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1.
J Pediatr ; 269: 114001, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38432296

RESUMO

OBJECTIVE: To assess the relative risk of mortality in infants born preterm and small for gestational age (SGA) during the first and second months of life in rural Bangladesh. STUDY DESIGN: We analyzed data from a cohort of pregnant women and their babies in Sylhet, Bangladesh, assembled between 2011 and 2014. Community health workers visited enrolled babies up to 10 times from birth to age 59 days. Survival status was recorded at each visit. Gestational age was estimated from mother's reported last menstrual period. Birth weights were measured within 72 hours of delivery. SGA was defined using the INTERGROWTH-21st standard. We estimated unadjusted and adjusted hazard ratios (HRs) and corresponding 95% CIs for babies born preterm and SGA separately for the first and second month of life using bivariate and multivariable weighted Cox regression models. RESULTS: The analysis included 17 643 singleton live birth babies. Compared with infants born at term-appropriate for gestational age, in both unadjusted and adjusted analyses, infants born preterm-SGA had the greatest risk of death in the first (HR 13.25, 95% CI 8.65-20.31; adjusted HR 12.05, 95% CI 7.82-18.57) and second month of life (HR 4.65, 95% CI 1.93-11.23; adjusted HR 4.1, 95% CI 1.66-10.15), followed by infants born preterm-appropriate for gestational age and term-SGA. CONCLUSIONS: The risk of mortality in infants born preterm and/or SGA is increased and extends through the second month of life. Appropriate interventions to prevent and manage complications caused by prematurity and SGA could improve survival during and beyond the neonatal period.


Assuntos
Mortalidade Infantil , Recém-Nascido Prematuro , Recém-Nascido Pequeno para a Idade Gestacional , População Rural , Humanos , Bangladesh/epidemiologia , Recém-Nascido , Feminino , Estudos Prospectivos , População Rural/estatística & dados numéricos , Masculino , Lactente , Adulto , Gravidez , Idade Gestacional , Nascimento Prematuro/epidemiologia , Adulto Jovem , Estudos de Coortes
2.
PLoS One ; 17(2): e0263091, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35130270

RESUMO

INTRODUCTION: Women experience high rates of depression, particularly during pregnancy and the postpartum periods. Using population-based data from Bangladesh and Pakistan, we estimated the burden of antenatal depression, its risk factors, and its effect on preterm birth. METHODS: The study uses the following data: maternal depression measured between 24 and 28 weeks of gestation using the 9-question Patient Health Questionnaire (PHQ-9); data on pregnancy including an ultrasound before 19 weeks of gestation; data on pregnancy outcomes; and data on woman's age, education, parity, weight, height, history of previous illness, prior miscarriage, stillbirth, husband's education, and household socioeconomic data collected during early pregnancy. Using PHQ-9 cutoff score of ≥12, women were categorized into none to mild depression or moderate to moderately severe depression. Using ultrasound data, preterm birth was defined as babies born <37 weeks of gestation. To identify risk ratios (RR) for antenatal depression, unadjusted and adjusted RR and 95% confidence intervals (CI) were calculated using log- binomial model. Log-binomial models were also used for determining the effect of antenatal depression on preterm birth adjusting for potential confounders. Data were analyzed using Stata version 16 (StataCorp LP). RESULTS: About 6% of the women reported moderate to moderately severe depressive symptoms during the antenatal period. A parity of ≥2 and the highest household wealth status were associated with an increased risk of depression. The overall incidence of preterm birth was 13.4%. Maternal antenatal depression was significantly associated with the risk of preterm birth (ARR, 95% CI: 1.34, 1.02-1.74). CONCLUSION: The increased risk of preterm birth in women with antenatal depression in conjunction with other significant risk factors suggests that depression likely occurs within a constellation of other risk factors. Thus, to effectively address the burden of preterm birth, programs require developing and providing integrated care addressing multiple risk factors.


