Concanavalin A with the property enhances T-cell activation have been known. BALB/c mice infected with Angiostrongylus cantonensis administrated with different doses 2.5mg/kg, 5mg/kg, 10mg/kg and vehicle from 7th day to 10th day p.i. and administrated with a single dose 5mg/kg at different period started from 7th day to 10th day, 14th day to 17th day,21th day to 24th day p.i. Effects of concanavalin A on Angiostrongylus cantonensis infected mice was determined by counting the percentage of eosinophil in blood, measuring the worm length, protein density in cerebro-spinal fluid, ELISA, and histological observation. Concanavalin A injection promotes eosinophila in Angiostrongylus cantonensis infected mice, antibody response and inhibits larvae growth. Protein density in CSF decrease when 10mg/kg dose given and period given from14th day to 17th day,period given from 21th day to 24th day. And hemorrhage in brain tissue was reduced.

The IgE response increased in hosts infected with Angiostrongylus cantonensis. This study analyzes IgE responses appeared in different body fluids of mice infected with A. cantonensis. BALB/c, CBA, C57BL/6 and C57BL/10 strain of mice were used in the experiment. BALB/c mice exhibited the highest susceptibility to A. cantonensis, CBA mice showed intermediate susceptibility, while C57BL/6 and C57BL/10 mice showed the lowest susceptibility. Analyses of specific antibodies against L5 antigens, and ES antigens in mice showed antibodies appeared in sera and in cerebrospinal fluids(CSF), especially IgE antibodies, were related to the worm rejection happened in mouse brain. However, antibodies appeared in ascites had no influence. The level of IgE increased in brain of susceptible BALB/c mice is much lower than that increased in other strain. Our data suggested that IgE response elicited in brain might be much more important than that in serum. Western blot analyses showed that among antigens extracted from L5 both IgE and IgG responses were positive in CSF. IgE antibodies against a 105 kDa protein of L5 antigen in C57BL/10 mice appeared in third week after infection, while in BALB/c mice appeared in fifth week. IgG antibodies against 105 kDa protein appeared in the identical weeks. Our results indicated that 105 kDa protein was related to specific antibodies responses about protective function of mice infected with A. cantonensis. Further researches will be required to understand function and characterization of this protein.

Reproduction de : Thèse d'exercice : Médecine. Médecine générale : Nantes : 2008. / Bibliogr.

Düsseldorf, Universiẗat, Diss., 2004.

This study evaluates the efficiency of albendazole against different stages of Angiostrongylus cantonensis in Sprague-Dawley rats. Using a single oral dose of albendazole of 10 mg/kg at 0 or 1 or 2 or 3 weeks post-infection (PI) showed that the drug in 0 or 1 weeks PI was more effective in the larval infection. Compared to those in non-treated control, the rats treated 0 or 1 weeks PI showed significant reductions not only in the relative wet weight of heart and lungs (g/100 g body weight), but also in the mean number of adults recovered. With regard to single oral doses of 10 or 50 or 100 mg/kg at weekly intervals from 6 weeks PI, the rats treated 100 mg/kg in 2 weeks post-treatment (PT) showed significant reduction in the L1 in its feces and the amounts were lastingly few. In the rats treated 10 or 50 mg/kg, larval output reappeared from 4 weeks PT. The histomorphology of granuloma formation was also investigated in the lungs of SD rats infected with A. cantonensis¡@by paraffin section. It was observed that granulomatous fibros was strongly associated with the number of L1 in the lungs. IgG and IgE antibodies specific for antigens from L1, L5, male worms or female adults of A. cantonensis were respectively measured by an enzyme-linked immunosorbent assay (ELISA). The specific IgE response to antigens from L1 or female adults of A. cantonensis in the serum reached the maximum at 1 and 5 weeks PI. Similarly, the eosinophil response also revealed remarkable peaks at 1 and 5 weeks PI. These results might prove that the increases of IgE titer and eosinophil are related to antibody-dependent cell mediated cytotoxicity (ADCC).

