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  1. Article ; Online: Challenges of acute febrile illness diagnosis in a national infectious diseases center in Rio de Janeiro

    Clarisse da Silveira Bressan / Maria de Lourdes Benamor Teixeira / Maria Isabel Fragoso da Silveira Gouvêa / Anielle de Pina-Costa / Heloísa Ferreira Pinto Santos / Guilherme Amaral Calvet / Otilia Lupi / Andre Machado Siqueira / Rogério Valls-de-Souza / Clarissa Valim / Patrícia Brasil

    PLoS Neglected Tropical Diseases, Vol 17, Iss 4, p e

    16-year experience of syndromic surveillance.

    2023  Volume 0011232

    Abstract: Introduction Acute febrile illnesses (AFI) are a frequent chief complaint in outpatients. Because the capacity to investigate the causative pathogen of AFIs is limited in low- and middle-income countries, patient management may be suboptimal. ... ...

    Abstract Introduction Acute febrile illnesses (AFI) are a frequent chief complaint in outpatients. Because the capacity to investigate the causative pathogen of AFIs is limited in low- and middle-income countries, patient management may be suboptimal. Understanding the distribution of causes of AFI can improve patient outcomes. This study aims to describe the most common etiologies diagnosed over a 16-years period in a national reference center for tropical diseases in a large urban center in Rio de Janeiro, Brazil. Methods From August 2004-December 2019, 3591 patients > 12 years old, with AFI and/or rash were eligible. Complementary exams for etiological investigation were requested using syndromic classification as a decision guide. Results. Among the 3591 patients included, endemic arboviruses such as chikungunya (21%), dengue (15%) and zika (6%) were the most common laboratory-confirmed diagnosis, together with travel-related malaria (11%). Clinical presumptive diagnosis lacked sensitivity for emerging diseases such as zika (31%). Rickettsia disease and leptospirosis were rarely investigated and an infrequent finding when based purely on clinical features. Respiratory symptoms increased the odds for the diagnostic remaining inconclusive. Conclusions Numerous patients did not have a conclusive etiologic diagnosis. Since syndromic classification used for standardization of etiological investigation and presumptive clinical diagnosis had moderate accuracy, it is necessary to incorporate new diagnostic technologies to improve diagnostic accuracy and surveillance capacity.
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Subject code 610
    Language English
    Publishing date 2023-04-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Malaria time series in the extra-Amazon region of Brazil

    Klauss Kleydmann Sabino Garcia / Amanda Amaral Abrahão / Ana Flávia de Morais Oliveira / Karina Medeiros de Deus Henriques / Anielle de Pina-Costa / André Machado Siqueira / Walter Massa Ramalho

    Malaria Journal, Vol 21, Iss 1, Pp 1-

    epidemiological scenario and a two-year prediction model

    2022  Volume 11

    Abstract: Abstract Background In Brazil, malaria is caused mainly by the Plasmodium vivax and Plasmodium falciparum species. Its transmission occurs in endemic and non-endemic areas. Malaria geography in Brazil has retracted and is now concentrated in the North ... ...

    Abstract Abstract Background In Brazil, malaria is caused mainly by the Plasmodium vivax and Plasmodium falciparum species. Its transmission occurs in endemic and non-endemic areas. Malaria geography in Brazil has retracted and is now concentrated in the North region. The Brazilian Amazon region accounts for 99% of Brazil's cases. Brazil’s extra-Amazon region has a high frequency of imported cases and in 2019 presented a mortality rate 123 times higher than the Amazon region. Extra-Amazon cases present risks of reintroduction. This study aims to characterize the epidemiological scenario for malaria in the extra-Amazon region of Brazil from 2011 to 2020 with a two-year forecast. Methods Time-series study with description of malaria cases and deaths registered in Brazilian extra-Amazon region from 2011 to 2020. Public data from the Notifiable Diseases Information System (Sinan) and the Mortality Information System (SIM) were used. Descriptive analysis, incidence, and notification rates were calculated. Flow charts analysed the flux between Places of Probable Infection (PI) and places of notification. The prediction model utilized a multiplicative Holt-winters model for trend and seasonality components. Results A total of 6849 cases were registered. Cases were predominantly white males with 9 to 11 years of education, mostly between 30 and 39 years old. Imported cases accounted for 78.9% of cases. Most frequent occupations for imported cases are related to travelling and tourism activities. Among autochthonous cases, there is a higher frequency of agriculture and domestic economic activities. In the period there were 118 deaths due to malaria, of which 34.7% were caused by P. falciparum infections and 48.3% were not specified. The most intense flows of imported cases are from Amazonas and Rondônia to São Paulo, Rio de Janeiro, and Paraná. The prediction estimates around 611 cases for each of the following two years. Conclusion The time series allows a vast epidemiological visualization with a short-term prediction analysis ...
    Keywords Malaria ; Malaria Case ; Epidemiology ; Public Health ; Control ; Elimination ; Extra-Amazon ; Arctic medicine. Tropical medicine ; RC955-962 ; Infectious and parasitic diseases ; RC109-216
    Subject code 910
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Driving forces for COVID-19 clinical trials using chloroquine