Assuntos
Depressão/epidemiologia , Resultado da Gravidez/epidemiologia , Nascimento Prematuro/epidemiologia , Adulto , Ásia/epidemiologia , Bangladesh/epidemiologia , Estudos de Coortes , Depressão/complicações , Feminino , Humanos , Recém-Nascido , Paquistão/epidemiologia , Gravidez , Complicações na Gravidez/epidemiologia , Complicações na Gravidez/psicologia , Resultado da Gravidez/psicologia , Cuidado Pré-Natal/estatística & dados numéricos , Fatores de Risco , Adulto Jovem
3.
PLoS One ; 15(4): e0229988, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32320993

RESUMO

BACKGROUND: Neonatal infections remain a leading cause of newborn deaths globally. In 2015, WHO issued guidelines for managing possible serious bacterial infection (PSBI) in young infants (0-59 days) using simplified antibiotic regimens when compliance with hospital referral is not feasible. Bangladesh was one of the first countries to adopt WHO's guidelines for implementation. We report results of an implementation research study that assessed facility readiness and provider performance in three rural sub-districts of Bangladesh during August 2015-August 2016. METHODS: This study took place in 19 primary health centers. Facility readiness was assessed using checklists completed by study staff at three time points. To assess provider performance, we extracted data for all infection cases from facility registers and compared providers' diagnosis and treatment against the guidelines. We plotted classification and dosage errors across the study period and superimposed a locally weighted smoothed (LOWESS) curve to analyze changes in performance over time. Focus group discussions (N = 2) and in-depth interviews (N = 28) with providers were conducted to identify barriers and facilitators for facility readiness and provider performance. RESULTS: At baseline, none of the facilities had adequate supply of antibiotics. During the 10-month period, 606 sick infants with signs of infection presented at the study facilities. Classification errors were identified in 14.9% (N = 90/606) of records. For infants receiving the first dose(s) of antibiotic treatment (N = 551), dosage errors were identified in 22.9% (N = 126/551) of the records. Distribution of errors varied by facility (35.7% [IQR: 24.7-57.4%]) and infection severity. Errors were highest at the beginning of the study period and decreased over time. Qualitative data suggest errors in early implementation were due to changes in providers' assessment and treatment practices, including confusion about classifying an infant with multiple signs of infection, and some providers' concerns about the efficacy of simplified antibiotic regimens. CONCLUSIONS: Strategies to monitor early performance and targeted supports are important for enhancing implementation fidelity when introducing complex guidelines in new settings. Future research should examine providers' assessment of effectiveness of simplified treatment and address misconceptions about superiority of broader spectrum antibiotics for treating community-acquired neonatal infections in this context.


Assuntos
Antibacterianos/uso terapêutico , Infecções Bacterianas/tratamento farmacológico , Gerenciamento Clínico , Atenção Primária à Saúde , Instituições de Assistência Ambulatorial , Infecções Bacterianas/epidemiologia , Infecções Bacterianas/microbiologia , Bangladesh/epidemiologia , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Encaminhamento e Consulta , População Rural
4.
PLoS One ; 15(4): e0231490, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32287286

RESUMO

INTRODUCTION: Many infants with possible serious bacterial infections (PSBI) do not receive inpatient treatment because hospital care may not be affordable, accessible, or acceptable for families. In 2015, WHO issued guidelines for managing PSBI in young infants (0-59 days) with simpler antibiotic regimens when hospital care is not feasible. Bangladesh adopted WHO's guidelines for implementation in outpatient primary health centers. We report results of an implementation research study that assessed caregiver acceptability of the guidelines in three rural sub-districts of Bangladesh during early implementation (October 2015-August 2016). METHODS: We included 19 outpatient primary health centers involved in the initial rollout of the infection management guidelines. We extracted data for all PSBI cases (N = 192) from facility registers to identify gaps in referral feasibility, simplified antibiotic treatment, and follow-up. Focus group discussions (FGD) and in-depth interviews (IDI) were conducted with both caregivers (6 FGDs; 23 IDIs) and providers (2 FGDs; 28 IDIs) to assess caregiver acceptability of the guidelines. RESULTS: Referral to the hospital was not feasible for many families (83.3%; N = 160/192) and acceptance varied by infection severity. Barriers to referral feasibility included economic and household factors, and previous experiences with poor quality of care at the sub-district hospital. Conversely, providers and caregivers indicated high acceptability of simplified antibiotic treatment. 80% (N = 96/120) of infants with clinical severe infection for whom referral was not feasible returned to the facility for the second antibiotic injection. Some providers reported developing local solutions-including engaging informal providers in treatment of the infant-to address organizational barriers and promote treatment compliance. Follow-up of young infants receiving simplified treatment is critical, but only 67.4% (N = 87/129) of infants received fourth day follow-up. Some providers' reported deviations from the guidelines that shifted responsibility of follow-up to the caregiver, which may have contributed to lapses. CONCLUSION: Caregivers' perception of trust and communication with providers were influential in caregiver acceptability of care. Few caregivers accepted referral to the sub-district hospital, suggesting low acceptability of this option. When referral was not feasible, many caregivers reported satisfaction with simplified antibiotic treatment. Local solutions described by providers require further examination in this context to assess the safety and potential value of these strategies in outpatient treatment. Our findings suggest strengthening providers' interpersonal skills could improve caregiver acceptability of the guidelines.


