Unusual site of presentation of W Bancrofti with various forms of filaria seen on cytology smears – Report of 2 cases

Abstract Filariasis is a major public health problem in tropical countries like India, China, Indonesia, Africa and the Far East. Aspiration cytology often helps in demonstration of microfilaria and its various forms, from uncommon diverse areas and in unusual clinical presentations like subcutaneous swelling caused by W.bancrofti in our cases. In our cases various forms of W.bancrofti were seen on cytology. Microfilria being most common form seen on cytology, adult worm, coiled forms (embryos) and ova seen less often. FNAC can be helpful in diagnosis of symptomatic as well as asymptomatic cases of lymphatic filariasis. During cytological evaluation of tissue fluids and aspirate from lesions of any part of the body, possibility of filariasis must be kept in mind as a possible differential diagnosis, particularly in endemic areas. This will help to give appropriate therapy to asymptomatic patients.

Discovery and biology of Schistosoma haematobium / 中国血吸虫病防治杂志

Schistosomiasis is a neglected tropical disease that severely threatens human health and affects the socioeconomic development. The causative agent that parasitizes in humans mainly involves Schistosoma japonicum,S. mansoni,S. haematobi-um,S. intercalatum and S. mekongi. As the firstly identified schistosome,S. haematobium infection is found to strongly correlate with bladder cancer. This paper mainly reviews the discovery,morphology and life cycle of S. haematobium.

Study of antagonistic effect of SWA and SEA of Schistosoma japonicum in mice with type 1 diabetes / 国际检验医学杂志

Objective To explore the antagonistic effect of Schistosoma japonicum soluble adult worm antigen (SWA)and solu-ble egg antigen (SEA)in the mice with type 1 diabetes.Methods The 24 successful modeling type 1 diabetes mice were randomly divided into three groups (A,B,C group,n=8).SWA and SEA of Schistosoma japonicum were prepared.Mice in A group were immunized by abdominal subcutaneous multi-point injection SWA.Mice in B group were immunized by abdominal subcutaneous multi-point injection SEA.And mice models of C group were immunized by PBS instead of antigen through abdominal subcutaneous injection.The mice got immunization once a week,a total of four times.4 weeks later,the mice were sacrificed,and serum speci-mens were collected for the determination of serum levels of IL-4 and IFN-γby double-antibody sandwich ELISA,while pancreas tissues were collected and the pathological changes were observed.Results The serum IL-4 level of B group [(23.87 ±4.85)pg/mL]was higher than C group [(4.39 ± 0.56 )pg/mL],with significant differences (P 0.05).The islet structure of mice in B group was not intact,however,the lymphocytic infiltration in B group was less than C group,and there was no lymphocytic infiltration in pancreatic islets in B group.Compared with C group,the pancreas of mice in A group did not have significant changes,lymphocytes infiltration was still visible in islets.The number of residual islet cells de-creased,and visible minority islet structure was destroyed.Conclusion SEA of Schistosoma japonicum has certain antagonism effect on type 1 diabetes in experimental mice.Its mechanism may be the reduction of Th1 response and the enhancement of Th2 response through increasing IL-4 level and decreasing IFN-γlevel.

Incidence and histopathology of encysted progenetic metacercaria of Clinostomum complanatum (Digenea：Clinostomidae) in Channa punctatus and its development in experimental host

Objective: To study the incidence of encysted progenetic metacercariae of Clinostomum complanatum (C. complanatum) in Channa punctatus (C. punctatus), associated histopathology and the experimental infection to laboratory chicken to obtain ovigerous adult worms. Methods:Live C. punctatus were brought from local fish market of Aligarh, India, dissected and examined on a monthly basis for the presence of C. complanatum cysts. For histochemistry, infected tissue sections with attached cysts were processed for haematoxylene and eosin staining. Cysts were aseptically fed to 4 day old leghorn chicken to obtain adult worms. Mechanically excysted metacercaria and the ovigerous adult worms were stained in carmine to prepare permanent slides. Results: One year survey for the infection of encysted progenetic metacercaria of C. complanatum in C. punctatus revealed the prevalence, intensity and abundance of 24.7%, 2.27 and 0.608, respectively. Histopathology showed heavy infiltration of immune cells at the site of cyst attachment and some tissue damage was also evident. Following feeding to experimental chicken, about 41.07%of the encysted metacercariae were able to excyst and migrate back to bucco-pharyngeal region where they tenaciously attached and fed on blood, and transformed into ovigerous adult worms from 62 hours onwards of post infection. Conclusions:The parasite is potentially pathogenic to the host, and the availability of a suitable intermediate host can be a contributing factor for the occurrence of C. complanatum metacercaria either in the excysted or encysted form, indicating loose host specificity and zoonotic potential.

Preliminary observations on fluids incubated with Wuchereria bancrofti using the immunochromatographic test / Observações preliminares de fluidos incubados com Wuchereria bancrofti usando o teste imunocromatográfico

To assess the performance of the immunochromatographic test for filariasis, adult Wuchereria bancrofti worms were incubated under different conditions. The tests were strongly positive with incubation fluids from both living and mechanically damaged females. Negative results were observed with incubation fluids from all male worms and from intact dead females.

Para a valiar o desempenho do teste imunocromatográfico para filariose, vermes adultos de Wuchereria bancrofti foram incubados em diferentes condições. Os testes foram fortemente positivos com fluidos de incubação de fêmeas vivas e danificadas mecanicamente. Resultados negativos foram obtidos com fluidos de todos os machos e de fêmeas mortas intactas.

