Walter Massa Ramalho

Dr. Walter Massa Ramalho

orcid

Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 February 2006 in Emerging Infectious Diseases
Verified
Journal Article
Open access
LMLenildo de Moura
Lenildo de Moura
LBLilian Maria Garcia Bahia-Oliveira
Lilian Maria Garcia Bahia-Oliveira
MWMarcelo Y. Wada
Marcelo Y. Wada
JJJeffrey L. Jones
Jeffrey L. Jones
STSuely H. Tuboi
Suely H. Tuboi
DGDenise O. Garrett
Denise O. Garrett
Water was the suspected vehicle of Toxoplasma gondii dissemination in a toxoplasmosis outbreak in Brazil. A case-control study and geographic mapping of cases were performed. T. gondii was isolated directly from the implicated water and genotyped as SAG 2 type I.

1 July 2014 in The Lancet Infectious Diseases
Verified
Journal Article
Open access
RLRachel Lowe
Rachel Lowe
CBChristovam Barcellos
Christovam Barcellos
CCCaio A S Coelho
Caio A S Coelho
TBTrevor C Bailey
Trevor C Bailey
GCGiovanini Evelim Coelho
Giovanini Evelim Coelho
XRXavier Rodó
Xavier Rodó
With more than a million spectators expected to travel among 12 different cities in Brazil during the football World Cup, June 12-July 13, 2014, the risk of the mosquito-transmitted disease dengue fever is a concern. We addressed the potential for a dengue epidemic during the tournament, using a probabilistic forecast of dengue risk for the 553 microregions of Brazil, with risk level warnings for the 12 cities where matches will be played. We obtained real-time seasonal climate forecasts from several international sources (European Centre for Medium-Range Weather Forecasts [ECMWF], Met Office, Meteo-France and Centro de Previsão de Tempo e Estudos Climáticos [CPTEC]) and the observed dengue epidemiological situation in Brazil at the forecast issue date as provided by the Ministry of Health. Using this information we devised a spatiotemporal hierarchical Bayesian modelling framework that enabled dengue warnings to be made 3 months ahead. By assessing the past performance of the forecasting system using observed dengue incidence rates for June, 2000-2013, we identified optimum trigger alert thresholds for scenarios of medium-risk and high-risk of dengue. Our forecasts for June, 2014, showed that dengue risk was likely to be low in the host cities Brasília, Cuiabá, Curitiba, Porto Alegre, and São Paulo. The risk was medium in Rio de Janeiro, Belo Horizonte, Salvador, and Manaus. High-risk alerts were triggered for the northeastern cities of Recife (p(high)=19%), Fortaleza (p(high)=46%), and Natal (p(high)=48%). For these high-risk areas, particularly Natal, the forecasting system did well for previous years (in June, 2000-13). This timely dengue early warning permits the Ministry of Health and local authorities to implement appropriate, city-specific mitigation and control actions ahead of the World Cup. European Commission's Seventh Framework Research Programme projects DENFREE, EUPORIAS, and SPECS; Conselho Nacional de Desenvolvimento Científico e Tecnológico and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro.

20 October 2009 in Climatic Change
Verified
Journal Article
Closed access
PDF file
NDNicolas Degallier
Nicolas Degallier
CFCharly Favier
Charly Favier
CMchristophe menkes
christophe menkes
MLMatthieu Lengaigne
Matthieu Lengaigne
WRWalter Massa Ramalho
Walter Massa Ramalho
JBJean-Philippe Boulanger
Jean-Philippe Boulanger

MAMarco Angelo
Marco Angelo
WRWalter Massa Ramalho
Walter Massa Ramalho
HGHelen Gurgel
Helen Gurgel
NBNayara Belle
Nayara Belle
Eva PilotEva Pilot
Eva Pilot
Dengue’s increasing trends raise concerns over global health and pose a challenge to the Brazilian health system, highlighting the necessity of a strong surveillance system to reduce morbidity, mortality, and the economic burden of this disease. Although the Brazilian surveillance system reports more dengue cases than any other country, recent studies suggest that non-reported cases are the majority. The aim of the study is to explore the strengths and weaknesses of the Brazilian surveillance system, particularly looking at the functioning of data collection and reporting. This was done through qualitative semi-structured interviews with 17 experts in dengue surveillance, supported by quantitative data from the official notification system. To select the interviewees, purposive and theoretical sampling were used. Data were analyzed through thematic analysis. The research highlighted that a lack of human and technological resources in healthcare units and surveillance departments slows down the notification process and data analysis. Due to a lack of integration in the private sector, the surveillance system fails to detect the socioeconomic profile of the patients. Investments in public healthcare, human and technological resources for surveillance and better integration in the private healthcare system, and vector surveillance may improve dengue surveillance.

1 February 2015 in Cadernos de Saude Publica
Verified
Journal Article
Open access
PDF file
IGIndianara Maria Grando
Indianara Maria Grando
CMCamile de Moraes
Camile de Moraes
BFBrendan Flannery
Brendan Flannery
WRWalter Massa Ramalho
Walter Massa Ramalho
MHMarco Aurélio P. Horta
Marco Aurélio P. Horta
GNGilmara Lima Nascimento
Gilmara Lima Nascimento
The objective of this study was to analyze the impact of vaccination against Streptococcus pneumoniae on the morbidity and mortality from pneumococcal meningitis in children ≤ 2 years in Brazil, from 2007 to 2012. This is a descriptive study and ecological analysis using data from the Information System on Notifiable Diseases. Pre-vaccination (2007-2009) and post-vaccination (2011-2012) periods were defined to compare incidence rates and mortality. A total of 1,311 cases and 430 deaths were reported during the study period. Incidence decreased from 3.70/100,000 in 2007 to 1.84/100,000 in 2012, and mortality decreased from 1.30/100,000 to 0.40/100,000, or 50% and 69% respectively, with the greatest impact in the 6-11 month age group. This decrease in Pneumococcal meningitis morbidity and mortality rates two years after introduction of the 10-valent pneumococcal conjugate vaccine suggests its effectiveness.

1 March 2016 in Ciencia & Saude Coletiva
Verified
Journal Article
Open access
PDF file
ASAderita Sena
Aderita Sena
CFCarlos Machado de Freitas
Carlos Machado de Freitas
CBChristovam Barcellos
Christovam Barcellos
WRWalter Massa Ramalho
Walter Massa Ramalho
CCCarlos Corvalan
Carlos Corvalan
Brazil, together with all the member countries of the United Nations, is in a process of adoption of a group of Sustainable Development Goals, including targets and indicators. This article considers the implications of these goals and their proposed targets, for the Semi-Arid region of Brazil. This region has recurring droughts which may worsen with climate change, further weakening the situation of access of water for human consumption in sufficient quantity and quality, and as a result, the health conditions of the exposed populations. This study identifies the relationship between drought and health, in an effort to measure progress in this region (1,135 municipalities), comparing relevant indicators with the other 4,430 municipalities in Brazil, based on census data from 1991, 2000 and 2010. Important inequalities between the municipalities of this region and the municipalities of the rest of Brazil are identified, and discussed in the context of what is necessary for achieving the Sustainable Development Goals in the Semi-arid Region, principally in relation to the measures for adaptation to achieve universal and equitable access to drinking water.