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Price DJ, Nekkab N, Monteiro WM, Villela DAM, Simpson JA, Lacerda MVG, White MT, Devine A. Tafenoquine following G6PD screening versus primaquine for the treatment of vivax malaria in Brazil: A cost-effectiveness analysis using a transmission model. PLoS Med 2024; 21:e1004255. [PMID: 38194420 PMCID: PMC10775976 DOI: 10.1371/journal.pmed.1004255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/29/2023] [Indexed: 01/11/2024] Open
Abstract
BACKGROUND Malaria transmission modelling has demonstrated the potential impact of semiquantitative glucose-6-phosphate dehydrogenase (G6PD) testing and treatment with single-dose tafenoquine for Plasmodium vivax radical cure but has not investigated the associated costs. This study evaluated the cost-effectiveness of P. vivax treatment with tafenoquine after G6PD testing using a transmission model. METHODS AND FINDINGS We explored the cost-effectiveness of using tafenoquine after G6PD screening as compared to usual practice (7-day low-dose primaquine (0.5 mg/kg/day) without G6PD screening) in Brazil using a 10-year time horizon with 5% discounting considering 4 scenarios: (1) tafenoquine for adults only assuming 66.7% primaquine treatment adherence; (2) tafenoquine for adults and children aged >2 years assuming 66.7% primaquine adherence; (3) tafenoquine for adults only assuming 90% primaquine adherence; and (4) tafenoquine for adults only assuming 30% primaquine adherence. The incremental cost-effectiveness ratios (ICERs) were estimated by dividing the incremental costs by the disability-adjusted life years (DALYs) averted. These were compared to a willingness to pay (WTP) threshold of US$7,800 for Brazil, and one-way and probabilistic sensitivity analyses were performed. All 4 scenarios were cost-effective in the base case analysis using this WTP threshold with ICERs ranging from US$154 to US$1,836. One-way sensitivity analyses showed that the results were most sensitive to severity and mortality due to vivax malaria, the lifetime and number of semiquantitative G6PD analysers needed, cost per malaria episode and per G6PD test strips, and life expectancy. All scenarios had a 100% likelihood of being cost-effective at the WTP threshold. The main limitations of this study are due to parameter uncertainty around our cost estimates for low transmission settings, the costs of G6PD screening, and the severity of vivax malaria. CONCLUSIONS In our modelling study that incorporated impact on transmission, tafenoquine prescribed after a semiquantitative G6PD testing was highly likely to be cost-effective in Brazil. These results demonstrate the potential health and economic importance of ensuring safe and effective radical cure.
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Affiliation(s)
- David J. Price
- Department of Infectious Diseases, The University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Victoria, Australia
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
| | - Narimane Nekkab
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Wuelton M. Monteiro
- Instituto de Pesquisa Clínica Carlos Borborema, Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Escola Superior de Ciências da Saúde, Universidade do Estado do Amazonas, Manaus, Brazil
| | - Daniel A. M. Villela
- Programa de Computacão Científica, Fundacão Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Julie A. Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
| | - Marcus V. G. Lacerda
- Instituto de Pesquisa Clínica Carlos Borborema, Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Instituto Leônidas & Maria Deane–ILMD, Fundação Oswaldo Cruz, Manaus, Brazil
| | - Michael T. White
- Institut Pasteur, Université de Paris, G5 Épidémiologie et Analyse des Maladies Infectieuses, Département de Santé Globale, F-75015 Paris, France
| | - Angela Devine
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
- Global and Tropical Health Division, Menzies School of Health Research, Charles Darwin University, Darwin, Northern Territory, Australia
- Melbourne Health Economics, Centre for Health Policy, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
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da Fonseca GC, Cavalcante LTF, Brustolini OJ, Luz PM, Pires DC, Jalil EM, Peixoto EM, Grinsztejn B, Veloso VG, Nazer S, Costa CAM, Villela DAM, Goedert GT, Santos CVBD, Rodrigues NCP, do Couto Motta F, Siqueira MM, Coelho LE, Struchiner CJ, Vasconcelos ATR. Differential Type-I Interferon Response in Buffy Coat Transcriptome of Individuals Infected with SARS-CoV-2 Gamma and Delta Variants. Int J Mol Sci 2023; 24:13146. [PMID: 37685953 PMCID: PMC10487928 DOI: 10.3390/ijms241713146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/07/2023] [Accepted: 08/20/2023] [Indexed: 09/10/2023] Open
Abstract
The innate immune system is the first line of defense against pathogens such as the acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The type I-interferon (IFN) response activation during the initial steps of infection is essential to prevent viral replication and tissue damage. SARS-CoV and SARS-CoV-2 can inhibit this activation, and individuals with a dysregulated IFN-I response are more likely to develop severe disease. Several mutations in different variants of SARS-CoV-2 have shown the potential to interfere with the immune system. Here, we evaluated the buffy coat transcriptome of individuals infected with Gamma or Delta variants of SARS-CoV-2. The Delta transcriptome presents more genes enriched in the innate immune response and Gamma in the adaptive immune response. Interactome and enriched promoter analysis showed that Delta could activate the INF-I response more effectively than Gamma. Two mutations in the N protein and one in the nsp6 protein found exclusively in Gamma have already been described as inhibitors of the interferon response pathway. This indicates that the Gamma variant evolved to evade the IFN-I response. Accordingly, in this work, we showed one of the mechanisms that variants of SARS-CoV-2 can use to avoid or interfere with the host Immune system.
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Affiliation(s)
- Guilherme C. da Fonseca
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil; (G.C.d.F.); (L.T.F.C.); (O.J.B.)
| | - Liliane T. F. Cavalcante
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil; (G.C.d.F.); (L.T.F.C.); (O.J.B.)
| | - Otávio J. Brustolini
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil; (G.C.d.F.); (L.T.F.C.); (O.J.B.)
| | - Paula M. Luz
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Debora C. Pires
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Emilia M. Jalil
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Eduardo M. Peixoto
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Beatriz Grinsztejn
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Valdilea G. Veloso
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Sandro Nazer
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Carlos A. M. Costa
- Escola Nacional de Saúde Pública, FIOCRUZ, Rio de Janeiro 21041-210, Brazil; (C.A.M.C.); (N.C.P.R.)
| | - Daniel A. M. Villela
- Programa de Computação Científica (PROCC), FIOCRUZ, Rio de Janeiro 21040-900, Brazil;
| | - Guilherme T. Goedert
- Escola de Matemática Aplicada (EMAp), Fundação Getúlio Vargas, Rio de Janeiro 22250-900, Brazil;
| | - Cleber V. B. D. Santos
- Instituto de Medicina Social Hesio Cordeiro (IMS), Universidade do Estado do Rio de Janeiro, Rio de Janeiro 20550-013, Brazil;
| | - Nadia C. P. Rodrigues
- Escola Nacional de Saúde Pública, FIOCRUZ, Rio de Janeiro 21041-210, Brazil; (C.A.M.C.); (N.C.P.R.)
