Overview of human clonorchiasis sinensis in China

The objective of the survey was to determine the current status, trends and transmission factors for Clonorchis sinensis infection in China and to provide updated information for development control strategies. This was part of a nationwide survey of major human parasitic diseases carried out during 2000-2002 sampled by the stratified randomized cluster sampling method. Fecal examination was conducted using the Kato-Katz thick smear method and egg count per gram of feces (EPG) was determined for the egg-positive patients. A questionnaire and a case-control study were applied to analyze the transmission factors for C. sinensis infection. The overall prevalence rate of C. sinensis infection was 0.58% in 356,629 residents from 688 sampled pilot sites in 31 provinces, autonomous regions and municipalities (PAM) of China. The infection rates of C. sinensis in Guangdong, Jilin, Guangxi Zhuang autonomous region, Anhui and Heilongjiang were higher than the other PAM, they were 5.35, 4.77, 3.71, 0.67 and 0.48%, respectively. In Guangxi, moderate and heavy infections were found in 29.14% and 11.52%, respectively, of the total infected. Heavy infections were not found in any of the other provinces except for 2 heavily infected cases in Heilongjiang. The prevalence rate increased with age for residents aged < 35 years and remained at high levels in those aged 25-60 years. The infection rate in males was 1.64 times that of females. The C. sinensis egg positivity rates in fishermen, businessmen, physicians and teachers were higher than others. Among the 38 ethnic groups, the prevalences in the Han (3.20%) and the Zhuang (3.15%) were the highest; no cases were found among the Zang, Miao, Man and other 29 ethnic groups. Significant differences in prevalences were also found among counties of different economic levels. C. sinensis infection is prevalent in hilly and plains regions of northeast and southcentral China, representing two highly endemic areas in the North and the South. An increasing trend in prevalence was seen in endemic areas. The infection was mainly detected in young and middle aged males. A higher prevalence was observed in those with a better education and a higher income. Consumption of raw (or under-cooked) fresh water fish or shrimp were the main risk factors responsible for transmission of the parasite.     

江西省人群蛔虫感染的现状

１９８８—１９８９年对我省６个片区，２３个县、市中的１００个调查点５２０４２人进行了粪检，蛔虫总感染率为７１．２％。男、女感染率分别为６９％（１８０７０／２６１８８）和７３．４％（１８９７７／２５８５４）。经χ２检验，两者间差别具有显著意义（χ２＝１２２．７７３３，Ｐ＜０．０１）。５岁以下年龄组感染率为６２．６％，虫卵计数，ＥＰＧ随年龄增长有明显下降趋势。８０％的抽查县的人群蛔虫感染率＞６０％，属重流行区。但根据虫卵计数，６８．９％的蛔虫感染者属轻度。     

广西人体华支睾吸虫感染现状调查分析

目的了解广西人群华支睾吸虫病流行现状和态势。方法按流行程度和水系流域进行分层整群随机抽样。用改良加藤厚涂片法粪检虫卵并计数。结果调查了9个县(市)27个点13990人,华支睾吸虫平均感染率为9.76%,平均EPG为1083,有6个县(市)查出感染者,其中3个县感染率超过20%。男性平均感染率和EPG分别为13.09%和1320;女性分别为5.89%和658,差异均有显著性。各年龄组人群均有感染,以成人感染为重。蒙古族居民感染率最高,为16.67%;汉族感染率为11.56%,高于壮族的8.17%;壮族感染者EPG最高,为1470。职业分布以医生、教师、农民和行政干部感染为重。结论1989年以来广西华支睾吸虫感染率显著上升,疫情快速蔓延,已经成为一个严重的公共卫生问题,应积极开展综合性防治工作。     

上海市浦东新区人群寄生虫感染的现状

人体肠道寄生虫在上海市浦东新区是一个重要的公共卫生问题。5个调查点一次粪检共查2714人,总感染率为56.2％,共检出7种寄生虫。蛔虫、鞭虫、蛲虫在所有的调查点均有流行;钩虫和结肠内阿米巴在大部分地区为轻度流行。 鞭虫的感染率为14.2-69.4％,4/5的调查点属中、重度流行区;蛔虫的感染率为7.3-60.8％,前者的感染率显著高于后者,其原因有待进一步研究。根据虫卵计数,大部分蛔虫、鞭虫感染属轻度。乡村居民肠道寄生虫感染远高于城镇,性别间无显著差异。按年龄分析表明蛔虫和鞭虫感染率均以10—14岁年龄组为最高,60岁以上年龄组呈下降趋势。     