Made available in DSpace on 2016-03-08T14:05:17Z (GMT). No. of bitstreams: 2 juberlan_garcia_ioc_dout_2014.pdf: 5272747 bytes, checksum: 0a5731978e1e998b6728ba6318bbdb14 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2016-02-23 / A meningite eosinofílica é uma doença caracterizada pelo aumento de eosinófilos no líquido cefalorraquidiano (LCR), cuja causa mais comum é a invasão do sistema nervoso central por helmintos. Entre os helmintos, destaca-se o Angiostrongylus cantonensis. O roedor Rattus norvegicus é o hospedeiro natural definitivo e o homem atua como hospedeiro acidental e que pode se infectar através da ingestão de moluscos crus ou mal cozidos ou alimentos contaminados com a larva L3. Recentemente, no Brasil houve quatro casos de meningite eosinofílica, devido à ingestão ou manipulação de Achatina fulica infectada. Foi realizado uma avaliação das alterações metabólicas, fisiológicas e histopatológicas em R. norvegicus experimentalmente infectados com 100 larvas L3 de A. cantonensis e o estudo do efeito da infecção concomitante por Echinostoma paraensei e A. cantonensis sobre a atividade das aminotransferases ALT e AST, na concentração de proteínas totais, ácido úrico, ureia e análise histopatológica para compreender o efeito da infecção concomitante em Biomphalaria glabrata Os resultados obtidos demonstraram que a infecção causada por A. cantonensis em R. norvegicus promoveu alterações metabólicas hepáticas e histopatológicas, caracterizadas pelo aumento da atividade das enzimas ALT, AST, GGT e ALKP, alteração no metabolismo glicídico, presença de infiltrado inflamatório, alterações hematológicas significativas, além disso promoveu alterações histopatológicas no parênquima pulmonar demonstraram nos roedores a ocorrência de áreas de necrose e extensa fibrose, podendo estar diretamente relacionada com o desenvolvimento de hipóxia celular. Os moluscos infectados apresentaram alterações nos níveis das aminotransferases e aumento na excreção de produtos nitrogenados, os resultados histopatológicos mostraram uma mudança na distribuição de A. cantonensis na presença de E. paraensei, indicando que a presença deste trematódeo pode interferir na dinâmica do A. cantonensis. A infecção por A. cantonensis causou alterações metabólicas e histopatológicas nos roedores / E osinophilic meningitis is a disease characterized by increased eosinophils in the cerebrospinal fluid (CSF), which is the most common ly cause d by invasion of the central nervous system by helminths , as occurs in Angiostrongylus cantonensis infections . The rodent Rattus norvegicus is the definitive natural host and humans act as accidental host s and can become infected by eating raw or undercooked snail s or food contaminated with infective L 3 larvae. Recently in Brazil there have been four cases of eosinophilic meningitis due to ingestion of infected Achatina fulica . An evaluation of metabolic, p hysiological and pathological changes in R. norvegicus experimentally infected with 100 L 3 larvae of A. cantonensis and study the effect of co - infection with Echinostoma paraensei and A. cantonensis on the activity of aminotransferases ALT and AST was perf ormed in the concentration total protein, uric acid, urea and histopathologic analysis to understand the effect of co - infection in Biomphalaria glabrata . The results showed that the infection caused by A. cantonensis in R. norvegicus promoted histopathological changes in liver metabolism is characterized by increased activity of ALT, AST, GGT and ALKP enzymes in glucose metabolism, inflammatory infiltrate, hematological changes significant in addition in addition histopathological alt erations in lung parenchyma in rodents have shown the occurrence of extensive areas of necrosis and fibrosis, which can be directly related to the development of cellular hypoxia. The infected snails showed altered levels of aminotransferases and increased excretion of nitrogen products, histopathological findings showed a change in the distribution of A. cantonensis in the presence of E. paraensei, indicating that the presence of this trematode may interfere with the dynamics of A. cantonensis .

Abstract In order to determine whether antigens prepared from adult intestine of Angiostrongylus cantonensis have potential to induce a protective immunity in the rodent hosts, somatic antigens extracted from male and female adults as well as gut antigens isolated from female adults were used to immunize rats against A. cantonensis infection. A 14% reduction in L5 recorvery from brain as well as a 15% reduction in adult recovery from pulmonary artery were achieved in the immunized rats when compared with the control group after infection with 50 larvae. The length of worms recovered from immunized rats was shorter than that in other groups. The larvae recovered from fecal materials in immunized rats were also reduced. In cell proliferation test, the stimulation index of gut antigens increased with times of immunization and exhibited the highest values. However, serum IgG titers were not correlated with protective immune responses. A 84 kDa protein contained in all antigen preparations was recognized by immune serum against gut antigens. Strong positive reactions were detected by indirect immunofluorescent assay in the internal musculature of the body, gut and reproductive tract wall and gut lumen. The composition of gut antigens was similar to that of gut membrane proteins. Immune sera recognized several major gut proteins were also appeared on gut membrane proteins. Further studies are required to provide evidence that gut membrane proteins play in the protective immune response against A. cantonensis infections, including the 84 kDa protein.

