Publications by authors named "Marcio N Boia"

Objectives: to assess Popular Health Education practices on intestinal parasites, carried out by telephone contact with men living in urban communities in Rio de Janeiro, Brazil, during the COVID-19 syndemic.

Method: a quasi-experimental, quantitative and descriptive study, carried out with men aged 20 to 59 years. Pre-test was applied, and participants were divided into two groups: control and experimental.

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Article Synopsis
  • Intestinal parasitic infections (IPIs) are prevalent neglected diseases linked to poor socio-environmental conditions, leading to significant health issues among vulnerable populations, particularly in slums.
  • A study conducted in Rio de Janeiro analyzed 624 men aged 20-59 years, revealing a 23.8% prevalence of IPIs, with poor water quality affecting 40% of households.
  • Results indicate a need for targeted health education to improve awareness and self-care regarding IPIs, highlighting the importance of integrating these practices into Primary Health Care for men in urban slum areas.
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Human infections with gut protozoan parasites are neglected and not targeted by specific control initiatives, leading to a knowledge gap concerning their regional diversity and epidemiology. The present study aims to explore Giardia duodenalis genetic diversity and assess the epidemiologic scenario of subclinical infections in different Brazilian biogeographic regions. Cross-sectional surveys (n = 1334 subjects) were conducted in four municipalities in order to obtain fecal samples and socioenvironmental data.

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Metastrongylosis is an infection of the respiratory tract of pigs caused by parasites of the genus , whose eggs are similar to other through light microscopy; species-specific identification can be performed with molecular tools. We explored the species composition and the genetic diversity of infecting pigs in close contact with humans in impoverished rural communities in the state of Piauí, in northeastern Brazil. Fecal samples ( = 78) were collected for parasitologic tests.

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Helminths of the genus Oesophagostomum cause enteric diseases and affect domestic animals such as pigs. The aim of this study was to explore the species composition and genetic diversity of Oesophagostomum spp. infecting pigs in close contact with humans in the state of Piauí, Brazil.

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Subsistence hunting is the main source of protein for forest reserve dwellers, contributing to the development of spurious infections by Calodium hepaticum, frequently associated with the consumption of the liver from wild mammals. The prevalence of infections by soil-transmitted helminths (STHs) and intestinal protozoa is considered an indicator of the social vulnerability of a country, besides providing information on habits, customs and quality of life of a given population. Intestinal parasites mostly affect poor rural communities with limited access to clean water and adequate sanitation.

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Background: This study assessed the interactions between income, nutritional status and intestinal parasitism in children in Brazil.

Methods: A cross-sectional study (n = 421 children aged 1 to 14 years living in the states of Piauí (rural communities in the city of Teresina) and Rio de Janeiro (rural and periurban communities in the city of Cachoeiras de Macacu) was performed in order to obtain income and anthropometric data, as well as fecal samples for parasitological analyses through the Ritchie technique.

Results: Children infected with Ascaris lumbricoides had significantly lower means of height-for-age z scores (- 1.

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Background: COVID-19 is characterized by a rapid change in the patient's condition, with major changes occurring over a few days. We aimed to develop and evaluate an emergency system for monitoring patients with COVID-19, which may be useful in hospitals where more severe patients stay in their homes.

Methodology/principal Findings: The system consists of the home-based patient unit, which is set up around the patient and the hospital unit, which enables the medical staff to telemonitor the patient's condition and help to send medical recommendations.

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  • The study investigates the diversity, relationships, and distribution of Entamoeba species, which impact human health, across various Brazilian ecosystems.
  • Researchers collected and analyzed fecal samples from multiple communities, identifying four species and establishing their prevalence, particularly noting higher positivity in children aged 6-10 years.
  • Findings reveal significant interspecific diversity among Entamoeba spp., with specific subtypes prevalent in certain biomes, and highlight that E. histolytica was only found in the Amazon.
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Soil-transmitted helminthiasis (STHs) are poverty-related diseases with high prevalence rates in developing countries. The present study aims to describe the epidemiological scenario of STHs in an urban population in the Brazilian Amazon. A cross-sectional survey ( = 349 children aged 1-15 years) was carried out to obtain faecal samples and sociodemographic and sanitation data.

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Background: Chagas disease (CD) remains an important endemic disease in Latin America. However, CD became globalized in recent decades. The majority of the chronically infected individuals did not receive etiologic treatment for several reasons, among them the most conspicuous is the lack of access to diagnosis.

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This study aims to assess the prevalence, distribution, and etiological profile of intestinal parasitism in children living in periurban areas in Cachoeiras de Macacu, Rio de Janeiro, Brazil. A community-based cross-sectional survey ( = 479) was carried out. Prevalence of infection with and / was 8.

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In this study, we assessed the genetic diversity of Ascaris lumbricoides / Ascaris suum circulating in humans and pigs, exploring potential zoonotic cycles in endemic areas in Brazil. We carried out cross-sectional surveys in four municipalities: Santa Isabel do Rio Negro (SIRN-AM) (n = 328); Nossa Senhora de Nazaré (NSN-PI) and Teresina (TER-PI) (n = 605 and n = 297, respectively); and Cachoeiras de Macacu (CAM-RJ) (n = 543). We also studied 61 fecal samples/adult worms obtained from pigs (n = 53 in NSN-PI and n = 8 in TER-PI).