广西人体重要寄生虫病现状调查

目的了解广西人体重要寄生虫病的流行现状和流行因素。方法按照全国人体重要寄生虫病现状调查的抽样方法进行抽样;粪便虫卵检查采用改良加藤厚涂片法、蛲虫卵检查采用透明胶纸拭肛法,血清学检查采用ELISA方法,并进行绦/囊虫病问卷调查。结果土源性线虫（钩、蛔、鞭、蛲）、华支睾吸虫总感染率为44.23%,检出7种虫种;其中,钩虫、蛔虫、鞭虫、蛲虫、华支睾吸虫感染率分别为18.52%、23.25%、11.37%、19.85%和3.71%。桂东、桂南地区总感染率较高（59.72%、47.98%）;学生总感染率（45.69%）较其他职业人群高;瑶族人群总感染率（76.77%）较其他民族高。≤15岁组人群蛔虫感染率较高,钩虫感染率随年龄的增加而增加,鞭虫感染者主要为5～15岁儿童。绦虫病主要集中在桂北和桂中的少数民族地区,以融水县绦虫感染率最高（8.46%）。结论广西人群土源性线虫感染率与12年前比较有较大幅度下降,但仍然处于较高水平,桂东、桂南地区感染率较高;食源性寄生虫感染呈上升趋势。     

医院就诊患者华支睾吸虫感染及临床特征分析

目的了解医院就诊患者华支睾吸虫感染情况及临床特点,为采取相应的防治措施提供依据。方法对2010～2011年17 584例就诊患者进行粪检,并分析华支睾吸虫虫卵阳性者的感染情况及实验室检测结果。结果受检者中华支睾吸虫感染2 043例,感染率11.62%,其中男性感染率为18.74%,女性为2.99%,男性显著高于女性(χ2=1052.15,P<0.01),30～岁组感染率最高,为22.15%;民族分布以壮族感染率最高,为29.98%;职业分布以农民感染率最高,为20.06%;有明显症状者1 735例(84.92%);实验室辅助检查中,74.94%感染者(1531例)有嗜酸性粒细胞升高,83.95%(1 715例)感染者有谷氨酰转移酶升高。华支睾吸虫感染者中62.41%有明确的食鱼生史,29.86%食过半生鱼虾。结论医院就诊者华支睾吸虫感染率较高,感染人群分布有明显差异性,应针对易感人群加强宣教等防治工作;对有食鱼生史且伴有嗜酸性粒细胞和谷氨酰转移酶增高患者,应粪检虫卵,以免漏诊。     

河南省人群肠道寄生虫感染分析

目的 了解河南省人群肠道寄生虫感染的流行态势,制定现阶段寄生虫病防治策略。 方法 按照《全国人体重要寄生虫病现状调查》实施细则规定方法和要求,选择安阳市郊区和郸城县6个调查点。 结果 1990年调查安阳市郊人群肠道寄生虫感染率36.23％,发现12种肠道寄生虫,多虫感染者142例,蛔虫感染者平均EPG 1794.69;2002年调查人群感染率为4.11％,未发现多虫感染者,EPG为548.88;1990年郸城县人群感染率77.87％,2002年降为27.26%,人群查出的肠道寄生虫也由12种减为10种,多虫感染者由816例降为53例,人群蛔虫EPG由2 515.49降为1 124.90。 结论 河南省人群寄生虫感染率或度呈总体下降趋势,这与经济的发展、人群文化教育水平的提升、卫生意识的培养、环境条件的改善及防治措施的实施密不可分,但不同地区下降幅度不同,低年龄组仍是受寄生虫感染的高危人群。     

Prevalence and some risk factors of Giardia duodenalis infection in a rural community in Malaysia

A study on prevalence and risk factors of Giardia duodenalis infection was conducted in rural communities of Malaysia. A total of 917 individuals between 2-70 years old (431 males and 486 females), participated in this study. The overall prevalence of G. duodenalis infection was 19.2%. The prevalence was significantly different between different age groups, but not genders. Our study indicated that age < or = 12 years old and the presence of family members infected with G. duodenalis were the risk factors of infection. Person-to-person contact within the family members was the possible mode of transmission. Health education on personal hygiene, together with the treatment of the infected people, may help in reducing and controlling this infection in these communities.     