    Wuelton Marcelo Monteiro / Jose Diego Brito-Sousa / Djane Baía-da-Silva / Gisely Cardoso de Melo / André Machado Siqueira / Fernando Val / Cláudio Tadeu Daniel-Ribeiro / Marcus Vinicius Guimarães Lacerda

    Revista da Sociedade Brasileira de Medicina Tropical, Vol

    the need to choose the right research questions and outcomes

    2020  Volume 53

    Keywords Arctic medicine. Tropical medicine ; RC955-962
    Language English
    Publishing date 2020-04-01T00:00:00Z
    Publisher Sociedade Brasileira de Medicina Tropical (SBMT)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Evaluation of the effect of supervised anti-malarial treatment on recurrences of Plasmodium vivax malaria

    Kelry Mazurega Oliveira Dinelly / Sheila Vitor-Silva / Jose Diego Brito-Sousa / Vanderson Souza Sampaio / Milena Gabriela Oliveira Silva / André Machado Siqueira / Cássio Peterka / Sheila Rodovalho / Aretha Gomes Omena / Wuelton Marcelo Monteiro / Marcus Vinícius Guimarães Lacerda / Gisely Cardoso Melo

    Malaria Journal, Vol 20, Iss 1, Pp 1-

    2021  Volume 6

    Abstract: Abstract Background Relapses in vivax malaria have posed great challenges for malaria control, and they also account for a great proportion of reported cases. Knowing the real effectiveness of a 7-day primaquine (PQ) scheme is crucial in order to ... ...

    Abstract Abstract Background Relapses in vivax malaria have posed great challenges for malaria control, and they also account for a great proportion of reported cases. Knowing the real effectiveness of a 7-day primaquine (PQ) scheme is crucial in order to evaluate not only the cost-effectiveness of implementing new anti-hypnozoite drugs, but also how health education strategies can guarantee better compliance and be reinforced. This study aimed to evaluate the effect of daily treatment with chloroquine and PQ supervised by health workers versus prescription without supervision. Methods The outcome was the passive detection of new positive thick blood smears up to 180 days, based on the official data records from the National Malaria Control Programme. The recurrences seen in the real life were, therefore, used as a surrogate for true relapses. Results Patients under supervised treatment had a lower risk of recurrence up to day 180 when compared to the unsupervised treatment (17.9% vs. 36.1%; p = 0.027). Conclusions The lack of supervision in the non-supervised group (which followed standard of care in the real life) enabled proper comparison, as consent itself would have lead to greater compliance in this group. Future studies should scale such an analysis to different settings in the Brazilian Amazon.
    Keywords Malaria ; Plasmodium vivax ; Supervised treatment ; Unsupervised treatment ; Recurrence ; Arctic medicine. Tropical medicine ; RC955-962 ; Infectious and parasitic diseases ; RC109-216
    Subject code 616
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Classification of chikungunya cases

    Carlos Alexandre Antunes de Brito / André Ricardo Ribas Freitas / Rodrigo Fabiano Said / Melissa Barreto Falcão / Rivaldo Venâncio da Cunha / André Machado Siqueira / Maria Glória Teixeira / Guilherme Sousa Ribeiro / Marina Coelho Moraes de Brito / Luciano Pamplona de Góes Cavalcanti

    Revista da Sociedade Brasileira de Medicina Tropical, Vol

    a proposal

    2020  Volume 53

    Keywords Arctic medicine. Tropical medicine ; RC955-962
    Language English
    Publishing date 2020-11-01T00:00:00Z
    Publisher Sociedade Brasileira de Medicina Tropical (SBMT)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Should we care about Plasmodium vivax and HIV co-infection? A systematic review and a cases series from the Brazilian Amazon

