Memorias do Instituto Oswaldo Cruz最新文献

{"title":"Impact of dengue virus infection on the cytoadherence of Plasmodium vivax-infected erythrocytes.","authors":"Maria Geuziane Soares da Cruz, Rafaella Oliveira Dos Santos, Maria Gloria Teixeira Sousa, Fabio Tm Costa, Marcus Vinícius Guimarães de Lacerda, Stefanie Costa Pinto Lopes, Pritesh Lalwani","doi":"10.1590/0074-02760240185","DOIUrl":"https://doi.org/10.1590/0074-02760240185","url":null,"abstract":"<p><strong>Background: </strong>Coinfections of Plasmodium parasites and the dengue virus have been linked to severe disease in some patients. The interactions between these two pathogens, particularly their effects on disease progression, highlight the clinical importance of understanding the mechanisms underlying the potential synergistic effects.</p><p><strong>Objectives: </strong>The primary objective of this study was to investigate the adhesion dynamics of Plasmodium vivax-infected erythrocytes (Pv-iRBCs) in the presence of dengue virus (DENV) infection. By examining the interaction between these pathogens, the study aimed to provide insights into how coinfections might influence disease severity and progression.</p><p><strong>Methods: </strong>HepG2 cells were infected with DENV to observe changes in adhesion receptors and Pv-iRBCs adhesion capacity. Experiments using trypsin-treated Pv-iRBCs and UV-inactivated DENV dissected the adhesion process. Small molecule inhibitors were used to assess innate activation. ICAM-1 expression and its functional significance was quantified using a monoclonal anti-ICAM-1 antibody.</p><p><strong>Findings: </strong>We noted a significant increase in cytoadherence of Pv-iRBCs following DENV infection compared to mock conditions. Both trypsin treatment of Pv-iRBCs and UV inactivation of DENV led to a reduction in cytoadherence, underscoring their impact on the adhesion process. Notably, DENV infection induces an innate immune activation upregulating ICAM-1 on the cell surface and blocking with a monoclonal anti-ICAM-1 antibody significantly reduced the cytoadherence of Pv-iRBCs.</p><p><strong>Main conclusions: </strong>Elevated ICAM-1 levels on DENV-permissive cells may not only trap parasites within several niches but also contribute to endothelial and haematological disturbances in individuals with coinfections. Further research is required to fully elucidate the roles of cytoadherence and immune activation in the pathogenesis of dengue and malaria coinfections.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240185"},"PeriodicalIF":2.5,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12039924/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144009057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute Chagas disease in Amazonia, western Pará: perspectives from medical assistance to genetic elucidation.","authors":"Helena Rangel Esper, Vera Lúcia Teixeira de Freitas, João Guilherme Pontes Lima Assy, Olívia Campos Pinheiro Berreta, Alisson Dos Santos Brandão, Erika Yoshie Shimoda Nakanishi, Claudia de Abreu Fonseca, Francisco Oscar de Siqueira França, Marta Heloísa Lopes","doi":"10.1590/0074-02760240108","DOIUrl":"https://doi.org/10.1590/0074-02760240108","url":null,"abstract":"<p><strong>Background: </strong>The experience of the USP Tropical Medicine Centre (NUMETROP) team in providing medical care during acute Chagas disease (ACD) outbreaks in Santarém, Pará, motivated this study.</p><p><strong>Objectives: </strong>To study the epidemiological, clinical-laboratory, and socio-cultural aspects of confirmed cases of ACD in outbreaks in Santarém from March 2016 to March 2018.</p><p><strong>Methods: </strong>Observational case series study of ACD outbreaks in two communities: Marimarituba in 2016 and Cachoeira do Aruã in 2017. Diagnostic characterisation included classification into discrete typing units (DTUs).</p><p><strong>Findings: </strong>Eight cases were diagnosed as ACD TcIV in Marimarituba and seven cases were identified as ACD TcI in Cachoeira do Aruã. Women of childbearing age were numerous in both groups, and one miscarriage and two possible vertical transmissions were observed. Fever and rash were the most common findings in Marimarituba, with a fatality rate of 12.5%. In both outbreaks, serological surveillance was performed three to 21 months after treatment, with no confirmation of a \"serological cure\".</p><p><strong>Main conclusions: </strong>We observed possible vertical transmission, diverse DTUs in the same municipality, and a lack of knowledge about patient outcomes. We highlight that, despite the importance of ACD in the Amazon region, there is no institutional follow-up of patients from diagnosis to cure.