- Instituto de Medicina Social Hesio Cordeiro (IMS), Universidade do Estado do Rio de Janeiro, Rio de Janeiro 20550-013, Brazil;
| | | | | | - Lara E. Coelho
- Instituto Nacional de Infectologia Evandro Chagas, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (P.M.L.); (D.C.P.); (E.M.J.); (E.M.P.); (B.G.); (V.G.V.); (S.N.); (L.E.C.)
| | - Claudio J. Struchiner
- Escola de Matemática Aplicada (EMAp), Fundação Getúlio Vargas, Rio de Janeiro 22250-900, Brazil;
- Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro 21040-360, Brazil; (F.d.C.M.); (M.M.S.)
| | - Ana Tereza R. Vasconcelos
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil; (G.C.d.F.); (L.T.F.C.); (O.J.B.)
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Ayala MJC, Valiati NCM, Bastos LS, Villela DAM. Notification of malaria cases in the Brazilian Amazon Basin from 2010 to 2020: an analysis of the reporting times. Malar J 2023; 22:49. [PMID: 36765345 PMCID: PMC9913006 DOI: 10.1186/s12936-023-04464-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 01/20/2023] [Indexed: 02/12/2023] Open
Abstract
BACKGROUND As controlling malaria transmission remains a public-health challenge in the Brazilian Amazon basin, the National Surveillance System for Malaria (SIVEP-MALARIA) has registered malaria notifications for over fifteen years helping in the decision-making on control and elimination. As a surveillance database, the system is prone to reporting delays, and knowledge about reporting patterns is essential in decisions. METHODS This study contains an analysis of temporal and state trends of reporting times in a total of 1,580,617 individual malaria reports from January 2010 to December 2020, applying procedures for statistical distribution fitting. A nowcasting technique was applied to show an estimation of number of cases using a statistical model of reporting delays. RESULTS Reporting delays increased over time for the states of Amazonas, Rondônia, Roraima, and Pará. Amapá has maintained a similar reporting delay pattern, while Acre decreased reporting delay between 2010 and 2020. Predictions were more accurate in states with lower reporting delays. The temporal evolution of reporting delays only showed a decrease in malaria reports in Acre from 2010 to 2020. CONCLUSION Malaria notifications may take days or weeks to enter the national surveillance database. The reporting times are likely to impact incidence estimation over periods when data is incomplete, whilst the impact of delays becomes smaller for retrospective analysis. Short-term assessments for the estimation of malaria incidence from the malaria control programme must deal with reporting delays.
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Affiliation(s)
- Mario J C Ayala
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil.,Politécnico Grancolombiano, Escuela de Optimización, Diseño y Automatización, Bogotá, Colombia
| | - Naiara C M Valiati
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil
| | - Leonardo S Bastos
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil
| | - Daniel A M Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil.
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Leandro ADS, Lopes RD, Amaral Martins C, Delai RM, Villela DAM, Maciel-de-Freitas R. Entomo-virological surveillance followed by serological active survey of symptomatic individuals is helpful to identify hotspots of early arbovirus transmission. Front Public Health 2022; 10:1024187. [PMID: 36388305 PMCID: PMC9651144 DOI: 10.3389/fpubh.2022.1024187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 09/27/2022] [Indexed: 01/28/2023] Open
Abstract
Arboviruses transmitted by Aedes aegypti in urban environments have spread rapidly worldwide, causing great impacts on public health. The development of reliable and timely alert signals is among the most important steps in designing accurate surveillance systems for vector-borne diseases. In July and September 2017, we conducted a pilot study to improve an existing integrated surveillance system by using entomo-virological surveillance to prioritize areas to conduct active searches for individuals with arbovirus infection symptoms. Foz do Iguaçu City has a permanent entomo-virological surveillance system with approximately 3,500 traps to capture Aedes sp. in the adult stage. The Aedes aegypti females are captured alive and human samples are submitted to RT-qPCR (real-time qPCR) screening for DENV, ZIKV, and CHIKV diagnosis. Of the 55 Ae. aegypti mosquitoes tested in July 2017, seven (12.7%) were considered positive for DENV-2 and three (5.4%) for CHIKV. In September, we tested a sample of 54 mosquitoes, and 15 (27.7%) were considered infected by DENV-2. We created 25 circumferences with 150-m radius each to perform an active survey to identify symptomatic householders. In July, we selected one circumference, and five (35.7%) patients were positive for DENV, whereas two (14.3%) for CHIKV. In September, we selected four circumferences, and, from the 21 individuals sampled, nine (42.8%) were positive for DENV-2. A statistical model with a binomial response was used to estimate the number of cases in areas without active surveys, i.e., 20 circumferences. We estimated an additional 83 symptomatic patients (95% CI: 45-145) to be found in active searches, with 38 (95% CI: 18-72) of them confirming arbovirus infection. Arbovirus detection and serotyping in mosquitoes, but also in symptomatic individuals during active surveys, can provide an alert signal of early arbovirus transmission.