    Paola López Del-Tejo / Nadia Cubas-Vega / Cecilia Caraballo-Guerra / Bernardo Maia da Silva / Jefferson da Silva Valente / Vanderson Souza Sampaio / Djane Clarys Baia-da-Silva / Daniel Barros Castro / Flor Ernestina Martinez-Espinosa / André Machado Siqueira / Marcus Vinícius Guimarães Lacerda / Wuelton Marcelo Monteiro / Fernando Val

    Malaria Journal, Vol 20, Iss 1, Pp 1-

    2021  Volume 11

    Abstract: Abstract Background Malaria and HIV are two important public health issues. However, evidence on HIV-Plasmodium vivax co-infection (HIV/PvCo) is scarce, with most of the available information related to Plasmodium falciparum on the African continent. It ... ...

    Abstract Abstract Background Malaria and HIV are two important public health issues. However, evidence on HIV-Plasmodium vivax co-infection (HIV/PvCo) is scarce, with most of the available information related to Plasmodium falciparum on the African continent. It is unclear whether HIV can change the clinical course of vivax malaria and increase the risk of complications. In this study, a systematic review of HIV/PvCo studies was performed, and recent cases from the Brazilian Amazon were included. Methods Medical records from a tertiary care centre in the Western Brazilian Amazon (2009–2018) were reviewed to identify HIV/PvCo hospitalized patients. Demographic, clinical and laboratory characteristics and outcomes are reported. Also, a systematic review of published studies on HIV/PvCo was conducted. Metadata, number of HIV/PvCo cases, demographic, clinical, and outcome data were extracted. Results A total of 1,048 vivax malaria patients were hospitalized in the 10-year period; 21 (2.0%) were HIV/PvCo cases, of which 9 (42.9%) had AIDS-defining illnesses. This was the first malaria episode in 11 (52.4%) patients. Seven (33.3%) patients were unaware of their HIV status and were diagnosed on hospitalization. Severe malaria was diagnosed in 5 (23.8%) patients. One patient died. The systematic review search provided 17 articles (12 cross-sectional or longitudinal studies and 5 case report studies). A higher prevalence of studies involved cases in African and Asian countries (35.3 and 29.4%, respectively), and the prevalence of reported co-infections ranged from 0.1 to 60%. Conclusion Reports of HIV/PvCo are scarce in the literature, with only a few studies describing clinical and laboratory outcomes. Systematic screening for both co-infections is not routinely performed, and therefore the real prevalence of HIV/PvCo is unknown. This study showed a low prevalence of HIV/PvCo despite the high prevalence of malaria and HIV locally. Even though relatively small, this is the largest case series to describe HIV/PvCo.
    Keywords Plasmodium vivax ; HIV ; Co-infection ; Systematic review ; Epidemiology ; Arctic medicine. Tropical medicine ; RC955-962 ; Infectious and parasitic diseases ; RC109-216
    Subject code 306
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Chikungunya Death Risk Factors in Brazil, in 2017

    Rhaquel de Morais Alves Barbosa Oliveira / Francisca Kalline de Almeida Barreto / Geovana Praça Pinto / Isabella Timbó Queiroz / Fernanda Montenegro de Carvalho Araújo / Kilma Wanderley Lopes / Regina Lúcia Sousa do Vale / Daniele Rocha Queiroz Lemos / John Washington Cavalcante / André Machado Siqueira / Lívia Carla Vinhal Frutuoso / Elisabeth Carmen Duarte / Antônio Silva Lima Neto / André Ricardo Ribas Freitas / Luciano Pamplona de Góes Cavalcanti

    PLoS ONE, Vol 17, Iss 4, p e

    A case-control study.

    2022  Volume 0260939

    Abstract: Background In 2016/2017 we had a major epidemic of chikungunya (CHIK) in Brazil, with many deaths. We evaluated to factors associated with deaths from CHIK that occurred in the city of Fortaleza, Brazil. Methods A matched case-control study was conducted ...