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240108"},"PeriodicalIF":2.5,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12039923/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Leukocyte telomere length and telomerase activity in Long COVID patients from Rio de Janeiro, Brazil.","authors":"Giane Gonçalves Dos Reis, Rafaele Tavares Silvestre, Gilda Alves, Lucas Delmonico, Mariana Chantre-Justino, Aline Dos Santos Moreira, Beatriz de Lima Alessio Müller, Carolina Ramos do Nascimento, Denzel Luis Pereira da Silva, Louisy Sanches Dos Santos, Ana Luíza de Mattos-Guaraldi, Maria Helena Ornellas","doi":"10.1590/0074-02760240129","DOIUrl":"https://doi.org/10.1590/0074-02760240129","url":null,"abstract":"<p><strong>Background: </strong>Coronavirus disease 2019 (COVID-19) is caused by the new coronavirus 2 (severe acute respiratory syndrome coronavirus 2 - SARS-CoV-2). Long COVID is a new condition associated with persistent COVID-19 symptoms and/or new emerging symptoms. Telomeres are specialised structures for genome protection at the end of chromosomes and telomerase is the enzyme that synthesises telomere DNA.</p><p><strong>Objectives: </strong>Patients with Long COVID symptoms were recruited at the Pedro Ernesto University Hospital (HUPE) in Rio de Janeiro, Brazil, with the main purpose of investigating the association between telomere length and Long COVID.</p><p><strong>Methods: </strong>Leukocyte telomere length (LTL) was determined by quantitative real-time polymerase chain reaction (qPCR) in 34 Long COVID patients compared to a control group (n = 122). Telomerase activity was determined by qPCR assays using the commercial kit from ScienCell. A questionnaire on symptoms, vaccine doses and blood count was completed.</p><p><strong>Findings: </strong>The Long COVID patients were found to have an increase in LTL. Telomerase activity was also examined in a smaller number of patients and found to be reactivated in the blood.</p><p><strong>Main conclusions: </strong>It will be necessary to conduct further studies and monitor Long COVID patients to determine if future health issues could be linked to telomerase activity and elongated telomeres.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240129"},"PeriodicalIF":2.5,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11984962/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143970492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pandemic ST131 Escherichia coli presenting the UPEC/EAEC and ExPEC/EAEC hybrid pathotypes recovered from extraintestinal infections in a clinical setting of the Brazilian Amazon region.","authors":"Nathália Ms Bighi, Érica Lourenço Fonseca, Fernanda S Freitas, Sergio Mascarenhas Morgado, Ana Carolina Paulo Vicente","doi":"10.1590/0074-02760240204","DOIUrl":"https://doi.org/10.1590/0074-02760240204","url":null,"abstract":"<p><strong>Background: </strong>Escherichia coli is a commensal organism but may become pathogenic by the acquisition of virulence factors involved with intestinal (IPEC) or extraintestinal (ExPEC) infections. Some strains, known as hybrids, may harbour virulence determinants of both IPEC and ExPEC pathotypes, increasing their virulence potential. Reports of hybrid E. coli in Brazil are rare, and the associated lineages were poorly explored.</p><p><strong>Objectives: </strong>This study characterised ExPEC E. coli strains focusing on the occurrence of hybrid pathotypes.</p><p><strong>Methods: </strong>Fifteen clinical ExPEC strains were submitted to multilocus sequence typing (MLST), susceptibility test, and polymerase chain reaction (PCR) targeting IEC/ExPEC virulence markers.</p><p><strong>Findings: </strong>All strains were multidrug-resistant, and 11 STs were determined among the 15 ExPEC strains, including local/new and pandemic lineages, such as ST69 and ST131. Twelve/15 isolates were classified as hybrids, due to the presence of virulence markers of both Enteroaggregative E. coli (EAEC) and ExPEC or UPEC pathotypes. These UPEC/EAEC (n = 10) and ExPEC/EAEC (n = 2) hybrid strains were found among distinct phylogroups and lineages, including new STs. Interestingly, most hybrids belonged to the pandemic ST131 lineage, and this genotype had never been previously reported in the ST131 circulating in Brazil.</p><p><strong>Main conclusions: </strong>Therefore, this study provides new information on the epidemiological scenario of hybrid E. coli, contributing to a better understanding of the occurrence and pathogenic potential of these organisms.