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Affiliation(s)
- André de Souza Leandro
- Centro de Controle de Zoonoses da Secretaria Municipal de Saúde de Foz do Iguaçu, Paraná, Brazil,Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Renata Defante Lopes
- Centro de Controle de Zoonoses da Secretaria Municipal de Saúde de Foz do Iguaçu, Paraná, Brazil,The Instituto Latino-Americano de Economia, Sociedade e Política, Universidade Federal Latino-Americana, Foz do Iguaçu, Brazil
| | - Caroline Amaral Martins
- Centro de Controle de Zoonoses da Secretaria Municipal de Saúde de Foz do Iguaçu, Paraná, Brazil
| | - Robson Michael Delai
- One Health Laboratory at the Three-Border Tropical Medicine Center, Itaiguapy Foundation - Institute of Teaching and Research, Foz do Iguaçu, Brazil
| | | | - Rafael Maciel-de-Freitas
- Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil,Department of Arbovirology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany,*Correspondence: Rafael Maciel-de-Freitas
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5
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Leandro AS, de Castro WAC, Lopes RD, Delai RM, Villela DAM, de-Freitas RM. Citywide Integrated Aedes aegypti Mosquito Surveillance as Early Warning System for Arbovirus Transmission, Brazil. Emerg Infect Dis 2022; 28:701-706. [PMID: 35318912 PMCID: PMC8962889 DOI: 10.3201/eid2804.211547] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Infestation indices based on adult trapping predicted dengue outbreaks better than larval indices did. Arbovirus epidemiology lacks efficient and timely surveillance systems with accurate outbreak alert signals. We devised a citywide integrated surveillance system combining entomologic, epidemiologic, and entomo-virologic data gathered during 2017–2020 in Foz do Iguaçu, Brazil. We installed 3,476 adult mosquito traps across the city and inspected traps every 2 months. We compared 5 entomologic indices: traditional house and Breteau indices for larval surveys and trap positivity, adult density, and mosquitoes per inhabitant indices for adult trapping. We screened for dengue, Zika, and chikungunya viruses in live adult Aedes aegypti mosquitoes collected from traps. Indices based on adult mosquito sampling had higher outbreak predictive values than larval indices, and we were able to build choropleth maps of infestation levels <36 h after each round of trap inspection. Locating naturally infected vectors provides a timely support tool for local public health managers to prioritize areas for intervention response to prevent virus outbreaks.
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Ayala MJC, Bastos LS, Villela DAM. On multifactorial drivers for malaria rebound in Brazil: a spatio-temporal analysis. Malar J 2022; 21:52. [PMID: 35177095 PMCID: PMC8851784 DOI: 10.1186/s12936-021-04037-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 12/24/2021] [Indexed: 12/03/2022] Open
Abstract
Background Malaria incidence in Brazil reversed its decreasing trend when cases from recent years, as recent as 2015, exhibited an increase in the Brazilian Amazon basin, the area with the highest transmission of Plasmodium vivax and Plasmodium falciparum. In fact, an increase of more than 20% in the years 2016 and 2017 revealed possible vulnerabilities in the national malaria-control programme. Methods Factors potentially associated with this reversal, including migration, economic activities, and deforestation, were studied. Past incidences of malaria cases due to P. vivax and P. falciparum were analysed with a spatio-temporal Bayesian model using more than 5 million individual records of malaria cases from January of 2003 to December of 2018 in the Brazilian Amazon to establish the municipalities with unexpected increases in cases. Results Plasmodium vivax incidence surpassed the past trends in Amazonas (AM), Amapá (AP), Acre (AC), Pará (PA), Roraima (RR), and Rondônia (RO), implying a rebound of these states between 2015 and 2018. On the other hand, P. falciparum also surpassed the past trends in AM, AC, AP, and RR with less severity than P. vivax incidence. Outdoor activities, agricultural activities, accumulated deforestation, and travelling might explain the rebound in malaria cases in RR, AM, PA, and RO, mainly in P. vivax cases. These variables, however, did not explain the rebound of either P. vivax and P. falciparum cases in AC and AP states or P. falciparum cases in RR and RO states. Conclusion The Amazon basin has experienced an unexpected increase in malaria cases, mainly in P. vivax cases, in some regions of the states of Amazonas, Acre, Pará, Amapá, Roraima, and Rondônia from 2015 to 2018 and agricultural activities, outdoor activities, travelling activities, and accumulated deforestation appear linked to this rebound of cases in particular regions with different impact. This shows the multifactorial effects and the heterogeneity of the Amazon basin, boosting the necessity of focusing the malaria control programme on particular social, economic, and environmental conditions. Supplementary Information The online version contains supplementary material available at 10.1186/s12936-021-04037-x.
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Affiliation(s)
- Mario J C Ayala
- Fundação Oswaldo Cruz (Fiocruz), Programa de Computação Científica, Av. Brasil, 4365-Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Leonardo S Bastos
- Fundação Oswaldo Cruz (Fiocruz), Programa de Computação Científica, Av. Brasil, 4365-Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Daniel A M Villela
- Fundação Oswaldo Cruz (Fiocruz), Programa de Computação Científica, Av. Brasil, 4365-Manguinhos, Rio de Janeiro, 21040-900, Brazil.
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Guimarães R, Villela DAM, Xavier DR, Saldanha R, Barcellos C, de Freitas CM, Portela MC. Increasing impact of COVID-19 on young adults: evidence from hospitalisations in Brazil. Public Health 2021; 198:297-300. [PMID: 34507135 PMCID: PMC8349686 DOI: 10.1016/j.puhe.2021.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 07/27/2021] [Accepted: 08/03/2021] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Concerns about the increasing impact of severe COVID-19 in younger individuals in Brazil came after a recent synchronised country-wide wave of cases in Brazil. This communication analyses how hospitalisations due to COVID-19 changed in the age groups 18-49 years and ≥70 years. STUDY DESIGN Longitudinal study based on secondary data. METHODS Data from SIVEP-Gripe, a public and open-access database of Severe Acute Respiratory Illness records (including COVID-19 notifications), were used in this study. Statistical control charts examined changes in the magnitude and variation of younger (18-49 years) and older (≥70 years) adults who were hospitalised between 15th March 2020 and 19th June 2021. RESULTS During the few first weeks of the pandemic in Brazil, the number of COVID-19 hospitalisations increased in older adults but decreased in younger adults. Subsequently, hospitalisations reached statistical control zones in epidemiological weeks (EW) 19-48 of 2020 (EW 19-48/2020) and EW 03-05/2021 (18-49 y, mean = 26.1%; ≥70 y, mean = 32.8%). Between EW 49/2020 and EW 02/2021, the number of hospitalisations of younger adults dropped to levels below the lower control limit. In contrast, the number of hospitalisations of older adults surpassed the upper limit of the corresponding statistical control zones. However, from EW 06/2021, numbers of hospitalisations changed from statistical control zones, with hospitalisations of younger adults increasing and reaching 44.9% in EW 24/2021 and hospitalisations of older adults decreasing until EW 19/2021 (14.1%) and reaching 17.3% in EW 24/2021. CONCLUSIONS An increasing number of COVID-19 hospitalisations were observed in younger adults from EW 06/2021. This could be a result of the successful vaccination programme in older adults, who were initially prioritised, and possibly an increased exposure to highly transmissible variants of COVID-19 in younger adults who had to go to work in the absence of social protection (i.e. government financial support). Potential consequences of COVID-19 hospitalisations in younger adults could include a reduced life expectancy of the population and an increased number of people unable to perform daily activities due to post-COVID-19 conditions.