Made available in DSpace on 2016-02-26T13:38:42Z (GMT). No. of bitstreams: 2 taina_monte_ioc_mest_2014.pdf: 2518433 bytes, checksum: 7691ab89b672f7a5b9084cbb9979957c (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2016-02-23 / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil / Angiostrongylus cantonensis é responsável por causar meningoencefalite eosinofílica em humanos e casos já foram registrados em diversas partes do mundo incluindo o Brasil (ES, PE e SP). Nesse estudo, relatamos a variabilidade genética entre isolados de A. cantonensis do Brasil utilizando sequências do gene mitocondrial COI. Foram identificados três haplótipos brasileiros de A. cantonensis, baseados em oito haplótipos conhecidos (ac1-ac8). O haplótipo brasileiro ac5 ficou agrupado com isolados do Japão e o haplótipo brasileiro ac8 (isolados do RJ, SP, PA e PE) formaram um clado distinto. Foi relatado um novo haplótipo brasileiro, haplótipo ac9, o qual se encontra intimamente relacionado com os haplótipos da China (ac6) e do Japão (ac7). Dois isolados brasileiros de A. cantonensis, Olinda e Caju (haplótipos ac8 e ac9, respectivamente) relatados no presente estudo, tiveram sua biologia e morfologia caracterizadas após infecção experimental. Foi observada diferença significativa com maior carga parasitária recuperada nos isolados de Caju e um número significativamente maior de larvas L1 eliminadas nas fezes no início do período patente. Entretanto, quando comparado o total de larvas eliminadas não foi verificada diferença significativa entre os dois isolados O isolado de Caju apresentou diferença significativa na proporção entre espécimes fêmeas e machos (0,64:1), enquanto que o mesmo não foi observado para o isolado de Olinda (1,16:1). A análise morfométrica revelou que os espécimes machos e fêmeas do isolado de Olinda foram significativamente maiores com relação aos caracteres analisados quando comparados com os espécimes de Caju. A análise morfológica evidenciou pequena variação no nível das bifurcações que unem os raios laterais no lobo direito da bolsa copuladora, entre os dois isolados. A variação genética observada apoia a hipótese que o aparecimento do parasito no Brasil é um resultado de múltiplas introduções de ratos parasitados e pelo molusco Achatina fulica, o qual contribui para a dispersão. As variações biológicas, morfológicas e morfométricas entre os dois haplótipos estudados, reforçam a variação observada pelo marcador COI e pela possível influência do isolamento geográfico. Estudos futuros devem ser realizados para verificar a possível presença do haplótipo recentemente relatado, ac9, em outras áreas do país, além da zona portuária da cidade do Rio de Janeiro / Angiostrongylus cantonensis is respons ible for causing eosinophili c meningoencephalitis in humans and cases have been recorded in various part s of the world including Brazil (ES, PE and SP) . In this study, we report the geneti c variability among Brazilian isolates of A. cantonensis using seque nces of the mitochondrial COI gen e . We identified three Brazilian haplotypes of A. cantonensis , based o n eight known haplotypes (ac1 - ac8) . The Brazilian haplotype ac 5 , was clustered with isolates from Japan and the Brazilian haplotype ac8 ( is olates from R J, SP, PA and PE) formed a distinct clade . It was reported a new Brazilian haplotype , haplotype ac9 , which is closely re lated to haplotype from China (ac6) and Japan (ac7) . Two Brazilian isolates of A. cantonensis , Olinda and Caju (haplotypes ac8 and ac9 , respectively ) reported in this st udy, had their biology and morphology characterized after experimental infection . Significant differences were observed with higher parasite load recovered in the isolates from Caju and a significantly greater number of L1 larvae eliminated in the feces at the beg inning of the patent pe riod . However , when compared to the total larvae eliminated there was no significant difference between the two isolates . The isolates from Caju showed significant difference in the proportion of female and male spec imens (0,64 :1) , but it was not observe d for isolates from Olinda (1,16 :1 ) . The m orphom etric analysis showed that male and female spec imens from Olinda were significantly higher with respect to the analyzed characters when c ompared w it h specimens from Caju. The m orphologic al analysis showed little variation in the level of bifurcations that unite the lateral rays in the right lobe of copulatory bursa , betwe en the two isolates . Genetic variation among isolates supports the hypothesis t hat the appearance of the parasite in Brazil is a result of multiple introd uctions of infected rodents and by the mollusc , Achatina fulica , which contributes to the dispersion . Biological, morphological and morphometric variation between the two haplotype s of A. cantonensis studied , reinforce the observed v ariation by the COI marker and the possible influence of geographical isolation. Future studies should be performed to verify the possible presence of the haplotype recently reported, ac 9, in other areas of the country, beyond the port area of the city of Rio de Janeiro.

Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-06-30T17:21:25Z No. of bitstreams: 1 TES_BIANCA_BARBIERI_COGNATO_COMPLETO.pdf: 2150300 bytes, checksum: 6c0ebf29cb36a3ae7a825cf9c0060dc4 (MD5) / Made available in DSpace on 2017-06-30T17:21:25Z (GMT). No. of bitstreams: 1 TES_BIANCA_BARBIERI_COGNATO_COMPLETO.pdf: 2150300 bytes, checksum: 6c0ebf29cb36a3ae7a825cf9c0060dc4 (MD5) Previous issue date: 2017-03-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Two nematode species belonging to the Metastrongyloidea superfamily are capable to produce disease in humans: Angiostrongylus cantonensis and Angiostrongylus costaricensis. Both are rodent parasites and human infection is considered accidental. Eosinophilic meningoencephalitis, caused by A. cantonensis, raises concern due to the expanding number of cases and geographical area of occurrence. Molecular and immunological methods for the diagnosis are crucial, however, after many studies with different antigenic molecules, has a specific and sensitive test to discriminate the angiostrongyliasis to others parasitoses is lacking. Cross-reactivity with other helminthes, which may cause similar symptoms, and eosinophilic meningitis, has been a problem for the satisfactory performance of specificity in serological tests. In order to improve the diagnosis of angiostrongyliasis, a comparative analysis of protein recognition from different extracts from A. cantonensis, Toxocara canis, Schistosoma mansoni and Strongyloides stercoralis against positive serum for Angiostrongylus.spp was performed. Through extraction kit, one-dimensional and two-dimensional electrophoresis, western blot and mass spectrometry, 149 proteins were identified. Among these, 34 were exclusive to A. cantonensis, COI being present only in the A. cantonensis extract, having no similarities with any other parasite compared in NCBI (nr database) and WormBase Database. Additionally, nine proteins were recognized by more than one parasite and extract, being important cross reactivity markers in parasitic infections. With the data obtained in this study, we suggest the use of the follow proteins as cross-reactivity markers: Galectin 1, HSPA-5 and Ifa1. In addition, immunogenic proteins of A. cantonensis ES-7, Lec-5 and 14-3-3, were recombinant expressed in two cell types, CHO and HEK. Their potential diagnostic values were verified by uni and bidimensional electrophoresis, western and dot blot, and N-glycosidase F (PNGase F) treatment using serum from patients infected with A. cantonensis, negative serum for parasites, and positive for other parasites. ES7 protein expressed in HEK and CHO cells and Lec-5 expressed in CHO were recognized only by Angiostrongylus-positive serum and not by negative control and specificity control in 2D and 1D tests, respectively. In the 2D analyzes Lec-5 showed a weak recognition with negative serum. However, the 14-3-3 protein didn?t show any specificity against A. cantonensis serum, since it was recognized by all tested sera. Antigen-antibody recognition was found to be dependent on the glycogenic portions, since when treated with N-glycosidase F (PNGase F), recognition between proteins and serum disappeared. The heterologous expression, using mammalian cells, as well as the identification of shared and/or specific molecules, may represent a promising source of antigens for the diagnosis of eosinophilic