    Abstract Background In 2016/2017 we had a major epidemic of chikungunya (CHIK) in Brazil, with many deaths. We evaluated to factors associated with deaths from CHIK that occurred in the city of Fortaleza, Brazil. Methods A matched case-control study was conducted (1:2), by sex, age (± 5 years) and neighborhood. Cases were CHIK deaths that occurred between January 1 and December 31, 2017, in Fortaleza, Brazil, and which were laboratory confirmed. Controls were laboratory confirmed CHIK patients occurring in the same neighborhood and in the same period, but which did not progress to death. Results 82 cases of CHIK and 164 controls were included. Considering the clinical history, significant associations were found between other chronic heart diseases (OR 3.8; CI: 1.53-9.26) and chronic kidney disease (OR 12.77; CI: 2.75-59.4). In the multivariate analysis of the variables related to signs and symptoms, fever (OR: 19.23 CI: 1.73-213.78), abdominal pain (OR: 3; 74 CI: 1.06-13.16), apathy (OR: 11.62 CI: 2.95-45.82) and dyspnea (OR: 50.61; CI: 12.37-207.18) were identified with greater likelihood of death from CHIK. It also stood out that altered blood glucose was associated with cases with a worse prognosis (OR: 13.5; CI: 1.3-135.0). Among the laboratory findings, only lymphocytes and albumin were not associated with greater likelihood of death. Conclusion The factors related with deaths were chronic kidney disease and previous heart disease, presence of fever, abdominal pain, apathy, dyspnea and arthritis and laboratory findings such as leukocytosis, leukopenia, thrombocytopenia, neutropenia and lymphopenia.
    Keywords Medicine ; R ; Science ; Q
    Subject code 610
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: The association between nutritional status and malaria in children from a rural community in the Amazonian region

    Márcia Almeida Araújo Alexandre / Silvana Gomes Benzecry / Andre Machado Siqueira / Sheila Vitor-Silva / Gisely Cardoso Melo / Wuelton Marcelo Monteiro / Heitor Pons Leite / Marcus Vinícius Guimarães Lacerda / Maria das Graças Costa Alecrim

    PLoS Neglected Tropical Diseases, Vol 9, Iss 4, p e

    a longitudinal study.

    2015  Volume 0003743

    Abstract: BACKGROUND:The relationship between malaria and undernutrition is controversial and complex. Synergistic associations between malnutrition and malaria morbidity and mortality have been suggested, as well as undernutrition being protective against ... ...

    Abstract BACKGROUND:The relationship between malaria and undernutrition is controversial and complex. Synergistic associations between malnutrition and malaria morbidity and mortality have been suggested, as well as undernutrition being protective against infection, while other studies found no association. We sought to evaluate the relationship between the number of malaria episodes and nutritional statuses in a cohort of children below 15 years of age living in a rural community in the Brazilian Amazon. METHODOLOGY/PRINCIPAL FINDINGS:Following a baseline survey of clinical, malaria and nutritional assessment including anthropometry measurements and hemoglobin concentration, 202 children ranging from 1 month to 14 years of age were followed for one year through passive case detection for malaria episodes. After follow-up, all children were assessed again in order to detect changes in nutritional indicators associated with malaria infection. We also examined the risk of presenting malaria episodes during follow-up according to presence of stunting at baseline. Children who suffered malaria episodes during follow-up presented worse anthropometric parameters values during this period. The main change was a reduction of the linear growth velocity, associated with both the number of episodes and how close the last or only malaria episode and the second anthropometric assessment were. Changes were also observed for indices associated with chronic changes, such as weight-for-age and BMI-for-age, which conversely, were more frequently observed in children with the last or only episode occurring between 6 and 12 months preceding the second nutritional assessment survey. Children with inadequate height-for-age at baseline (Z-score < -2) presented lower risk of suffering malaria episodes during follow-up as assessed by both the log-rank test (p =0.057) and the multivariable Cox-proportional hazards regression (Hazard Ratio = 0.31, 95%CI [0.10; 0.99] p=0.049). CONCLUSIONS:Malaria was associated with impaired nutritional status ...
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Subject code 360
    Language English
    Publishing date 2015-04-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Chloroquine resistance is associated to multi-copy pvcrt-o gene in Plasmodium vivax malaria in the Brazilian Amazon

    Siuhelem Rocha Silva / Anne Cristine Gomes Almeida / George Allan Villarouco da Silva / Rajendranath Ramasawmy / Stefanie Costa Pinto Lopes / André Machado Siqueira / Gabriel Luíz Costa / Taís Nóbrega Sousa / José Luiz Fernandes Vieira / Marcus Vinícius Guimarães Lacerda / Wuelton Marcelo Monteiro / Gisely Cardoso de Melo

    Malaria Journal, Vol 17, Iss 1, Pp 1-

    2018  Volume 8

    Abstract: Abstract Background The resistance of Plasmodium vivax to chloroquine has become an obstacle to control strategies based on the use of anti-malarials. The current study investigated the association between P. vivax CQ-resistance in vivo with copy number ... ...