山东省华支睾吸虫病防治40年效果

目的观察40年来山东省华支睾吸虫病防治效果。方法利用山东省历年华支睾吸虫病调查及年度工作资料,进行回顾性分析。结果1960-1970年代,全省共107个县有华支睾吸虫病流行,人群感染率为1.51%,85.70%的感染者为15岁以下儿童。经过40年的综合防治及进入1980年代以后天气持续干旱少雨,85.00%的沟渠、坑塘已断流干涸,90.00%以上河水受到工业废水的污染,使华支睾吸虫中间宿主鱼、螺的生存条件和数量明显减少;因全民卫生知识的普及,97.90%的人改变了生食或半生不熟的食鱼方式,减少了感染机会。至2003年人群感染率降至0.04%;95.60%的村感染率降至1.00%以下;60.00%的流行县未再查出感染者。结论山东省华支睾吸虫病的流行范围逐年缩小,人群感染率降到历史最低水平,基本达到了控制该病的传播流行。     

日本血吸虫感染度对个体内虫卵计量变异的影响

目的 观察日本血吸虫感染度对个体内虫卵计量变异的影响。 方法 以血吸虫病流行区江西省星子县渚溪村常住居民为对象，采用改良加藤法（Kato-Katz）连续7次重复检测其粪便中虫卵，每次涂制粪样厚片2张，任1张涂片查出虫卵即为阳性，完成者570人。用变异系数（CV）比较个体内变异，以年龄、性别、职业、感染度为分组因素，了解各组间的个体内变异。 结果 随着检测次数的增加，阳性检出率逐渐升高，7次累计阳性率比单次平均阳性率提高23.5%（P<0.01）。累计阳性者感染度随检测次数增加而逐渐下降，单次阳性者平均感染度（EPG）（111.06）高于7次累计感染度（42.51）。累计人群感染度随检测次数增加而逐渐升高，单次检测人群平均感染度（EPG）（4.78）低于7次累计感染度（8.75）。个体内变异，女性大于男性（P<0.05）。0～9岁组大于其他年龄组（P<0.05），其他各年龄组间差异无显著性（P>0.05）。渔民组低于其他职业组（P<0.05），其他各职业组间差异无显著性（P>0.05）。以感染度为分组因素，随着感染度的增加，个体内变异程度逐渐降低（r=-0.717， P<0.01），呈负相关。以感染度为分层因素进行分层分析，感染度相同，不同性别、年龄、职业组间的变异系数差异均无显著性（P>0.05）。 结论 改良Kato-Katz法检测血吸虫卵，单次检测结果明显低于实际感染率和人群感染度。感染度是影响虫卵计量个体内变异的根本原因。     

山东省华支睾吸虫病防治40年回顾

目的回顾40年来全省华支睾吸虫病防治取得的成绩,找出存在的问题,提出今后工作设想。方法利用我省历年华支睾吸虫病调查及年度工作总结资料,进行回顾性分析。结果!60￣70年代,全省共107个县有华支睾吸虫病的传播流行。人群感染率为1.51%,村感染率为1%￣30%,85.7%的感染者为15岁以下少年儿童。经过40年的综合防治及进入80年代以后天气持续干旱少雨,85%的沟渠、坑塘己断流干涸,90%以上河水受到工业废水的污染,使华支睾吸虫中间宿主鱼、螺的生存条件和数量明显减少;因全民卫生知识的普及,97.9%的人改变了生吃或半生不熟的食鱼方式,而减少了感染机会。至2003年人群感染率降至0.04%;95.60%的村感染率降至1%以下;60%的流行县未再查出感染者。结论山东省华支睾吸虫病的传播流行条件日渐减少,其流行范围逐年缩小,人群感染率降到历史最低水平,基本达到控制该病传播流行的目的。     

Seroprevalence and risk factors for hepatitis B virus infection among general population in Northern India