meningoencephalitis, and molecular diagnostic tests become necessary. / Duas esp?cies de nemat?deos pertencentes a superfam?lia Metastrongyloidea, s?o capazes de produzir doen?a em humanos: Angiostrongylus cantonensis e Angiostrongylus costaricensis. Ambos s?o parasitas pr?prios de roedores e a infec??o humana ? considerada acidental. A meningite eosinof?lica, causada por A. cantonensis, tem gerado preocupa??o na comunidade cient?fica pela expans?o da ?rea geogr?fica de ocorr?ncia. M?todos moleculares e imunol?gicos para o diagn?stico desta infec??o s?o cruciais para o diagn?stico, entretanto, ap?s muitos estudos com diferentes mol?culas antig?nicas, at? hoje n?o foi desenvolvido um teste de diagn?stico que seja espec?fico e sens?vel o suficiente para discriminar as angiostrongil?ases de outras parasitoses. A reatividade cruzada tem sido o principal problema encontrado nos estudos j? desenvolvidos para este prop?sito. Com o objetivo de aprimorar o diagn?stico das angiostrongil?ases, foi realizado neste estudo an?lise comparativa do reconhecimento de prote?nas de diferentes extratos teciduais de A. cantonensis, Toxocara canis, Schistosoma mansoni e Strongyloides stercoralis contra soro positivo para Angiostrongylus spp Atrav?s de kit de extra??o, eletroforese unidimensional e bidimensional, western blot e espectrometria de massas foram identificadas 149 prote?nas. Dentre estas, 34 foram exclusivas para A. cantonensis, sendo que COI estava presente apenas no extrato de A. cantonensis n?o possuindo similaridades com nenhum outro parasito comparado no NCBI (nr database) e WormBase Database. Estas prote?nas podem ser consideradas promissoras como marcadores de reatividade humoral espec?fica para o parasito. Todavia, outras nove prote?nas foram reconhecidas por mais de um parasito em mais de um extrato testado, sendo importantes marcadores de reatividade cruzada em infec??es parasit?rias. Com os dados obtidos neste estudo, sugerimos como marcadores de reatividade cruzada o uso das prote?nas: Galectin 1, HSPA-5 e Ifa1. Al?m disso, prote?nas imunog?nicas de A. cantonensis ES-7, Lec-5 e 14-3-3, foram expressas de forma recombinante em dois tipos celulares, CHO e HEK, e o potencial uso diagn?stico destas prote?nas foi verificado atrav?s de eletroforese uni e bidimensional, western e dot blot, e tratamento por N-glycosidase F (PNGase F), utilizando soro positivo para Angiostrongylus spp., soro negativo e positivo para outras parasitoses. Prote?na ES-7 expressa em c?lulas HEK e CHO, e Lec-5 expressa em CHO foram reconhecidas apenas pelo soro positivo para Angiostrongylus spp. e n?o pelo soro negativo e controles de especificidade em testes 2D e 1D, respectivamente. J? nas an?lises em 2D, Lec-5 apresentou fraco reconhecimento com soro negativo. J? a prote?na 14-3-3 n?o apresentou nenhuma especificidade pelo soro de A. cantonensis, j? que foi reconhecida por todos os soros testados. O reconhecimento ant?geno-anticorpo se mostrou dependente das por??es glic?dicas, j? que quando tratadas com N-glycosidase F (PNGase F), o reconhecimento das prote?nas pelo soro desapareceu. A express?o heter?loga, utilizando c?lulas de mam?feros, assim como a identifica??o de mol?culas compartilhadas e/ou espec?ficas, podem representar uma promissora fonte de ant?genos para o diagn?stico da meningite eosinof?lica, requerendo aprimorados testes moleculares para seu diagn?stico.

