	33	18.85
生产类型 Type of production	牧区Pastoral area	834	142	17.03	26.316	< 0.01
生产类型 Type of production	半农半牧区Semi-agricultural and semi-pastoral area	922	115	12.47
	农区Agricultural area	362	26	7.18
	城镇Town	25	0	0

分析指标 Variable analysis		回归系数 B	标准误 S.E	统计量 Wals	P值 P value	OR值 OR value	95%的置信区间 95% CI
地区（市）	阿里地区Ali	4.030	1.014	15.794	< 0.01	56.282	(7.711, 410.780)
Prefecture(City)	拉萨市 Lhasa	3.995	1.017	150.439	< 0.01	54.346	(7.407, 398.744)
	昌都市Changdu	2.951	1.017	8.414	< 0.01	19.124	(2.604, 140.452)
	日喀则市 Shigatse	2.905	1.012	8.239	< 0.01	18.261	(2.513, 132.712)
	山南市Shannan	2.884	1.020	8.002	< 0.01	17.886	(2.452, 131.929)
	那曲地区Nagqu	2.135	1.028	4.311	< 0.05	8.451	(1.127, 63.509)
生产类型	牧区 Pastoral area	0.975	0.223	19.051	< 0.01	2.652	(1.711, 4.109)
Type of production	半农半牧Semi-agricultural and semi-pastoral area	0.611	0.227	7.258	< 0.01	1.842	(1.181, 2.872)
家畜类型	牛 Cattle	2.309	1.011	5.217	< 0.05	10.066	(1.388, 73.017)
Type of livestock	羊Sheep	3.105	1.008	9.486	< 0.01	22.313	(3.093, 160.959)
	齿龄组Tooth age	0.238	0.064	13.888	< 0.01	1.268	(1.119, 1.437)