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240204"},"PeriodicalIF":2.5,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11984961/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144031388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Agglomerative hierarchical cluster analysis and temporal trend of leprosy indicators in Brazilian states, 2012-2022.","authors":"Lúcia Rolim Santana de Freitas, Fernanda Fernandez Nóbrega","doi":"10.1590/0074-02760240163","DOIUrl":"https://doi.org/10.1590/0074-02760240163","url":null,"abstract":"<p><strong>Background: </strong>Leprosy, a neglected tropical disease caused by Mycobacterium leprae, presents significant public health challenges in Brazil due to its slow progression, dermato-neurological manifestations, and potential for disability. Understanding leprosy's spatial distribution and temporal trends is important for effective control and elimination strategies.</p><p><strong>Objectives: </strong>This study aimed to identify clusters of leprosy in Brazilian states using agglomerative hierarchical clustering and to analyse their temporal trends from 2012 to 2022.</p><p><strong>Methods: </strong>An ecological study was conducted using data from the National System of Notifiable Diseases (SINAN). The agglomerative hierarchical clustering method was used to group states using the new case detection rate (NCDR) of leprosy per 100,000 inhabitants, the proportion of new cases of leprosy with grade 2 physical disability at the time of diagnosis (G2R), and the Gini index, a measure of socioeconomic inequality. Temporal trends within the clusters were assessed using Prais-Winsten regression analysis.</p><p><strong>Findings: </strong>In the period 2012-2022, 293,030 new cases of leprosy were reported in Brazil. Five distinct clusters were identified. Cluster 4, comprising Mato Grosso and Tocantins, had the highest NCDR and stable temporal trends (APC: 3.2%, 95% CI: -0.1%, 6.7%). Clusters 1 and 3 had the highest proportions of grade 2 disability, indicating late diagnosis. Clusters 4 and 5 had the lowest percentages of individuals with incomplete/complete higher education (7.6% and 7.4%, respectively). Cluster 4 had the highest percentage of individuals with the Diforma clinical form (69.8%) and with cases classified as multibacillary (84.5%).</p><p><strong>Main conclusions: </strong>The use of agglomerative hierarchical clustering, a novel application of a non-supervised algorithm in this context, highlighting the integration of multiple epidemiological and socioeconomic variables for a better understanding the dynamics of leprosy transmission in Brazil. Significant variations in the spatial distribution and temporal trends of leprosy were observed across Brazilian states. To improve leprosy surveillance and control in Brazil, targeted interventions are needed, particularly in high-endemicity regions with late diagnosis.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240163"},"PeriodicalIF":2.5,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11984828/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144025380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prognostic value of soluble TNF receptors in Chagas cardiomyopathy: observational study.","authors":"Matheus Ribeiro Ávila, Daniel Menezes de Souza, Lucas Fróis Fernandes de Oliveira, Pedro Henrique Scheidt Figueiredo, Liliany Mara Carvalho Silva, Whesley Tanor Silva, Mauro Felippe Felix Mediano, Leonardo Augusto da Costa Teixeira, Luciano Fonseca Lemos de Oliveira, Marcus Alessandro de Alcantara, Sanny Cristina de Castro Faria, Arthur Nascimento Arrieiro, Vanessa Amaral Mendonça, Ana Cristina Rodrigues Lacerda, Henrique Silveira Costa","doi":"10.1590/0074-02760240107","DOIUrl":"10.1590/0074-02760240107","url":null,"abstract":"<p><strong>Background: </strong>Chronic Chagas cardiomyopathy (CCC) is the most severe clinical form of the Chagas disease. There is a strong correlation between soluble tumor necrosis factor receptors (sTNFR1 and sTNFR2) and cardiac and functional parameters in CCC, but their prognostic value remains unknown.</p><p><strong>Objective: </strong>To verify the prognostic value of sTNFR1 and sTNFR2 in CCC.</p><p><strong>Methods: </strong>A longitudinal study was conducted. Sixty-nine patients with CCC (53.70 ± 9.66 years, NYHA I-II) were submitted to blood collection and echocardiography, and followed for 43.81 ± 1.21 months. The outcome was determined by the combination of cardiac death, heart transplantation, or stroke.</p><p><strong>Findings: </strong>After the follow-up, 15 patients (22%) presented adverse cardiovascular events. Only left ventricular ejection fraction (LVEF) [heart rate at rest (HR): 0.935, 95% CI 0.878 to 0.994; p = 0.033] and sTNFR2 (HR: 1.002, 95% CI 1.001 to 1.003; p = 0.006) remained as independent predictors of adverse cardiovascular events. The optimal cutoff point to identify these patients was the value of 1784.00 pg/mL. There was a significant difference between the groups with lower and higher sTNFR2 levels (long-rank < 0.001).</p><p><strong>Main conclusions: </strong>High serum levels of sTNFR2, together with lower LVEF, are strong independent predictors of adverse cardiovascular events in CCC, making them valuable for risk stratification.