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M. I. Manrique-Poyato A. J. Muñoz-Pajares V. Loreto M. D. López-León J. Cabrero J. P. M. Camacho 《Chromosome research》2006,14(6):693-700
We have analysed B chromosome frequency for three consecutive years, B transmission rate at population and individual levels,
clutch size, egg fertility and embryo–adult viability in a natural population of the grasshopper Eyprepocnemis plorans containing two different B chromosome variants, i.e. B2 and B24, the second being derived from the first and having replaced it in nearby populations. From 2002 to 2003 the relative frequency
of both variants changed, although the differences did not reach significance. A mother–offspring analysis showed no significant
effect of any of the two B variants on clutch size, egg fertility or embryo–adult viability, but B24 was more efficiently transmitted than B2 through males from the 2002 season, which explains the observed frequency change. Controlled crosses, at individual level,
showed significant drive through some females for B24 but not for B2, suggesting that this difference in transmission rate might also be important for the substitution process. The analysis
of relative fitness for B2 and B24 carriers for all fitness components, as a whole, showed a significantly better performance of B24-carrying individuals, suggesting that the cumulative effect of these slight differences might contribute to the replacement
of B2 by B24.
Electronic Supplementary Material Supplementary material is available for this article at . 相似文献
3.
本文综述本校传染病学教研室1955~1995年间所取得的科研成果。内容包括10余种传染病与寄生虫病的临床和基础研究,其中以华支睾吸虫病、恙虫病等有广东特色的传染病以及伤寒、痢疾、病毒性肝炎等影响人民健康最普遍的传染病为重点。反映了建国以来各个时期本教研室对防治这些传染病所作的贡献。所取得的成果,相当一部分通过多年来的验证,已获得广大传染病工作者所认同或列为常规,部分已获得部委级奖励。现在重温这些成果,可能起承前启后的意义。 相似文献
4.
Sirima Kitvatanachai Pochong Rhongbutsri 《Asian Pacific journal of tropical medicine》2013,6(9):699-702
ObjectiveTo provide baseline information of parasitic infections in 3 suburban government schools, Lakhok subdistrict of Muang Pathum Thani, Thailand.MethodsThis study was conducted between May-June 2010 using simple direct smear and modified formalin ether and from a population of 1 253 in 3 suburban government schools.ResultsTotal samples of 202 registered and participated. The average of prevalence of infection from 3 schools was 13.9%, there were 13.7%, 14.3% and 13.9% in N, S and R school, respectively with no significant difference between schools (P>0.05). The infection rates did not show significant difference between genders (P>0.05). The highest rate of infection was 20.4% in Pathom 2 (8 years) students and the lowest was 4% in Pathom 1 (7 years) with statistically difference between age groups (P<0.05). The highest prevalence of pathogenic protozoa was Giardia lamblia (G. lamblia) which was found in 50% of infected cases, followed by 25% of Entamoeba histolytica (E. histolytica) and Blastocystis hominis (B. hominis). The highest prevalence of non-pathogenic protozoa was Endolimax nana (E. nana) which was found in 88.9%, followed by 11.1% of Entamoeba coli (E. coli). Mixed infections between Blastocystis hominis (B. hominis) and Endolimax nana (E. nana) were reported at 7.1%. The only helminthic infection found in this study area was hookworm, found in 1 student (3.8%). The formalin ether concentration technique showed a higher efficacy of detection (78%-100%) than the simple direct smear method (0%-50%).ConclusionsSurveillance of Protozoan infections may need to be focused on suburban areas. 相似文献
5.
《Taiwanese journal of obstetrics & gynecology》2014,53(3):392-396
ObjectiveTo investigate the possible causes of iatrogenic parasitic myoma and methods to prevent its occurrence.Case reportA 27-year-old nulliparous unmarried patient underwent laparoscopic myomectomy with morcellation for a submucosal myoma at the National Taiwan University Hospital (Taipei, Taiwan). Seven years later, an asymptomatic pelvic tumor was noted during a regular annual follow up. Two pelvic tumors were detected and excised by laparoscopic surgery. The masses were confirmed by histopathology to be cellular leiomyomas.ConclusionIn the past 7 years, the incidence of iatrogenic parasitic myomas has increased because of the increased use of minimally invasive surgery using a morcellator. Forty-one cases of iatrogenic parasitic myoma were reviewed from 23 published studies. Parasitic myoma frequently occurs in the dependent part of the abdominal cavity, which suggests seeding of myometrial tissues during morcellation. In situ morcellation and vigorous irrigation with concomitant changes in position may decrease the incidence of retained myoma tissue in the abdomen during surgery. 相似文献
6.