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Affiliation(s)
- R Guimarães
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - D A M Villela
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - D R Xavier
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - R Saldanha
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - C Barcellos
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - C M de Freitas
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil
| | - M C Portela
- Fiocruz COVID-19 Observatory, Oswaldo Cruz Foundation, Brazil.
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Balieiro AAS, Siqueira AM, Melo GC, Monteiro WM, Sampaio VS, Mueller I, Lacerda MVG, Villela DAM. Short-Time Recurrences of Plasmodium vivax Malaria as a Public Health Proxy for Chloroquine-Resistance Surveillance: A Spatio-Temporal Study in the Brazilian Amazon. Int J Environ Res Public Health 2021; 18:ijerph18105061. [PMID: 34064738 PMCID: PMC8150757 DOI: 10.3390/ijerph18105061] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/25/2021] [Accepted: 04/30/2021] [Indexed: 12/17/2022]
Abstract
In Brazil, malaria caused by Plasmodium vivax presents control challenges due to several reasons, among them the increasing possibility of failure of P. vivax treatment due to chloroquine-resistance (CQR). Despite limited reports of CQR, more extensive studies on the actual magnitude of resistance are still needed. Short-time recurrences of malaria cases were analyzed in different transmission scenarios over three years (2005, 2010, and 2015), selected according to malaria incidence. Multilevel models (binomial) were used to evaluate association of short-time recurrences with variables such as age. The zero-inflated Poisson scan model (scanZIP) was used to detect spatial clusters of recurrences up to 28 days. Recurrences compose less than 5% of overall infection, being more frequent in the age group under four years. Recurrences slightly increased incidence. No fixed clusters were detected throughout the period, although there are clustering sites, spatially varying over the years. This is the most extensive analysis of short-time recurrences worldwide which addresses the occurrence of P. vivax CQR. As an important step forward in malaria elimination, policymakers should focus their efforts on young children, with an eventual shift in the first line of malaria treatment to P. vivax.
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Affiliation(s)
- Antonio A. S. Balieiro
- Instituto Leônidas & Maria Deane, Fundação Oswaldo Cruz (ILMD/Fiocruz), Amazonas 69057-070, Brazil; (A.A.S.B.); (M.V.G.L.)
- Programa de Pós-Graduação em Biologia Parasitaria—Instituto Oswaldo Cruz (IOC/Fiocruz), Rio de Janeiro 21040-900, Brazil
| | - Andre M. Siqueira
- Instituto Nacional de Infectologia Evandro Chagas, Fundação Oswaldo Cruz (INI/Fiocruz), Rio de Janeiro 21040-360, Brazil;
| | - Gisely C. Melo
- Fundação de Medicina Tropical Heitor Vieira Dourado (FMT-HVD), Amazonas 69040-000, Brazil; (G.C.M.); (W.M.M.); (V.S.S.)
- Programa de Pós Graduação em Medicina Tropical—Universidade do Estado do Amazonas (UEA), Amazonas 69040-000, Brazil
| | - Wuelton M. Monteiro
- Fundação de Medicina Tropical Heitor Vieira Dourado (FMT-HVD), Amazonas 69040-000, Brazil; (G.C.M.); (W.M.M.); (V.S.S.)
- Programa de Pós Graduação em Medicina Tropical—Universidade do Estado do Amazonas (UEA), Amazonas 69040-000, Brazil
| | - Vanderson S. Sampaio
- Fundação de Medicina Tropical Heitor Vieira Dourado (FMT-HVD), Amazonas 69040-000, Brazil; (G.C.M.); (W.M.M.); (V.S.S.)
- Programa de Pós Graduação em Medicina Tropical—Universidade do Estado do Amazonas (UEA), Amazonas 69040-000, Brazil
- Fundação de Vigilância em Saúde (FVS), Amazonas 69093-018, Brazil
| | - Ivo Mueller
- Walter & Elisa Hall Institute, Melbourne 3052, Australia;
- Pasteur Institute, 75015 Paris, France
| | - Marcus V. G. Lacerda
- Instituto Leônidas & Maria Deane, Fundação Oswaldo Cruz (ILMD/Fiocruz), Amazonas 69057-070, Brazil; (A.A.S.B.); (M.V.G.L.)
- Fundação de Medicina Tropical Heitor Vieira Dourado (FMT-HVD), Amazonas 69040-000, Brazil; (G.C.M.); (W.M.M.); (V.S.S.)
- Programa de Pós Graduação em Medicina Tropical—Universidade do Estado do Amazonas (UEA), Amazonas 69040-000, Brazil
| | - Daniel A. M. Villela
- Programa de Pós-Graduação em Biologia Parasitaria—Instituto Oswaldo Cruz (IOC/Fiocruz), Rio de Janeiro 21040-900, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz (PROCC/Fiocruz), Rio de Janeiro 21040-360, Brazil
- Correspondence:
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9
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Coelho FC, Lana RM, Cruz OG, Villela DAM, Bastos LS, Pastore y Piontti A, Davis JT, Vespignani A, Codeço CT, Gomes MFC. Assessing the spread of COVID-19 in Brazil: Mobility, morbidity and social vulnerability. PLoS One 2020; 15:e0238214. [PMID: 32946442 PMCID: PMC7500629 DOI: 10.1371/journal.pone.0238214] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 08/12/2020] [Indexed: 11/18/2022] Open
Abstract
Brazil detected community transmission of COVID-19 on March 13, 2020. In this study we identified which areas in the country were the most vulnerable for COVID-19, both in terms of the risk of arrival of cases, the risk of sustained transmission and their social vulnerability. Probabilistic models were used to calculate the probability of COVID-19 spread from São Paulo and Rio de Janeiro, the initial hotspots, using mobility data from the pre-epidemic period, while multivariate cluster analysis of socio-economic indices was done to identify areas with similar social vulnerability. The results consist of a series of maps of effective distance, outbreak probability, hospital capacity and social vulnerability. They show areas in the North and Northeast with high risk of COVID-19 outbreak that are also highly socially vulnerable. Later, these areas would be found the most severely affected. The maps produced were sent to health authorities to aid in their efforts to prioritize actions such as resource allocation to mitigate the effects of the pandemic. In the discussion, we address how predictions compared to the observed dynamics of the disease.