Preparation of a monoclonal antibody against Trichinella spiralis adult and its protective immunity / 中华传染病杂志

Objective To prepare a monoclonal antibody(McAb) against Trichinella spiralis (T.s) adult and study its protective immunity. Methods BALB/c mice were immunized with soluble antigens of 3 day adult of T.s. Immnuized spleen cells of BALB/c mice were fused with myeloma cells sp2/0. The hybridoma culture supernatant was isotyped by the Ouchterlony double diffusion technique and the specificity of the McAb was determined by immunoblotting. The protective immunity of the McAb was detected after challenging the mice by the intravenous way. Results A McAb against T.s adult was obtained. The titer of culture fluid and ascetic fluid was 1∶6 400 and 1∶204 800, respectively. This McAb was identified as IgM. Western blotting results showed this McAb can be used to identify 40 000 protein of adult worm, muscle larvae and newborn larvae of T.s. No cross reactions with antigens of Ascaris suum Goeze, Taenia solium Linnaeus, Echinococcus granulosus and Schistosoma were oberserved. The number of muscle larvae was decreased by 55.63% when giving McAb to mice intravenously. Conclusions A species specific McAb against T.s adult was established and its protective immunity was identified. This McAb can be used as a powerful tool in screening Trichinella vaccine candidates.

Construction of Phage Display cDNA Library from Adult Worms of Schistosoma japonicum / 中国寄生虫学与寄生虫病杂志

Objective To screen protective antigen genes and construct the T7 phage display library from adult worms of Schistosoma japonicum.Methods Total RNA was extracted from adult worms of S.japonicum by Trizol reagent and mRNA was isolated from the total RNA.The ds cDNA was synthesized by reverse transcription using random primer.Directional EcoRⅠ/HindⅢ linkers were ligated into the ends of ds cDNA and the ds cDNA was digested with EcoRⅠand HindⅢ,which resulted in ds cDNA with EcoRⅠand HindⅢ adhering ends.The digested ds cDNA fragments longer than 300 bp in length were fractionated and ligated into T7 Select 10-3b vector.After packaging in vitro,the T7 Select 10-3b vector was transformed into BLT5403 to construct the T7 phage display cDNA library.Plaque assay and PCR were used to evaluate the library.Seven known objective genes of S.japonicum were screened by PCR to detect the representation of the library.Result Primary library capacity was 4.98?106 pfu,and the titer of amplified library was 3.85?1011 pfu/mL.The PCR identification result of 96 clones picked at random showed that recombination rate was 93.8%,in which 95.6% inserted cDNA fragments were longer than 300 bp in length.All the seven known objective genes of S.japonicum were amplified from the library.Conclusion The T7 phage display library from adult worms of Schistosoma japonicum was constructed.

Immunoscreening and Sequence Analysis of a cDNA Library of Adult Trichinella spiralis / 中国寄生虫学与寄生虫病杂志

Objective To obtain an antigenic gene of adult Trichinella spiralis. Methods cDNA library of the adult Trichinella spiralis was screened using the sera of immunized and infected rabbits. The gene sequence was analyzed by DNAstar software and GenBank database. Results Nine positive clones were identified by immunoscreening. The clone Ts87 was sequenced and a cDNA with 1 172 bp full length was obtained using 5′ RACE technique, encoding 347 amino acids. Some possible antigen epitopes were predicted. Conclusion A novel antigenic gene of Trichinella spiralis was obtained.

Morphological observation on the reproductive system of adult Schistosoma japonicum under an optical microscope / 中国血吸虫病防治杂志

Objective To investigate the morphological features of reproductive system of adult Schistosoma japonicum under an optical microscope.Methods Adult schistosomes were obtained from infected mice with cercariae shedding from Oncomelania snails.The adult worms fixed with 10% formalin,dehydrated,imbedded in paraffin,cut at 3 ?m thick,stained by HE staining and then observed under an optical microscope.Results The reproductive organs of adult Schistosoma japonicum such as testicle,ovary,fallopian tube,vitellarium,yolk duct and hystera were displayed distinctly and typically.Conclusions The morphological features of reproductive system of adult Schistosoma japonicum are distinct and typical by using routine pathological techniques preparing and HE staining,which establishes a morphological foundation for the morphological teaching of schistosomes and reproductive biology research.

Analysis of early diagnostic fraction antigens of cercariae, adult worms and eggs of Schistosoma japonicum / 中国血吸虫病防治杂志

Objective To find out the valuable early diagnostic antigen of Schistosoma japonicum. Methods The sera of rabbits were collected at different time after the rabbits were infected with cercariae of Schitosoma japonicum. The fractions of the soluble cercaria antigen (SCA), soluble adult worm antigen (AWA) and soluble egg antigen (SEA) were separated by SDS-PAGE and recognized by Western blotting with rabbits' sera of different time of post-infection. Results In Western blotting, the bands of 94, 48, 41, 40 kDa and 38 kDa of SCA appeared the earliest and were recognized by the rabbits sera of 2-week post-infection, the bands of 71 kDa and 23 kDa of SCA reacted with the rabbits sera of 3-week post-infection strongly. The bands of 71 kDa and 58 kDa of AWA appeared the earliest and were recognized by rabbits sera of 3-week post-infection. The bands of SEA reacted earliestly to the rabbits sera of 4-week post-infection were 270, 151, 73, 69, 50 kDa and 24 kDa. Conclusion The fraction antigens of 94, 71, 48, 41, 40, 38 kDa and 23 kDa of SCA, the fraction antigens of 71 kDa and 58 kDa of AWA and the fraction antigens of 270, 151, 73, 69, 50 kDa and 24 kDa of SEA could be recognized by sera of acute infected rabbits and might have potential early immuno-diagnosis value for schistosomiasis.