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240107"},"PeriodicalIF":2.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11984556/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143803661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First record of natural infection by Angiostrongylus cantonensis (Nematoda: Metastrongyloidea) in Tanychlamys indica (Godwin-Austen, 1883) in the city of São Paulo, Brazil.","authors":"Dan Jessé Gonçalves da Mota, Sylvio Cesar Rocco, Liliane Ré Di Luca, Jailson Apóstolo Dos Santos, Eliana Fernandes Pavani Werneck, Amanda de Oliveira Baccin, Ricardo Gava, Vera Lucia Pereira-Chioccola, Leyva Cecília Vieira de Melo","doi":"10.1590/0074-02760240192","DOIUrl":"10.1590/0074-02760240192","url":null,"abstract":"<p><strong>Background: </strong>Tanychlamys indica (Godwin-Austen, 1883) was reported as a serious pest in India. The snails are voracious and feed on a wide range of commercial crops. It has also been identified as an intermediate nematode host of Angiostrongylus cantonensis in Bombay, India. T. indica was recently introduced in Brazil by international trade of citrus fruit seedlings. First in the State of Santa Catarina and then in Paraná. Recently, it has been detected in the city of São Paulo threatening to spread to other Brazilian states.</p><p><strong>Objectives: </strong>We report the first record, in Brazil, of the natural infection by L3 larvae of A. cantonensis isolated from T. indica collected in the Vila Leopoldina neighbourhood, located in the west zone of São Paulo city.</p><p><strong>Methods: </strong>In January 2023, a team from LABFAUNA and UVIS Lapa collected 36 molluscs identified as T. indica in Vila Leopoldina, São Paulo city. Of these, 20 molluscs were subjected to individual parasitological analysis at the Instituto Adolfo Lutz, using the modified Rugai methodology.</p><p><strong>Findings: </strong>A total of 145 larvae were identified morphologically and classified according to Ash's criteria. These larvae were identified as third - stage larvae (L3) of A. cantonensis by real time polymerase chain reaction (PCR).</p><p><strong>Main conclusions: </strong>It is evident that further research is imperative to map the distribution of T. indica in Brazil and to assess its potential as an intermediate host for the nematode A. cantonensis, as well as the economic risks to agriculture. Over the past two decades, human cases of neuroangiostrongyliasis have been documented in the Southeast, North, Northeast, and South regions of Brazil. Additionally, there are records of natural infection with A. cantonensis in molluscs and rodents.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240192"},"PeriodicalIF":2.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11964093/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143764355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heterochromatin protein 1 (HP1) of Schistosoma mansoni: non-canonical chromatin landscape and oviposition effects.","authors":"Natália Silva da Trindade, Marilia Bergamini Valentini, Anne Rognon, Tiago Manuel Fernandes Mendes, Matheus de Souza Gomes, Silmara Marques Allegretti, Christoph Grunau, Fernanda Janku Cabral","doi":"10.1590/0074-02760240075","DOIUrl":"10.1590/0074-02760240075","url":null,"abstract":"<p><strong>Background: </strong>Heterochromatin protein 1 (HP1) is widespread in several organisms playing a role in control of gene expression by heterochromatin formation and maintenance of silent chromatin. Schistosoma mansoni is a human parasite that is responsible for Schistosomiasis, a tropical neglected disease in the tropical and subtropical areas in the world, where the intermediate host Biomphalaria glabrata is present.</p><p><strong>Objectives: </strong>In this study we attempted to investigate if the SmHP1 is enriched in S. mansoni chromatin in cercariae larvae stage, compared with another larvae stage sporocysts and its importance for S. mansoni life cycle progression and parasite oviposition.</p><p><strong>Methods: </strong>We used ChIPmentation with commercial antibody ab109028 that passed in-house quality control. We also used RNA interference, mice infection and histology.</p><p><strong>Findings: </strong>Our data show that S. mansoni HP1 enrichment is non-canonical with a peak at the transcription end sites of protein coding genes. We did not find strong differences in SmHP1 chromatin landscapes between sporocysts and cercariae. Knock- down of SmHP1 in schistosomula and in vivo experiments in mice unexpectedly increased parasite oviposition.</p><p><strong>Main conclusions: </strong>Our results suggest that SmHP1 may influence chromatin structure in a non-canonical way in S. mansoni stages and may play a role in regulation of parasite oviposition.