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Affiliation(s)
- Flávio C. Coelho
- Escola de Matemática Aplicada, Fundação Getulio Vargas, Rio de Janeiro, Brazil
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
| | - Raquel M. Lana
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Oswaldo G. Cruz
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Daniel A. M. Villela
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Leonardo S. Bastos
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Ana Pastore y Piontti
- Laboratory for the Modeling of Biological and Socio-technical Systems, Northeastern University, Boston, MA, United States of America
| | - Jessica T. Davis
- Laboratory for the Modeling of Biological and Socio-technical Systems, Northeastern University, Boston, MA, United States of America
| | - Alessandro Vespignani
- Laboratory for the Modeling of Biological and Socio-technical Systems, Northeastern University, Boston, MA, United States of America
- ISI Foundation, Turin, Italy
| | - Claudia T. Codeço
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Marcelo F. C. Gomes
- Núcleo de Métodos Analíticos para Vigilância em Saúde Pública, Rio de Janeiro, Brazil
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
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10
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Ayala MJC, Villela DAM. Early transmission of sensitive strain slows down emergence of drug resistance in Plasmodium vivax. PLoS Comput Biol 2020; 16:e1007945. [PMID: 32555701 PMCID: PMC7363008 DOI: 10.1371/journal.pcbi.1007945] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 06/29/2020] [Accepted: 05/13/2020] [Indexed: 11/19/2022] Open
Abstract
The spread of drug resistance of Plasmodium falciparum and Plasmodium vivax parasites is a challenge towards malaria elimination. P. falciparum has shown an early and severe drug resistance in comparison to P. vivax in various countries. In fact, P. vivax differs in its life cycle and treatment in various factors: development and duration of sexual parasite forms differ, symptoms severity are unequal, relapses present only in P. vivax cases and the Artemisinin-based combination therapy (ACT) is only mandatory in P. falciparum cases. We compared the spread of drug resistance for both species through two compartmental models using ordinary differential equations. The model structure describes how sensitive and resistant parasite strains infect a human population treated with antimalarials. We found that an early transmission,i.e., before treatment and low effectiveness of drug coverage, supports the prevalence of sensitive parasites delaying the emergence of resistant P. vivax. These results imply that earlier attention of both symptomatic cases and reservoirs of P. vivax are essential in controlling transmission but also accelerate the spread of drug resistance.
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Affiliation(s)
- Mario J. C. Ayala
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil
| | - Daniel A. M. Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil
- * E-mail:
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11
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Bastos LS, Niquini RP, Lana RM, Villela DAM, Cruz OG, Coelho FC, Codeço CT, Gomes MFC. COVID-19 and hospitalizations for SARI in Brazil: a comparison up to the 12th epidemiological week of 2020. CAD SAUDE PUBLICA 2020; 36:e00070120. [PMID: 32321075 DOI: 10.1590/0102-311x00070120] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 11/22/2022] Open
Abstract
Surveillance of the severe acute respiratory illness (SARI) in Brazil aims to characterize the circulation of the Influenza A and B viruses in hospitalized cases and deaths, having been expanded in 2012 to include other respiratory viruses. COVID-19 was detected in Brazil for the time in the 9th epidemiological week of 2020, and the test for the SARS-CoV-2 virus was included in the surveillance protocol starting in the 12th epidemiological week. This study's objective was to investigate the pattern of hospitalizations for SARI in Brazil since the entry of SARS-CoV-2, comparing the temporal and age profiles and laboratory results to the years 2010 through 2019. In 2020, hospitalizations for SARI, compiled from the date of the first confirmed case of COVID-19 up to the 12th week, exceeded the numbers observed during the same period in each of the previous 10 years. The age bracket over 60 years was the most heavily affected, at higher than historical levels. There was a considerable increase in negative laboratory tests, suggesting circulation of a different virus from those already present in the panel. We concluded that the increase in hospitalizations for SARI, the lack of specific information on the etiological agent, and the predominance of cases among the elderly during the same period in which there was an increase in the number of new cases of COVID-19 are all consistent with the hypothesis that severe cases of COVID-19 are already being detected by SARI surveillance, placing an overload on the health system. The inclusion of testing for SARS-CoV-2 in the SARI surveillance protocol and the test's effective nationwide deployment are extremely important for monitoring the evolution of severe COVID-19 cases in Brazil.
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Affiliation(s)
- Leonardo Soares Bastos
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil.,Department of Infectious Diseases Epidemiology, London School of Hygiene and Tropical Medicine, London, U.K
| | - Roberta Pereira Niquini
- Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Raquel Martins Lana
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil
| | - Daniel A M Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil
| | - Oswaldo G Cruz
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil
| | - Flávio C Coelho
- Escola de Matemática Aplicada, Fundação Getúlio Vargas, Rio de Janeiro, Brasil
| | - Claudia T Codeço
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil
| | - Marcelo F C Gomes
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil
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12
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Garcia GA, Hoffmann AA, Maciel-de-Freitas R, Villela DAM. Aedes aegypti insecticide resistance underlies the success (and failure) of Wolbachia population replacement. Sci Rep 2020; 10:63. [PMID: 31919396 PMCID: PMC6952458 DOI: 10.1038/s41598-019-56766-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/05/2019] [Indexed: 12/12/2022] Open
Abstract
Mosquitoes that carry Wolbachia endosymbionts may help control the spread of arboviral diseases, such as dengue, Zika and chikungunya. Wolbachia frequencies systematically increase only when the frequency-dependent advantage due to cytoplasmic incompatibility exceeds frequency-independent costs, which may be intrinsic to the Wolbachia and/or can be associated with the genetic background into which Wolbachia are introduced. Costs depend on field conditions such as the environmental pesticide load. Introduced mosquitoes need adequate protection against insecticides to ensure survival after release. We model how insecticide resistance of transinfected mosquitoes determines the success of local Wolbachia introductions and link our theoretical results to field data. Two Ae. aegypti laboratory strains carrying Wolbachia were released in an isolated district of Rio de Janeiro, Brazil: wMelBr (susceptible to pyrethroids) and wMelRio (resistant to pyrethroids). Our models elucidate why releases of the susceptible strain failed to result in Wolbachia establishment, while releases of the resistant strain led to Wolbachia transforming the native Ae. aegypti population. The results highlight the importance of matching insecticide resistance levels in release stocks to those in the target natural populations during Wolbachia deployment.