Assuntos
Atitude Frente a Saúde/etnologia , Cuidadores/psicologia , Cooperação do Paciente/psicologia , Adulto , Assistência Ambulatorial/métodos , Assistência Ambulatorial/tendências , Instituições de Assistência Ambulatorial , Antibacterianos/uso terapêutico , Infecções Bacterianas/tratamento farmacológico , Infecções Bacterianas/terapia , Bangladesh/epidemiologia , Feminino , Humanos , Lactente , Masculino , Pessoa de Meia-Idade , Pacientes Ambulatoriais , Atenção Primária à Saúde , População Rural , Organização Mundial da Saúde
5.
J Health Popul Nutr ; 38(1): 41, 2019 12 06.
Artigo em Inglês | MEDLINE | ID: mdl-31810496

RESUMO

BACKGROUND: World Health Organization revised the global guidelines for management of possible serious bacterial infection (PSBI) in young infants to recommend the use of simplified antibiotic therapy in settings where access to hospital care is not possible. The Bangladesh Ministry of Health and Family Welfare (MoHFW), Government of Bangladesh (GOB) adopted these guidelines, allowing treatment at first-level facilities. During the first year of implementation, the Projahnmo Study Group and USAID/MaMoni Health Systems Strengthening (HSS) Project supported the MoHFW to operationalize the new guidelines and conducted an implementation research study in selected districts to assess challenges and identify solutions to facilitate scale-up across the country. IMPLEMENTATION SUPPORT: Projahnmo and MaMoni HSS teams supported implementation in three areas: building capacity, strengthening service delivery, and mobilizing communities. Capacity building focused on training paramedics to conduct outpatient management of PSBI cases and developing monitoring and supervision systems. The teams also filled gaps in government supply of essential drugs, equipment, and logistics. Community mobilization strategies to promote care-seeking and referrals to facilities varied across districts; in one district community, health workers made home visits while in another district, the promotion was carried out through community volunteers, village doctors, and through existing community structures. METHODS: We followed a plan-do-study-act (PDSA) cycle to identify and address implementation challenges. Three cycles-1 every 4 months-were conducted. We collected data utilizing quantitative and qualitative methods in both the community and facilities. The total sample size for this study was 13,590. DISCUSSION: This article provides implementation research design details for program managers intending to implement new guidelines on management of young infant infections. Results of this research will be reported in the forthcoming papers. Preliminary findings indicate that the management of PSBI cases at the UH&FWCs is feasible. However, MoHFW, GOB needs to address the implementation challenges before scale-up of this policy to the national level.


Assuntos
Infecções Bacterianas/terapia , Fortalecimento Institucional/métodos , Programas Governamentais/métodos , Implementação de Plano de Saúde/métodos , Ciência da Implementação , Antibacterianos/normas , Bangladesh , Feminino , Humanos , Lactente , Bem-Estar do Lactente , Recém-Nascido , Masculino , Projetos de Pesquisa , Serviços de Saúde Rural/normas , População Rural
6.
BMJ Glob Health ; 4(6): e001643, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31803507