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240075"},"PeriodicalIF":2.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11961034/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143764432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mapping special areas of the Brazilian National Malaria Control Program in the Amazon region: a territorial-based approach to surveillance.","authors":"Hermano Gomes Albuquerque, Gerusa Belo Gibson Santos, Alexandre San Pedro Siqueira, Ronan Rocha Coelho, Jefferson Pereira Caldas Dos Santos, Heitor Levi Ferreira Praça, Paulo Cesar Peiter, Leandro Henrique Vouga Pereira, Joseli Oliveira-Ferreira, Martha Cecilia Suárez Mutis","doi":"10.1590/0074-02760240068","DOIUrl":"10.1590/0074-02760240068","url":null,"abstract":"<p><strong>Background: </strong>The malaria control strategy of the Brazilian Ministry of Health involves the classification of transmission contexts into special areas based on the distinct determinants of malaria in each location.</p><p><strong>Objective: </strong>To search, find, organise, and map data about special areas using Brazilian databases and show their distribution among the states of the Brazilian Amazon.</p><p><strong>Methods: </strong>A search related to the socioenvironmental determinants of malaria was conducted in Brazilian databases using the special areas of the Ministry of Health as a reference. Data were compiled by states in the Brazilian Amazon.</p><p><strong>Findings: </strong>Indigenous areas occupy a significant portion of the Amazon territory and exhibit high incidence rates of malaria. Rural settlements also cover large areas of the Amazon, and in some states, more than 10% of malaria cases are associated with this typology. Legal and illegal mining areas, despite occupying small portions of the Amazon territory, contribute to the malaria caseload. In contrast, urban areas cover smaller regions, with low incidence rates.</p><p><strong>Main conclusions: </strong>Despite the progress represented by the typological structure of special areas by the Ministry of Health's, our findings reveal limitations related to them because of their complexities and emphasise the need to further substratify these areas to devise control strategies more adapted to them.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240068"},"PeriodicalIF":2.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11964091/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143764487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aedes aegypti reproductive aspects: constant light significantly affects the embryonic development.","authors":"Luana Cristina Farnesi, Gabrielle da Silva Oliveira Alves, Luciana Ordunha Araripe, Rafaela Vieira Bruno","doi":"10.1590/0074-02760240233","DOIUrl":"10.1590/0074-02760240233","url":null,"abstract":"<p><strong>Background: </strong>The importance of the mosquito Aedes aegypti as a vector of arboviruses like dengue, Zika, and chikungunya justifies the interest in investigating this species' physiology and reproductive biology. For the maintenance and expansion of Ae. aegypti populations, copulation, oogenesis, female oviposition capacity, embryo development and larval hatching are crucial processes regulated by biological clocks. Many of these parameters have currently been investigated under environmental and laboratory conditions. However, there are specific gaps regarding the effect of light on these critical reproductive aspects. In this study, the influence of light on some aspects of Ae. aegypti biology was evaluated.</p><p><strong>Objectives: </strong>We investigated, in laboratory conditions, the effects of constant light on Ae. aegypti reproductive features: spermathecal content, embryo morphology, females' fecundity, and egg viability.</p><p><strong>Methods: </strong>Morphological and physiological assays were performed using Ae. aegypti females and eggs obtained from forced egg laying. The reproductive aspects were analysed under constant light (LL = light/light) and light/dark cycles (LD12:12 = 12 h of light and 12 h of dark).</p><p><strong>Findings and main conclusions: </strong>Our results proved the negative effect of constant light on egg production (decreasing the fecundity) and embryonic development (causing a drop in egg viability and perceptive damage in the embryos). The results presented here bring new information on the impacts that a source of constant light may have on the reproductive biology of Ae. aegypti.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"120 ","pages":"e240233"},"PeriodicalIF":2.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11964090/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143764348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}