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Affiliation(s)
- Gabriela A Garcia
- Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (IOC/FIOCRUZ), Rio de Janeiro, Brazil
| | | | - Rafael Maciel-de-Freitas
- Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (IOC/FIOCRUZ), Rio de Janeiro, Brazil
| | - Daniel A M Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz (PROCC/FIOCRUZ), Rio de Janeiro, Brazil.
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13
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Abstract
Forecasting in the domain of infectious diseases aims at estimating the number of cases ahead of time during an epidemic, hence fundamentally requires understanding its dynamics. In fact, estimates about the dynamics help to predict the number of cases in an epidemic, which will depend on determining a few of defining factors such as its starting point, the turning point, growth factor, and the size of the epidemic in total number of cases. In this work a phenomenological model deals with a practical aspect often disregarded in such studies, namely that health surveillance produces counts in batches when aggregated over discrete time, such as days, weeks, months, or other time units. This model enables derivation of equations that permit both estimating key dynamics parameters and forecasting. Results using both severe acute respiratory illness data and synthetic data show that the forecasting follows very well over time the dynamics and is resilient with statistical noise, but has a delay effect due to the discrete time.
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Affiliation(s)
- Daniel A M Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
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14
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Strugarek M, Dufour L, Vauchelet N, Almeida L, Perthame B, Villela DAM. Oscillatory regimes in a mosquito population model with larval feedback on egg hatching. J Biol Dyn 2019; 13:269-300. [PMID: 31046607 DOI: 10.1080/17513758.2019.1593524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 02/21/2019] [Indexed: 06/09/2023]
Abstract
Understanding mosquitoes life cycle is of great interest presently because of the increasing impact of vector borne diseases in several countries. There is evidence of oscillations in mosquito populations independent of seasonality, still unexplained, based on observations both in laboratories and in nature. We propose a simple mathematical model of egg hatching enhancement by larvae which produces such oscillations that conveys a possible explanation. We propose both a theoretical analysis, based on slow-fast dynamics and Hopf bifurcation, and numerical investigations in order to shed some light on the mechanisms at work in this model.
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Affiliation(s)
- Martin Strugarek
- a AgroParisTech , Paris Cedex 05 , France
- b Sorbonne Université, CNRS, Université de Paris, Inria, Laboratoire Jacques-Louis Lions UMR7598 , Paris , France
| | - Laetitia Dufour
- b Sorbonne Université, CNRS, Université de Paris, Inria, Laboratoire Jacques-Louis Lions UMR7598 , Paris , France
| | - Nicolas Vauchelet
- c LAGA - UMR 7539, Institut Galilée, Université Paris 13 , Villetaneuse , France
| | - Luis Almeida
- b Sorbonne Université, CNRS, Université de Paris, Inria, Laboratoire Jacques-Louis Lions UMR7598 , Paris , France
| | - Benoît Perthame
- b Sorbonne Université, CNRS, Université de Paris, Inria, Laboratoire Jacques-Louis Lions UMR7598 , Paris , France
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15
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Bastos LS, Economou T, Gomes MFC, Villela DAM, Coelho FC, Cruz OG, Stoner O, Bailey T, Codeço CT. A modelling approach for correcting reporting delays in disease surveillance data. Stat Med 2019; 38:4363-4377. [PMID: 31292995 PMCID: PMC6900153 DOI: 10.1002/sim.8303] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 05/13/2019] [Accepted: 06/03/2019] [Indexed: 11/05/2022]
Abstract
One difficulty for real-time tracking of epidemics is related to reporting delay. The reporting delay may be due to laboratory confirmation, logistical problems, infrastructure difficulties, and so on. The ability to correct the available information as quickly as possible is crucial, in terms of decision making such as issuing warnings to the public and local authorities. A Bayesian hierarchical modelling approach is proposed as a flexible way of correcting the reporting delays and to quantify the associated uncertainty. Implementation of the model is fast due to the use of the integrated nested Laplace approximation. The approach is illustrated on dengue fever incidence data in Rio de Janeiro, and severe acute respiratory infection data in the state of Paraná, Brazil.
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Affiliation(s)
- Leonardo S Bastos
- Scientific Computing Program, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | | | - Marcelo F C Gomes
- Scientific Computing Program, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Daniel A M Villela
- Scientific Computing Program, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Flavio C Coelho
- School of Applied Mathematics, Getulio Vargas Foundation, Rio de Janeiro, Brazil
| | - Oswaldo G Cruz
- Scientific Computing Program, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Oliver Stoner
- Department of Mathematics, University of Exeter, Exeter, UK
| | - Trevor Bailey
- Department of Mathematics, University of Exeter, Exeter, UK
| | - Claudia T Codeço
- Scientific Computing Program, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
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16
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Garcia GDA, Sylvestre G, Aguiar R, da Costa GB, Martins AJ, Lima JBP, Petersen MT, Lourenço-de-Oliveira R, Shadbolt MF, Rašić G, Hoffmann AA, Villela DAM, Dias FBS, Dong Y, O’Neill SL, Moreira LA, Maciel-de-Freitas R. Matching the genetics of released and local Aedes aegypti populations is critical to assure Wolbachia invasion. PLoS Negl Trop Dis 2019; 13:e0007023. [PMID: 30620733 PMCID: PMC6338382 DOI: 10.1371/journal.pntd.0007023] [Citation(s) in RCA: 100] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 01/18/2019] [Accepted: 11/26/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Traditional vector control approaches such as source reduction and insecticide spraying have limited effect on reducing Aedes aegypti population. The endosymbiont Wolbachia is pointed as a promising tool to mitigate arbovirus transmission and has been deployed worldwide. Models predict a rapid increase on the frequency of Wolbachia-positive Ae. aegypti mosquitoes in local settings, supported by cytoplasmic incompatibility (CI) and high maternal transmission rate associated with the wMelBr strain. METHODOLOGY/PRINCIPLE FINDINGS Wolbachia wMelBr strain was released for 20 consecutive weeks after receiving >87% approval of householders of the isolated community of Tubiacanga, Rio de Janeiro. wMelBr frequency plateued~40% during weeks 7-19, peaked 65% but dropped as releases stopped. A high (97.56%) maternal transmission was observed. Doubling releases and deploying mosquitoes with large wing length and low laboratory mortality produced no detectable effects on invasion trend. By investigating the lab colony maintenance procedures backwardly, pyrethroid resistant genotypes in wMelBr decreased from 68% to 3.5% after 17 generations. Therefore, we initially released susceptible mosquitoes in a local population highly resistant to pyrethroids which, associated with the over use of insecticides by householders, ended jeopardizing Wolbachia invasion. A new strain (wMelRio) was produced after backcrossing wMelBr females with males from field to introduce mostly pyrethroid resistance alleles. The new strain increased mosquito survival but produced relevant negative effects on Ae. aegypti fecundity traits, reducing egg clutche size and egg hatch. Despite the cost on fitness, wMelRio successful established where wMelBr failed, revealing that matching the local population genetics, especially insecticide resistance background, is critical to achieve invasion. CONCLUSIONS/SIGNIFICANCE Local householders support was constantly high, reaching 90% backing on the second release (wMelRio strain). Notwithstanding the drought summer, the harsh temperature recorded (daily average above 30°C) did not seem to affect the expression of maternal transmission of wMel on a Brazilian background. Wolbachia deployment should match the insecticide resistance profile of the wild population to achieve invasion. Considering pyrethroid-resistance is a widely distributed phenotype in natural Ae. aegypti populations, future Wolbachia deployments must pay special attention in maintaining insecticide resistance in lab colonies for releases.