RESUMO

Neonatal infections remain a leading cause of newborn deaths globally. In 2015, WHO issued guidelines for managing possible serious bacterial infection (PSBI) in young infants (0-59 days) with simpler antibiotic regimens if hospital referral is not feasible. Bangladesh was one of the first countries to adapt WHO guidance into national guidelines for implementation in primary healthcare facilities. Early implementation was led by the Ministry of Health and Family Welfare (MOHFW) in 10 subdistricts of Bangladesh with support from USAID's MaMoni Health System Strengthening project. This mixed methods implementation research case study explores programme feasibility and acceptability through analysis of service delivery data from 4590 sick young infants over a 15-month period, qualitative interviews with providers and MOHFW managers and documentation by project staff. Multistakeholder collaboration was key to ensuring facility readiness and feasibility of programme delivery. For the 514 (11%) infants classified as PSBI, provider adherence to prereferral treatment and follow-up varied across infection subcategories. Many clinical severe infection cases for whom referral was not feasible received the recommended two doses of injectable gentamicin and follow-up, suggesting delivery of simplified antibiotic treatment is feasible. However, prereferral antibiotic treatment was low for infants whose families accepted hospital referral, which highlights the need for additional focus on managing these cases in training and supervision. Systems for tracking sick infants that accept hospital referral are needed, and follow-up of all PSBI cases requires strengthening to ensure sick infants receive the recommended treatment, to monitor outcomes and assess the effectiveness of the programme. Only 11.2% (95% CI 10.3 to 12.1) of the expected PSBI cases sought care from the selected service delivery points in the programme period. However, increasing trends in utilisation suggest improved awareness and acceptability of services among families of young infants as the programme matured. Future programme activities should include interviews with caregivers to explore the complexities around referral feasibility and acceptability of simplified antibiotic treatment.

7.
Pediatr Infect Dis J ; 35(5 Suppl 1): S55-9, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-27070066

RESUMO

BACKGROUND: Despite the high rate of deaths in young infants (0-59 days) attributable to infections in resource-poor countries, data on bacterial and viral etiologies of community-acquired infections in this age group are limited. These data are needed to develop appropriate preventive strategies and suitable antibiotic treatment regimens for reducing the number of young infant deaths from infections. The Aetiology of Neonatal Infection in South Asia (ANISA) study is designed to generate these critical data and is being implemented in Bangladesh, India and Pakistan. The Sylhet site in Bangladesh was selected because neonatal mortality is high in this country and particularly in Sylhet District. In this article, we describe the contextual challenges in implementing the ANISA study in Sylhet, as well as the strategies developed by our team to address these challenges. CONTEXTUAL CHALLENGES: The major challenge in implementing the ANISA protocol in Sylhet is conducting the first postnatal visit within 24 hours of birth. This problem stems from several social, cultural and geographical characteristics of the study population and its demographic profile. In this area, most births take place at home, referral compliance for newborn illness to health facilities is low and the blood culture contamination rate is high. Community mobilization, cellphone-based birth notification by families, delivery of quality services at study hospitals and referral support to families in need were some of the strategies adopted by the Sylhet site team for overcoming these challenges during study implementation. Quality control in specimen collection, transportation and processing also plays a role in ensuring satisfactory performance. CONCLUSION: Our research team, with support from the ANISA coordination center, has successfully addressed these challenges and is implementing the study protocol while maintaining the high quality benchmark set by the coordination center.


Assuntos
Coleta de Dados , Monitoramento Epidemiológico , Sepse Neonatal/etiologia , Manejo de Espécimes , Bangladesh/epidemiologia , Humanos , Incidência , Lactente , Recém-Nascido , Sepse Neonatal/epidemiologia , Fatores de Risco
8.
Hum Resour Health ; 13: 19, 2015 Apr 09.
Artigo em Inglês | MEDLINE | ID: mdl-25880459