Made available in DSpace on 2015-03-26T13:47:24Z (GMT). No. of bitstreams: 1 texto completo.pdf: 812202 bytes, checksum: b8af5169f54eccc705c53128fef2ba2b (MD5) Previous issue date: 2014-02-19 / The parasitosis, in a medical and social standpoint, presents important public health problems. In Brazil, an average of a third of population lives in areas with risk of transmission and occurrence of parasitic diseases. The lack of basic sanitation, as well as environmental factors particular of tropical climates, inequality of the socioeconomic conditions of the individuals and the lack of information are factors that favor its occurrence. The colonization process, establishment of new routes of trade and human migration, contributed to the introduction of pathogens transported by their hosts to other regions. This way, various species found out of their origin area. The parasite Angiostrongylus cantonensis and the exotic snail Achatina fulica are two examples of organisms that were introduced in Brazil. A.fulica is one of the intermediate hosts of the parasite A. cantonensis, responsible for cause in humans, disease known as eosinophilic meningoencephalitis, may lead parasitized individuals to death. In various regions of the country, was confirmed the presence of this parasite naturally occurring, as well as cases of infected humans. This way, measures of alternative control, are important to avoid its dispersion. In this context was evaluated the predatory capability of eight fungal isolates belong to the species Duddingtonia flagrans (isolated: AC001, CG768 and CG722), Monacrosporium thaumasium (isolated: NF34), M. sinense (isolated: SF53) and Arthobotrys robusta (isolated: I31), A. cladodes (isolated: CG719) and A. conoídes (isolated: I40) on first larvae stage (L1) of A. cantonensis in laboratory conditions. Were formed nine groups: eight groups treated with the different isolated and one control group (without fungi). The groups treated contained 1000 conidia of isolated fungal and 1000 L1 of A. cantonensis in Petri dish containing Agar- water 2% (AA2%). The control group contained only 1000 L1 of A. cantonensis in AA2%. Evidence of predatory activity of all fungal isolates tested could be observed at the end of seven days of the experiment through the recovery of ixnon-predated L1, where were observed the following percentage of reduction of L1 with the respective isolates: AC001 (82,8%); CG768 (71,0%); CG722 (72,8%); NF34 (86,7%), SF53 (89,7%); I40 (48,3%), CG719 (84,7%) and I31 (80,4%). No difference was observed (p>0,01) between the action of the isolated used in the end of seven days, however, was observed difference (p<0,01) compared with the control group. The results observed demonstrated that the fungi belonged to the genus Duddingtonia (AC001, CG768 and CG722), Monacrosporium (NF34 and SF53) and Arthrobotrys (I31 and CG719), could be used in biological control, once that these were capable of reduce the population of larvae (L1) of A. cantonensis in vitro. / As parasitoses, do ponto de vista médico e social, representam importantes problemas de saúde pública. No Brasil, em média um terço da população vive em áreas com risco de transmissão e ocorrência de doenças parasitárias. A falta de saneamento básico, bem como fatores ambientais próprios de clima tropical, desigualdade das condições socioeconômicas dos indivíduos e a falta de informação favorecem sua ocorrência. Os processos de colonização, estabelecimento de novas rotas de comércio e migração humana, contribuíram para a introdução de patógenos transportados por seus hospedeiros para outras regiões. Dessa forma, várias espécies se encontram fora de sua área de origem. O parasito Angiostrongylus cantonensis e o caramujo exótico Achatina fulica, são dois exemplos de organismos que foram introduzidos no Brasil. A. fulica é um dos hospedeiros intermediários do parasito A. cantonensis, responsável por causar em humanos, doença conhecida como meningoencefalite eosinofilica, podendo levar indivíduos parasitados a óbito. Em várias regiões do país, foi confirmada a presença deste parasito ocorrendo naturalmente, bem como casos de humanos infectados. Dessa forma, medidas de controle alternativo, são importantes para evitar sua dispersão. Nesse contexto foi avaliada a capacidade predatória de oito isolados fúngicos pertencentes ás espécies Duddingtonia flagrans (isolados: AC001, CG768 e CG722), Monacrosporium thaumasium (isolado: NF34), M. sinense (isolado: SF53) e Arthobotrys robusta (isolado: I31), A. cladodes (isolado: CG719) e A. conoídes (isolado: I40) sobre larvas de primeiro estádio (L1) de A. cantonensis em condições laboratoriais. Foram formados nove grupos: oito grupos tratados com os diferentes isolados, e um grupo controle (sem fungos). Os grupos tratados continham 1000 conídios dos isolados fúngicos e 1000 L1 de A. cantonensis em placa de Petri contendo o meio Agar-água 2% (AA2%). O viigrupo controle continha apenas 1000 L1 de A. cantonensis em AA2%. Evidências da atividade predatória de todos os isolados fúngicos testados, foram observadas ao final de sete dias do experimento, através da recuperação das larvas (L1) não predadas, sendo observados os seguintes percentuais de redução com os respectivos isolados: AC001 (82,8%); CG768 (71,0%); CG722 (72,8%); NF34 (86,7%), SF53 (89,7%); I40 (48,3%), CG719 (84,7%) e I31 (80,4%). Não houve diferença (p>0,01) entre a ação dos isolados utilizados ao final de sete dias, no entanto, foi observado diferença (p<0,01) em relação ao grupo controle. Os resultados demonstraram que os fungos pertencentes aos gêneros Duddingtonia (AC001, CG768 E CG722), Monacrosporium (NF34 e SF53) e Arthrobotrys (I31 e CG719), poderiam ser utilizados no controle biológico, uma vez que estes foram capazes de reduzir a população de larvas (L1) de A. cantonensis in vitro.