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Affiliation(s)
- Gabriela de Azambuja Garcia
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Gabriel Sylvestre
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Raquel Aguiar
- Serviço de Jornalismo e Comunicação, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | | | - Ademir Jesus Martins
- Laboratório de Fisiologia e Controle de Artrópodes Vetores, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)/CNPq, Rio de Janeiro, Brazil
| | - José Bento Pereira Lima
- Laboratório de Fisiologia e Controle de Artrópodes Vetores, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)/CNPq, Rio de Janeiro, Brazil
| | - Martha T. Petersen
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Ricardo Lourenço-de-Oliveira
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)/CNPq, Rio de Janeiro, Brazil
| | - Marion F. Shadbolt
- School of BioSciences, Bio21 Institute, University of Melbourne, Parkville, Victoria, Australia
| | - Gordana Rašić
- School of BioSciences, Bio21 Institute, University of Melbourne, Parkville, Victoria, Australia
| | - Ary A. Hoffmann
- School of BioSciences, Bio21 Institute, University of Melbourne, Parkville, Victoria, Australia
| | | | | | - Yi Dong
- Institute of Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
| | - Scott L. O’Neill
- Institute of Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
| | - Luciano A. Moreira
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)/CNPq, Rio de Janeiro, Brazil
- Instituto de Pesquisas René Rachou, Belo Horizonte, Fiocruz, Minas Gerais, Brazil
| | - Rafael Maciel-de-Freitas
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)/CNPq, Rio de Janeiro, Brazil
- * E-mail:
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17
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Codeço CT, Villela DAM, Coelho FC. Estimating the effective reproduction number of dengue considering temperature-dependent generation intervals. Epidemics 2018; 25:101-111. [PMID: 29945778 DOI: 10.1016/j.epidem.2018.05.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 05/14/2018] [Accepted: 05/29/2018] [Indexed: 01/17/2023] Open
Abstract
The effective reproduction number, Rt, is a measure of transmission that can be calculated from standard incidence data to timely detect the beginning of epidemics. It has being increasingly used for surveillance of directly transmitted diseases. However, current methods for Rt estimation do not apply for vector borne diseases, whose transmission cycle depends on temperature. Here we propose a method that provides dengue's Rt estimates in the presence of temperature-mediated seasonality and apply this method to simulated and real data from two cities in Brazil where dengue is endemic. The method shows good precision in the simulated data. When applied to the real data, it shows differences in the transmission profile of the two cities and identifies periods of higher transmission.
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Affiliation(s)
- Claudia T Codeço
- Scientific Computing Program/Oswaldo Cruz Foundation, Rio de Janeiro, Brazil.
| | - Daniel A M Villela
- Scientific Computing Program/Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Flavio C Coelho
- School of Applied Mathematics/Getulio Vargas Foundation, Rio de Janeiro, Brazil
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18
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Lima LRP, Fernandes LEBC, Villela DAM, Morgado MG, Pilotto JH, de Paula VS. Co-infection of human herpesvirus type 2 (HHV-2) and human immunodeficiency virus (HIV) among pregnant women in Rio de Janeiro, Brazil. AIDS Care 2017; 30:378-382. [PMID: 28914079 DOI: 10.1080/09540121.2017.1378798] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Pregnant women who are infected with the Human Immunodeficiency Virus (HIV) are particularly vulnerable to severe and recurrent infections with Human Herpesvirus 2 (HHV-2). Neonatal transmission of HHV-2 has been associated with malformations and neurological sequelae in infants, which makes it very important to perform antenatal monitoring for genital herpes. In the study, 134 pregnant women infected with HIV were tested for HHV-2 IgM and IgG using an enzyme-linked immunosorbent assay (ELISA) and had HHV-2 DNA analyzed by Real Time Polymerase Chain Reaction (qPCR). Fisher's exact test was applied to analyze the epidemiological dates (p < 0.05). A total of 59.7% of the pregnant women infected with HIV had HHV-2 IgG and 3.75% of them showed HHV-2 viremia. HHV-2 IgM was found in 6% of the pregnant women and 25% of them had HHV-2 viremia. The risk factors associated with HHV-2 seropositive were age under 20 and a CD4/CD8 ratio > 1. Our study found high HHV-2/HIV coinfection prevalence and HHV-2 viremia among patients with recurrent and primary genital infection, reinforcing the need of prevention and control of HHV-2 infection in order to avoid this virus transmission.