RESUMO

BACKGROUND: Supervision is meant to improve the performance and motivation of community health workers (CHWs). However, most evidence on supervision relates to facility health workers. The Integrated Maternal, Newborn, and Child Health (MNCH) Program in Morogoro region, Tanzania, implemented a CHW pilot with a cascade supervision model where facility health workers were trained in supportive supervision for volunteer CHWs, supported by regional and district staff, and with village leaders to further support CHWs. We examine the initial experiences of CHWs, their supervisors, and village leaders to understand the strengths and challenges of such a supervision model for CHWs. METHODS: Quantitative and qualitative data were collected concurrently from CHWs, supervisors, and village leaders. A survey was administered to 228 (96%) of the CHWs in the Integrated MNCH Program and semi-structured interviews were conducted with 15 CHWs, 8 supervisors, and 15 village leaders purposefully sampled to represent different actor perspectives from health centre catchment villages in Morogoro region. Descriptive statistics analysed the frequency and content of CHW supervision, while thematic content analysis explored CHW, supervisor, and village leader experiences with CHW supervision. RESULTS: CHWs meet with their facility-based supervisors an average of 1.2 times per month. CHWs value supervision and appreciate the sense of legitimacy that arises when supervisors visit them in their village. Village leaders and district staff are engaged and committed to supporting CHWs. Despite these successes, facility-based supervisors visit CHWs in their village an average of only once every 2.8 months, CHWs and supervisors still see supervision primarily as an opportunity to check reports, and meetings with district staff are infrequent and not well scheduled. CONCLUSIONS: Supervision of CHWs could be strengthened by streamlining supervision protocols to focus less on report checking and more on problem solving and skills development. Facility health workers, while important for technical oversight, may not be the best mentors for certain tasks such as community relationship-building. We suggest further exploring CHW supervision innovations, such as an enhanced role for community actors, who may be more suitable to support CHWs engaged primarily in health promotion than scarce and over-worked facility health workers.


Assuntos
Agentes Comunitários de Saúde , Serviços de Saúde Materno-Infantil , Gestão de Recursos Humanos , Atitude do Pessoal de Saúde , Criança , Saúde da Criança , Feminino , Instalações de Saúde , Humanos , Saúde do Lactente , Recém-Nascido , Saúde Materna , Gravidez , Características de Residência , Tanzânia , Voluntários
9.
BMC Pediatr ; 14: 112, 2014 Apr 24.
Artigo em Inglês | MEDLINE | ID: mdl-24758701

RESUMO

BACKGROUND: Globally, about 15 million neonates are born preterm and about 85% of global preterm birth occurs in Asia and Africa regions. We aimed to estimate the incidence and risk factors for preterm birth in a rural Bangladeshi cohort. METHODS: Between June 2007 and September 2009, community health workers prospectively collected data from 32,126 mother-live-born baby pairs on household socio-demographic status, pregnancy history, antenatal care seeking and newborn gestational age determined by recall of date of last menstrual period. RESULTS: Among all live births, 22.3% were delivered prior to 37 weeks of gestation (i.e. preterm); of which 12.3% were born at 35-36 weeks of gestation (late preterm), 7.1% were born at 32-34 weeks (moderate preterm), and 2.9% were born at 28-31 weeks of gestation (very preterm). Overall, the majority of preterm births (55.1%) were late preterm. Risk of preterm birth was lower among women with primary or higher level of education (RR: 0.92; 95% CI: 0.88, 0.97), women who sought antenatal care at least once during the index pregnancy (RR: 0.86; 95% CI: 0.83, 0.90), and women who had completed all birth preparedness steps (RR: 0.32; 95% CI: 0.30, 0.34). In contrast, risk of preterm birth was higher among women with a history of child death (RR: 1.05; 95% CI: 1.01, 1.10), who had mid-upper arm circumference (MUAC) ≤250 mm, indicative of under nutrition (for women having MUAC <214 mm the risk was higher; RR: 1.26; 95% CI: 1.17, 1.35), who reported an antenatal complication (RR: 1.32; 95% CI: 1.14, 1.53), and who received iron-folic acid supplementation for 2-6 months during the index pregnancy (RR: 1.33; 95% CI: 1.24, 1.44). CONCLUSIONS: In resource poor settings with high burden of preterm birth, alike Bangladesh, preterm birth risk could be reduced by close monitoring and/or frequent follow-up of women with history of child death and antenatal complications, by encouraging women to seek antenatal care from qualified providers, to adopt birth preparedness planning and to maintain good nutritional status. Additional research is needed to further explore the associations of antenatal iron supplementation and maternal nutritional status on preterm birth.