BACKGROUND: Infection with hepatitis-B virus has been a significant cause of morbidity claiming more than a million lives every year. Epidemiological data reveals that there are 360 million carriers of hepatitis-B virus throughout the globe and 78% of the world populations' hail from Asia. Though several studies from Indian sub-continent have provided an estimate of the prevalence of this viral infection, there exist only few studies, which reflect the status in the general population. AIM: The present study was designed to investigate the prevalence of hepatitis-B infection in North Indian general population. METHODS: The study population comprised of 20,000 healthy blood donors who were screened for hepatitis-B surface antigen (HBsAg) status using third generation ELISA kit. Seroprevalence rate of seropositive donors was calculated and stratified by age, sex and blood groups. Statistical analysis was performed using tests of proportions, chi-square and confidence interval. RESULTS: The study showed that out of 20,000 donors, 450 (2.25%) were HBsAg positive (95% confidence interval (CI), 2.0445-2.4554). Higher prevalence of HbsAg was found among males (440/19235) than females (10/765). The age specific prevalence rose from 1.78% (108/6058) in donors aged 19-25 years to a maximum of 3.03% (96/3161) in donors aged 35-45 years and decreased in older age groups. The peaks were detected in male donors aged 35-45 years and in females aged 25-35 years. Rh-negative blood group donors (21/873) and Rh-positive group donors (429/19127) had almost equivalent prevalence rates of HBsAg. HBsAg was more prevalent in blood group B donors (174/7426) and less prevalent in AB blood group donors (38/2032). CONCLUSION: It was found that variables including gender and age were significantly associated with HBsAg positivity. HBsAg positivity in our population was statistically not associated with ABO blood groups.     

江西省人体华支睾吸虫感染现状分析

目的了解江西省华支睾吸虫病流行现状和态势。方法按照江西省第3次人体重点寄生虫感染现状调查方案,以生态区为基础,按照经济条件和地理方位进行分层整群抽样,农村地区华支睾吸虫调查与土源性线虫调查一并进行,城镇地区以随机整群抽样法进行调查。共抽取全省32个县92个调查点进行调查,用改良加藤厚涂片法粪检虫卵并计数,抽取部分人群进行健康知识问卷。结果全省共调查23 606人,华支睾吸虫感染者138人,感染率为0.58%,以轻度感染为主,感染者主要集中于信丰县,共124人,其余各地有散在感染者。信丰县调查的851人中,除0~岁组无感染者外,其余各年龄组均有感染者,70~岁组感染率最高(24.00%);男性感染率(20.29%)高于女性感染率(6.25%),差异有统计学意义(P0.01);文化程度分布以高中、中专学历人群感染率最高(31.48%);职业分布以干部等公职人员最高(39.39%);感染途径中,有生吃鱼、虾史人群感染率较高(33.15%)。结论江西省华支睾吸虫感染除信丰县呈现区域聚集性外,其余呈现散发分布,有必要继续开展全省寄生虫病筛查,同时要对信丰县华支睾吸虫病流行区加强综合性防治。     

Seroepidemiologic study of Leishmania infantum infection in Castilla-Leon, Spain

Leishmaniasis has increased in importance in recent years because infection with human immunodeficiency virus (HIV) has emerged as a risk factor for this disease. However, the actual prevalence of leishmaniasis in the general population of Spain is unknown. We present a study of the seroprevalence of infection with Leishmania infantum in the general population of Castilla-Leon, Spain. A random sample of individuals presenting to health care clinics (4,825 sera) and of HIV-infected patients in the autonomous community of Castilla-Leon was collected in 1996. The sero-prevalence of antibodies to L. infantum was determined by an indirect enzyme immunoassay and found to be 4.9% in the general population. There was a significant increase in seroprevalence with age (P = 0.001), from 3.96% in those 14-20 years old to 7.2% in those > 70 years old. There were no significant differences between women and men (5.0% versus 4.9%; P = 0.9534). Seroprevalence was significantly higher in people from rural areas than in those from cities (6.0% versus 3.4%; P = 0.001). Patients infected with HIV had a seroprevalence for L. infantum of 64.0%. No differences were observed between women and men, and prevalence did not increase with age.     