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HTLV-1/2 are transmitted sexually, by whole cell blood products and from mother-to-child (MTC), mainly through breastfeeding. HTLV-1/2 prevalence in pregnant women is high in Rio de Janeiro, however there were no local studies addressing the rate of adverse pregnancy outcomes (APO) and MTC transmission. The aim was to study sociodemographic characteristics which may be associated to HTLV-1/2 infection and describe pregnancy outcomes and MTC transmission in HTLV-1/2-positive women.

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Chagas disease is one of the most significant systemic parasitosis in Latin America, caused by , which is mainly transmitted by hematophagous insects, the triatomines. This research was carried out in both domestic and wild environments throughout a Northeastern rural locality. Triatomines were captured in both peridomicile and wild environments, obtaining 508 specimens of triatomines, of which 99.

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Article Synopsis
  • Hookworm infection remains a significant issue in rural Brazil, prompting researchers to study the genetic diversity and species composition of hookworms affecting humans through mitochondrial DNA analysis.
  • Field studies were conducted across three municipalities in Brazil from 2013 to 2017, with paralyzed methods used on fecal samples to identify various hookworm clades and genetic relationships, revealing notable diversity among the species.
  • Findings indicate that there are distinct subpopulations of Necator americanus and related hookworms, with genetic ties to both Asian and African origins, suggesting a complex evolutionary history and implications for future research in this area.
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This study aims to describe the prevalence, distribution, and factors associated with soil-transmitted helminthiases (STHs) in rural localities in Piaui, Brazil. Two cross-sectional surveys (n=605 subjects; 172 families) were carried out in order to obtain socio-demographic, anthropometric, spatial and parasitological data. Parasites were evaluated using Kato-Katz and centrifugal sedimentation techniques.

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Article Synopsis
  • - The study investigates the genetic diversity of Giardia duodenalis across different Brazilian biomes to understand its transmission and help develop control measures.
  • - Researchers conducted surveys in three locations (Caatinga, Amazon rainforest, and Cerrado) with 944 participants, revealing distinct rates of the two main genetic groups (assemblages A and B) and their prevalence in each biome.
  • - The findings highlight a greater genetic diversity of assemblage B in the Amazon, suggesting its complex transmission due to demographic factors, and propose that the significant genetic differences between assemblages A and B may warrant their classification as separate species.
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Introduction: The present study aimed to determine the prevalence and factors associated with Giardia intestinalis infection, verifying its impact on the nutritional status of children in northeastern Brazil.

Methodology: A cross-sectional study was conducted to obtain parasitological, sociodemographic, and anthropometric data in two municipalities in the states of Piauí and Ceará, northeastern Brazil.

Results: Prevalence of giardiasis was 55/511 (10.

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Background: Current control policies for intestinal parasitosis focuses on soil-transmitted helminths, being ineffective against Giardia intestinalis, a highly prevalent protozoon that impacts children's nutritional status in developing countries. The objective of this study was to explore spatial and molecular epidemiology of Giardia intestinalis in children of Amerindian descent in the Brazilian Amazon.

Methodology/principal Findings: A cross sectional survey was performed in the Brazilian Amazon with 433 children aged 1 to 14 years.

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Introduction: Few studies have described the risk factors of intestinal parasitic infections in the Amazon.

Methods: A cross-sectional survey was performed in a City of the State of Amazonas (Brazil) to estimate the prevalence of intestinal parasites and determine the risk factors for helminth infections.

Results: Ascaris lumbricoides was the most prevalent parasite.

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  • The study investigated the occurrence and characteristics of various Entamoeba infections, including E. histolytica and E. dispar, among 213 subjects using fecal sample analysis and PCR methods.
  • The overall prevalence of infection was found to be 10.3%, with higher rates in individuals consuming rainwater and those practicing open defecation.
  • The research highlighted that most identified infections were asymptomatic, pointing to significant sanitary issues in the region that facilitate transmission of these parasites.
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Introduction: Strongyloides stercoralis is a soil-transmitted helminth that produces an infection that can persist for decades. The relationships between certain clinical conditions and strongyloidiasis remains controversial. This study aims to identify the clinical conditions associated with intestinal strongyloidiasis at a reference center for infectious diseases in Rio de Janeiro, Brazil.

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Background: After the control of the main modes of Chagas disease (CD) transmission in most endemic countries, it is important to identify the participation of native sylvatic vectors in CD transmission. Although CD is not considered endemic in Rio de Janeiro State (RJ), Brazil, we identified patients with CD born in RJ and investigated the possible autochthonous transmission in the state.

Methods: Patients born in RJ and followed in our institution between 1986 and 2011 were retrospectively analyzed.

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Background: HTLV-1/2 infection can cause severe and disabling diseases in children and adults. The aim of the study was to estimate the prevalence of HTLV-1/2 infection in pregnant women living in the metropolitan area of Rio de Janeiro.

Methodology/principal Findings: 1,204 pregnant women were tested upon hospital admission for delivery in two public hospitals in the cities of Rio de Janeiro and Mesquita, between November, 2012 and April, 2013.

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