    Abstract Abstract Background The resistance of Plasmodium vivax to chloroquine has become an obstacle to control strategies based on the use of anti-malarials. The current study investigated the association between P. vivax CQ-resistance in vivo with copy number variation and mutations in the promoter region in pvcrt-o and pvmdr1 genes. Methods The study included patients with P. vivax that received supervised treatment with chloroquine and primaquine. Recurrences were actively recorded during this period. Results Among the 60 patients with P. vivax, 25 were CQ-resistant and 35 CQ-susceptible. A frequency of 7.1% of multi-copy pvcrt-o was observed in CQ-susceptible samples and 7.7% in CQ-resistant at D0 (P > 0.05) and 33.3% in CQ-resistant at DR (P < 0.05). For pvmdr1, 10.7% of the CQ-susceptible samples presented multiple copies compared to 11.1% in CQ-resistant at D0 and 0.0% in CQ-resistant at DR (P > 0.05). A deletion of 19 bp was found in 11/23 (47.6%) of the patients with CQ-susceptible P. vivax and 3/10 (23.1%) of the samples with in CQRPv at D0. At day DR, 55.5% of the samples with CQRPv had the 19 bp deletion. For the pvmdr-1 gene, was no variation in the analysed gene compared to the P. vivax reference Sal-1. Conclusions This was the first study with 42-day clinical follow-up to evaluate the variation of the number of copies and polymorphisms in the promoter region of the pvcrt-o and pvmdr1 genes in relation to treatment outcomes. Significantly higher frequency of multi-copy pvcrt-o was found in CQRPv samples at DR compared to CQ-susceptible, indicating parasite selection of this genotype after CQ treatment and its association with CQ-resistance in vivo.
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Infectious and parasitic diseases ; RC109-216
    Subject code 616
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Malaria in the State of Amazonas

    Vanderson Souza Sampaio / André Machado Siqueira / Maria das Graças Costa Alecrim / Maria Paula Gomes Mourão / Paola Barbosa Marchesini / Bernardino Cláudio Albuquerque / Joabi Nascimento / Élder Augusto Guimarães Figueira / Wilson Duarte Alecrim / Wuelton Marcelo Monteiro / Marcus Vinícius Guimarães Lacerda

    Revista da Sociedade Brasileira de Medicina Tropical, Vol 48, Iss suppl 1, Pp 4-

    a typical Brazilian tropical disease influenced by waves of economic development

    2015  Volume 11

    Abstract: In Brazil, more than 99% of malaria cases are reported in the Amazon, and the State of Amazonas accounts for 40% of this total. However, the accumulated experience and challenges in controlling malaria in this region in recent decades have not been ... ...

    Abstract In Brazil, more than 99% of malaria cases are reported in the Amazon, and the State of Amazonas accounts for 40% of this total. However, the accumulated experience and challenges in controlling malaria in this region in recent decades have not been reported. Throughout the first economic cycle during the rubber boom (1879 to 1912), malaria was recorded in the entire state, with the highest incidence in the villages near the Madeira River in the Southern part of the State of Amazonas. In the 1970s, during the second economic development cycle, the economy turned to the industrial sector and demanded a large labor force, resulting in a large migratory influx to the capital Manaus. Over time, a gradual increase in malaria transmission was observed in peri-urban areas. In the 1990s, the stimulation of agroforestry, particularly fish farming, led to the formation of permanent Anopheline breeding sites and increased malaria in settlements. The estimation of environmental impacts and the planning of measures to mitigate them, as seen in the construction of the Coari-Manaus gas pipeline, proved effective. Considering the changes occurred since the Amsterdam Conference in 1992, disease control has been based on early diagnosis and treatment, but the development of parasites that are resistant to major antimalarial drugs in Brazilian Amazon has posed a new challenge. Despite the decreased lethality and the gradual decrease in the number of malaria cases, disease elimination, which should be associated with government programs for economic development in the region, continues to be a challenge.
    Keywords Malaria ; Epidemiology ; Surveillance ; Amazon ; Medicine (General) ; R5-920 ; Medicine ; R
    Language Portuguese
    Publishing date 2015-06-01T00:00:00Z
    Publisher Sociedade Brasileira de Medicina Tropical - SBMT
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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