广东省华支睾吸虫病流行现状调查和分析

目的了解广东省华支睾吸虫病流行现状和态势。方法在全省原63个流行县（市）按流行程度和水系流域进行分层随机整群抽样，用改良加藤厚涂片法粪检虫卵并计数。结果全省调查9个县（市）27个点13876人，华支睾吸虫平均感染率为16．42％，平均克粪虫卵数（EPG）为359。有8个县市查出感染者，其中3个县感染率超过20％。平均感染率男性18．92％，女性13．89％，差异有显著性（x^2=616．7，P〈0．01）。各年龄组均有感染，以成人感染为重（感染率19．38％～27．42％）。职业分布以渔民和商人感染最重（感染率32．69％）。结论广东省华支睾吸虫病流行范围广、感染率高，已经成为一个严重的公共卫生问题，应积极开展综合性防控工作。     

The prevalence of antibody to human parvovirus B19 in Rio de Janeiro, Brazil

During 1985 and 1986 serum samples were collected from the Rio de Janeiro population and examined for the presence of IgG antibody to human parvovirus B19. No difference in prevalence was found between males and females. Antibody prevalence rose from 35% in children less than five years old to almost 80% in children aged eleven to fifteen years. The antibody prevalence in individuals over 50 years old was over 90%.     

Seroprevalence of anti-Helicobacter pylori and anti-CagA antibodies among healthy children according to age, sex, ABO blood groups and Rh status in south-east of Iran.

Background/aims: The aim of this study was to evaluate the seroprevalence of anti-Helicobacter pylori (H. pylori) and anticytotoxin associated antigen A (CagA) antibodies in healthy children and to investigate the relation with age, sex, ABO blood groups and Rh status. Methods: Serum samples from 386 children (187 males, 199 females), aged 1-15 years, were tested for the presence of antibody to H. pylori and its virulence factor (CagA) by use of ELISA. ABO blood grouping was also done by hemagglutination test. Results: The overall seroprevalence of H. pylori infection was 46.6%. The prevalence of anti-H. pylori antibody was significantly (p<0.05) higher in males (51.9%) compared to females (41.7%). The prevalence of anti-CagA antibody in infected children was 72.8%. Although the prevalence of anti-CagA antibody was higher in males (78.4%) compared to females (66.3%), the difference was not statistically significant (p=0.07). In age subgroups of 1-5 years, 6-10 years and 11-15 years, the prevalence of anti-H. pylori was 37.6%, 46.9% and 54.9% and in infected children, the prevalence and the mean titer of anti-CagA antibody were 63.8%, 75.94 Uarb/ml; 75%, children acquire H. pylori infection. Anti-CagA common in the children. The seroprevalences of and anti-CagA antibodies were higher in males with age. However, the mean titer of anti-CagA decreased with increasing age. ABO blood groups influence the prevalence of H. pylori infection, especially gender..     

Prevalence of antibodies against hepatitis C virus in the elderly: a seroepidemiological study in a nursing home and in an open population. The Collaborative Group

BACKGROUND: The prevalence of antibodies against hepatitis C virus (anti-HCV) increases in the general population with advancing age. Several discrepancies exist in the epidemiology of HCV, however, when selected elderly population groups are tested. OBJECTIVE: To evaluate the HCV prevalence in two groups of elderly people living in the same geopgraphical area of northeast Italy, i.e., one including residents of a nursing home, the other including subjects living at home. METHODS: The overall sample included 496 subjects (mean age 79.31 +/- 8.9 years); 288 were in a nursing home, and 208 were living at home. Enrollment in the latter group was based on all subjects over 65 years old listed under the public health service in the same district. The overall rate of adhesion to the study was 90%. Each subject was administered an anonymous questionnaire testing sociodemographic data and risk factors for HCV infection. Serological tests included: anti-HCV and hepatitis B virus serum markers. Multiple logistic regression analysis was performed to evaluate risk factors for anti-HCV positivity. RESULTS: Anti-HCV positivity was found in 34 of 288 (11.8%) elderly in the nursing home and in 23 of 208 (11.1%) in the open population. When the total population was considered, females exhibited a significantly a higher prevalence of anti-HCV than males (13.4 vs. 7.5%, p < 0.05). In both males and females, the highers rate of anti-HCV prevalence was found among the 75- to 79-year-old subjects. A decline in anti-HCV prevalence was observed in the very old subjects (over 80 years of age). None of the anti-HCV-positive subjects was found to be coinfected with hepatitis B surface antigen. However, multiple logistic regression analysis identified the age group between 70 and 79 years, female gender, and positivity for antihepatitis B surface antigen and/or antihepatitis B core antigen as independent variables significantly associated with HCV prevalence. CONCLUSIONS: The prevalence of anti-HCV proved identical among elderly people living in the nursing home or at home, suggesting that nursing homes do not represent a risk factor for HCV infections; the significant association between HCV prevalence and antihepatitis B surface antigen and/or antihepatitis B core antigen positivity supports a common route of transmission of the two viruses; these findings would suggest that there was an epidemic of HCV infection during the Second World War and in the years immediately afterwards.     