《Immunology》2017,150(4):389-396
Eukaryotic forms of life have been continually invaded by microbes and larger multicellular parasites, such as helminths. Over a billion years ago bacterial endosymbionts permanently colonized eukaryotic cells leading to recognized organelles with a distinct genetic lineage, such as mitochondria and chloroplasts. Colonization of our skin and mucosal surfaces with bacterial commensals is now known to be important for host health. However, the contribution of chronic virus and parasitic infections to immune homeostasis is being increasingly questioned. Persistent infection does not necessarily equate to exhibiting a chronic illness: healthy hosts (e.g. humans) have chronic viral and parasitic infections with no evidence of disease. Indeed, there are now examples of complex interactions between these microbes and hosts that seem to confer an advantage to the host at a particular time, suggesting that the relationship has progressed along an axis from parasitic to commensal to one of a mutualistic symbiosis. This concept is explored using examples from viruses and parasites, considering how the relationships may be not only detrimental but also beneficial to the human host. 相似文献
7.
目的 了解阳春市人体重点寄生虫感染状况及其影响因素,为制定符合当地实际的寄生虫防治措施提供科学依据.方法 采集3周岁以上常住居民粪便标本,采用改良加藤厚涂片法检测蛔虫、钩虫等重点寄生虫虫卵,同时采用透明胶纸法检查蛲虫虫卵,并对接受检查对象进行统一问卷调查.结果 共调查1 047人,查出感染者70人,总感染率为6.69%.蛔虫是主要的寄生虫感染虫种.0~岁年龄组儿童寄生虫感染情况较严重(x2=25.88,P<0.05).经济类型(x2=8.41,P<0.05)、文化程度(x2=34.30,P<0.05)、饮水习惯(x2=14.22,P<0.05)、洗手习惯(x2=9.95,P<0.05)及厕所类型(x2=12.21,P<0.05)是人群寄生虫感染的影响因素.结论 蛔虫是当地人体寄生虫感染的主要虫种,应针对重点地区、重点人群采取加大宣传、转变居民卫生习惯、促进农村改水改厕工程及改善生活环境相结合的综合性防治措施. 相似文献
8.
Summary Investigations were initiated to study the possible detection and measurement of coproantibodies in animals infected with a gastrointestinal nematode parasite. Faecal extracts, extracts of small intestinal mucosa and sera of rats infected with intestinal nematode Nippostrongylus brasiliensis were examined for total IgA, IgM and IgG levels and haemagglutinating and precipitating antibodies specific to parasite antigens over a 30-day-period following infection. It was found that in both faecal and mucosal extracts immunoglobulin concentrations increased after a primary infection. In faecal extracts there was a seven-fold increase of IgA, a three to six-fold increase of IgG and about a fifty-fold increase of IgM. Haemagglutinins in faecal extracts detected by adult worm excretory-secretory (ES) products and adult worm and infective larvae somatic extracts were observed from 3 days after infection (DAI). Haemagglutinins detected by ES products reached their highest titres on 11–12 DAI while those reacting with adult worm somatic extracts showed the highest level between IS and 19 DAI. A similar pattern of response was found in the antibody levels of the intestinal mucosa. Haemagglutinins detected in faeces during the first 12 DAI reacted with the same antigens as antibodies present in the sera at that time but coproantibodies from 18, 24 and 30 DAI were different from those circulating in sera at that stage of the infection. The results suggest that measurement of coproantibody levels may provide a convenient and useful index of local immune responses to gastrointestinal helminths. 相似文献
9.
Ocular lesions are frequently associated with different parasitic infections. The classes of infection include protozoa, nematodes, cestodes, and ectoparasites. Ocular parasitic infections can manifest in any part of the eye; the disease manifestations are frequently characterized as either posterior or anterior eye disease. Parasite-induced lesions may be due to damage directly caused by the parasite, indirect pathology caused by toxic products or the immune response initiated by infectious parasitism. This review characterized the parasite-induced lesions in the posterior segment of the eye. Prompt diagnosis and early treatment of these lesions can reduce ocular morbidity. The method of the literature search was conducted on PubMed, Elsevier Scopus database, and Google Scholar with no limitation on the year of publication databases. It was limited to English articles published for ocular lesions in clinical studies and was focused on parasitic infections of the eye. 相似文献
10.
Haarbrink M Terhell AJ Abadi K Asri M de Medeiros F Yazdanbakhsh M 《Tropical medicine & international health : TM & IH》1999,4(2):93-97
To assess whether antifilarial IgG4 can be used to study various epidemiological facets of filarial infections, we studied this isotype in 238 individuals resident in areas endemic for brugian filariasis, focusing on the differences between men and women. In the study area, the prevalence of microfilariae was 6.7% and the prevalence of antifilarial IgG4 was 49.2%. All microfilariae carriers were positive for antifilarial IgG4, whereas a proportion of the endemic normals (94/208) and clephantiasis patients (7/14) had IgG4 antibodies to filarial antigens. Data were analysed as a function of gender in distinct clinical groups and stratified for age. The prevalence of microfilariae was higher in males in all age groups, as reflected in significantly higher antifilarial IgG4 antibody levels compared to females. The prevalence of IgG4 increased to reach a plateau at the age of 30 years in both males and females. These results indicate that antifilarial IgG4 antibodies can reflect the differences in the extent of infection in males and females as measured by microfilarial counts, and that this parameter can be used for epidemiological assessments of filarial infection. 相似文献