Assuntos
Nascimento Prematuro/epidemiologia , Aborto Espontâneo/epidemiologia , Adulto , Bangladesh/epidemiologia , Suplementos Nutricionais , Escolaridade , Feminino , Ácido Fólico/administração & dosagem , Idade Gestacional , Humanos , Incidência , Recém-Nascido , Ferro/administração & dosagem , Desnutrição/epidemiologia , Gravidez , Complicações na Gravidez/epidemiologia , Gravidez Múltipla/estatística & dados numéricos , Cuidado Pré-Natal/estatística & dados numéricos , Estudos Prospectivos , Fatores de Risco , População Rural , Oligoelementos/administração & dosagem , Complexo Vitamínico B/administração & dosagem , Adulto Jovem
10.
BMC Public Health ; 13 Suppl 3: S16, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24564646

RESUMO

BACKGROUND: Oral rehydration salts (ORS), zinc, and continued feeding are the recommended treatments for community-acquired acute diarrhea among young children. However, probiotics are becoming increasingly popular treatments for diarrhea in some countries. We sought to estimate the effect of probiotics on diarrhea morbidity and mortality in children < 5 years of age. METHODS: We conducted a systematic review of randomized controlled trials to estimate the effect of probiotic microorganisms for the treatment of community-acquired acute diarrhea in children. Data were abstracted into a standardized table and study quality was assessed using the Child Health Epidemiology Reference Group (CHERG) adaption of the GRADE technique. We measured the relative effect of probiotic treatment in addition to recommended rehydration on hospitalizations, duration and severity. We then calculated the average percent difference for all continuous outcomes and performed a meta-analysis for discrete outcomes. RESULTS: We identified 8 studies for inclusion in the final database. No studies reported diarrhea mortality and overall the evidence was low to moderate quality. Probiotics reduced diarrhea duration by 14.0% (95% CI: 3.8-24.2%) and stool frequency on the second day of treatment by 13.1% (95% CI: 0.8 - 25.3%). There was no effect on the risk of diarrhea hospitalizations. CONCLUSION: Probiotics may be efficacious in reducing diarrhea duration and stool frequency during a diarrhea episode. However, only few studies have been conducted in low-income countries and none used zinc (the current recommendation) thus additional research is needed to understand the effect of probiotics as adjunct therapy for diarrhea among children in developing countries.


Assuntos
Infecções Comunitárias Adquiridas/tratamento farmacológico , Países em Desenvolvimento , Diarreia/tratamento farmacológico , Probióticos/uso terapêutico , Doença Aguda , Criança , Pré-Escolar , Terapia Combinada , Infecções Comunitárias Adquiridas/mortalidade , Diarreia/mortalidade , Feminino , Hidratação/métodos , Humanos , Lactente , Masculino , Pobreza , Soluções para Reidratação/uso terapêutico , Oligoelementos/uso terapêutico , Zinco/uso terapêutico
11.
J Health Popul Nutr ; 30(3): 257-61, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23082627

RESUMO

Haemolytic-uraemic syndrome (HUS) is a serious sequela of diarrhoea and results in a high mortality rate. This systematic review aimed at estimating the proportion of HUS cases that are linked to prior infection due to Shiga toxin-producing Escherichia coli (STEC) or Shigella dysenteriae type 1. A systematic review of the existing literature was done to identify cohort and case-control studies that examined the relationship between STEC and S. dysenteriae type 1 and HUS. After screening 2,516 articles, 11 studies were found that met the inclusion/exclusion criteria. Findings of case-control studies suggest that 60.8% of the HUS cases may be attributable to a previous infection with STEC. In cohort studies, 7.8% of participants with STEC and 8% of participants with S. dysenteriae type 1 developed HUS during follow-up. HUS is linked to diarrhoea due to both STEC and S. dysenteriae type 1. Thus, preventing infections caused by both pathogens is critical for the prevention and control of HUS, especially in areas where timely and effective treatment is not available.


Assuntos
Diarreia/complicações , Síndrome Hemolítico-Urêmica/complicações , Estudos de Casos e Controles , Estudos de Coortes , Diarreia/microbiologia , Diarreia/fisiopatologia , Disenteria/complicações , Disenteria/microbiologia , Disenteria/fisiopatologia , Saúde Global , Síndrome Hemolítico-Urêmica/etiologia , Humanos , Escherichia coli Shiga Toxigênica/isolamento & purificação , Shigella dysenteriae/isolamento & purificação
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