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Affiliation(s)
- Lyana Rodrigues Pinto Lima
- a Laboratório de Desenvolvimento Tecnológico em Virologia, Pavilhão Hélio e Peggy Pereira , Instituto Oswaldo Cruz , Rio de Janeiro - RJ , Brasil
| | | | - Daniel A M Villela
- c Programa de Computação Científica , Fundação Oswaldo Cruz , Rio de Janeiro-RJ , Brazil
| | - Mariza Gonçalves Morgado
- d Laboratório de AIDS e Imunologia Molecular, Pav. Leônidas Deane , Instituto Oswaldo Cruz , Rio de Janeiro- RJ , Brasil
| | - José Henrique Pilotto
- b Hospital Geral de Nova Iguaçu - HGNI , Rio de Janeiro-RJ , Brasil.,d Laboratório de AIDS e Imunologia Molecular, Pav. Leônidas Deane , Instituto Oswaldo Cruz , Rio de Janeiro- RJ , Brasil
| | - Vanessa Salete de Paula
- a Laboratório de Desenvolvimento Tecnológico em Virologia, Pavilhão Hélio e Peggy Pereira , Instituto Oswaldo Cruz , Rio de Janeiro - RJ , Brasil
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19
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Coelho FC, Durovni B, Saraceni V, Lemos C, Codeco CT, Camargo S, de Carvalho LM, Bastos L, Arduini D, Villela DAM, Armstrong M. Higher incidence of Zika in adult women than adult men in Rio de Janeiro suggests a significant contribution of sexual transmission from men to women. Int J Infect Dis 2016; 51:128-132. [PMID: 27664930 DOI: 10.1016/j.ijid.2016.08.023] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/16/2016] [Accepted: 08/27/2016] [Indexed: 10/21/2022] Open
Abstract
OBJECTIVES The recent emergence of Zika in Brazil and its association with an increased rate of congenital malformations has raised concerns over its impact on the birth rate in the country. Using data on the incidence of Zika in 2015-2016 and dengue in 2013 and 2015-2016 for the city of Rio de Janeiro (population 6.4 million), a massive increase of Zika in women compared to men was documented. METHODS The age-adjusted incidence was compared between men and women. A negative binomial Poisson generalized linear model was fitted to the Zika incidence data to determine the significance of sexual transmission statistically. RESULTS Even after correcting for the bias due to the systematic testing of pregnant women for Zika, there were found to be 90% more registered cases per 100000 women than men in the sexually active age group (15-65 years); this was not the case for age groups <15 years and >65 years. Assuming that infected men transmit the disease to women in their semen, but that the converse is not true, some extra incidence in women is to be expected. An alternate hypothesis would be that women visit doctors more often than men. To test this, the incidence of dengue fever was compared in men and women in 2015 and in 2013 (before Zika reached Rio de Janeiro): in both years, women were 30% more likely to be reported with dengue. CONCLUSION Women in the sexually active age group are far more likely to get Zika than men (+90% increase); sexual transmission is the most probable cause. Women in the 15-65 years age group are also 30% more likely to be reported with dengue than men, which is probably due to women being more careful with their health.
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Affiliation(s)
| | | | | | | | | | - Sabrina Camargo
- Fundação Getulio Vargas, Praia de Botafogo, 190, Rio de Janeiro, Brazil
| | - Luiz Max de Carvalho
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil; Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
| | - Leonardo Bastos
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | | | - Daniel A M Villela
- Programa de Computação Científica, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Margaret Armstrong
- Fundação Getulio Vargas, Praia de Botafogo, 190, Rio de Janeiro, Brazil; MINES Paristech, PSL Research University, CERNA Centre for Industrial Economy, i3, CNRS UMR 9217, Paris, France
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Villela DAM, Codeço CT, Figueiredo F, Garcia GA, Maciel-de-Freitas R, Struchiner CJ. A Bayesian Hierarchical Model for Estimation of Abundance and Spatial Density of Aedes aegypti. PLoS One 2015; 10:e0123794. [PMID: 25906323 PMCID: PMC4408040 DOI: 10.1371/journal.pone.0123794] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 03/06/2015] [Indexed: 11/22/2022] Open
Abstract
Strategies to minimize dengue transmission commonly rely on vector control, which aims to maintain Ae. aegypti density below a theoretical threshold. Mosquito abundance is traditionally estimated from mark-release-recapture (MRR) experiments, which lack proper analysis regarding accurate vector spatial distribution and population density. Recently proposed strategies to control vector-borne diseases involve replacing the susceptible wild population by genetically modified individuals' refractory to the infection by the pathogen. Accurate measurements of mosquito abundance in time and space are required to optimize the success of such interventions. In this paper, we present a hierarchical probabilistic model for the estimation of population abundance and spatial distribution from typical mosquito MRR experiments, with direct application to the planning of these new control strategies. We perform a Bayesian analysis using the model and data from two MRR experiments performed in a neighborhood of Rio de Janeiro, Brazil, during both low- and high-dengue transmission seasons. The hierarchical model indicates that mosquito spatial distribution is clustered during the winter (0.99 mosquitoes/premise 95% CI: 0.80-1.23) and more homogeneous during the high abundance period (5.2 mosquitoes/premise 95% CI: 4.3-5.9). The hierarchical model also performed better than the commonly used Fisher-Ford's method, when using simulated data. The proposed model provides a formal treatment of the sources of uncertainty associated with the estimation of mosquito abundance imposed by the sampling design. Our approach is useful in strategies such as population suppression or the displacement of wild vector populations by refractory Wolbachia-infected mosquitoes, since the invasion dynamics have been shown to follow threshold conditions dictated by mosquito abundance. The presence of spatially distributed abundance hotspots is also formally addressed under this modeling framework and its knowledge deemed crucial to predict the fate of transmission control strategies based on the replacement of vector populations.
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Affiliation(s)
| | - Claudia T. Codeço
- Fundação Oswaldo Cruz, Programa de Computação Científica—Rio de Janeiro, Brazil
| | - Felipe Figueiredo
- Fundação Oswaldo Cruz, Programa de Computação Científica—Rio de Janeiro, Brazil
| | - Gabriela A. Garcia
- Fundação Oswaldo Cruz, Departamento de Entomologia, Laboratório de Transmissores de Hematozoários—Rio de Janeiro, Brazil
| | - Rafael Maciel-de-Freitas
- Fundação Oswaldo Cruz, Departamento de Entomologia, Laboratório de Transmissores de Hematozoários—Rio de Janeiro, Brazil
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