湖北省血吸虫病3次抽样调查疫情对比分析

目的　掌握湖北省血吸虫病疫情变化情况 ,为制定防治规划提供科学依据。　方法　采用分层整群随机抽样法抽取行政村 ,对人、畜进行血吸虫粪检查病 ,用Epi info软件对 3次抽样调查结果进行统计分析。　结果　 3次抽样调查居民血吸虫感染率分别为 13 .5 4%、7.19%、4.77% ,病人感染度 (EPG) 1989、1995和 2 0 0 1年算术均数分别为 5 1.97、3 6.85、3 4.5 3 ,人群感染度 (EPG)算术均数分别为 7.0 4、2 .65、1.65 ,耕牛感染率分别为 18.71%、14 .98%、9.80 % ,均呈下降趋势。按年龄分组 ,5 0～ 60岁组病人感染度、人群感染度下降幅度最小 ,且 2 0 0 1年该组病人感染度和人群感染度在各年龄组中最大 ,感染率也较高。各职业中农民、渔民、船民感染率高 ,感染度大 ,且渔民中的病人感染度呈上升趋势。丘陵地区居民感染率 1995年、2 0 0 1年和 1989年相比均上升 ,耕牛感染率也呈上升趋势。　结论　湖北省血吸虫病疫情总体呈下降趋势 ,但高年龄组居民、农民、渔民、船民血吸虫感染仍较严重。丘陵地带的疫情呈上升趋势。     

全国人体重要寄生虫病现状调查报告

目的为了解和分析我国人体重要寄生虫病的流行现状和态势,评估近十年来的防治效果,并为制定防治对策提供科学依据,卫生部于2001年6月～2004年底在全国(除台湾、香港、澳门外)进行了人体重要寄生虫病现状调查.方法按照对总体率进行估计的随机抽样样本量计算公式,确定全国调查的样本量及各省(区、市)调查的样本量,然后根据地理位置和经济条件这两个特征分层整群随机抽样的方法,分三步抽样,分别到县(市)、乡(镇)和点.在已知有华支睾吸虫流行的27省(区)同时另行抽样作"流行区调查",样本量为217 829.土源性线虫、带绦虫和华支睾吸虫感染等采用病原学检查,棘球蚴病、囊尾蚴病(囊虫病)、并殖吸虫病、旋毛虫病和弓形虫病以血清学检查为主.结果以病原学检查方法在全国31个省(区、市)共检查356 629人,查出感染蠕虫26种,其中福建发现的东方次睾吸虫和埃及棘口吸虫为国内外人体感染首次报告,广西发现的扇棘单睾吸虫为国内人体感染首次报告.蠕虫总感染率为21.74%,其中土源性线虫感染率为19.56%(包括钩虫6.12%、蛔虫12.72%、鞭虫4.63%),推算全国感染土源性线虫人数约为1.29亿(钩虫、蛔虫、鞭虫感染人数分别约为3 930万、8 593万、2 909万);带绦虫感染率为0.28%,推算全国感染带绦虫人数约为55万;华支睾吸虫感染率为0.58%;流行区(27省、区、市)华支睾吸虫感染率为2.40%,推算感染华支睾吸虫人数约为1 249万.12岁以下儿童蛲虫感染率为10.28%.棘球蚴病、囊尾蚴病、并殖吸虫病、旋毛虫病和弓形虫病的血清阳性率分别为12.04%(4 796/39 826)、0.58%(553/96008)、1.71%(1 163/68 209)、3.38%(3 149/93239)和7.88%(3 737/47 444).结论本次调查结果与1990年全国性调查的相比,钩虫、蛔虫、鞭虫等土源性线虫感染率分别下降60.72%、71.29%和73.60%,感染人数显著减少.广东、广西、吉林等3省(区)的华支睾吸虫感染率明显上升,分别为182%、164%和630%.四川、西藏两省(区)的带绦虫感染率上升幅度最为明显,分别为98%和97%.棘球蚴病在西部地区流行仍较严重.许多寄生虫病仍在农村和牧区广为流行,农、牧民的寄生虫感染率、患病率较高,并导致一定的病死率,尤其对女性和儿童.