SummaryBackgroundA city-wide sanitation intervention was started in Salvador, Brazil, in 1997 to improve sewerage coverage from 26% of households to 80%. Our aim was to investigate the epidemiological effect of this city-wide sanitation programme on diarrhoea morbidity in children less than 3 years of age.MethodsThe investigation was composed of two longitudinal studies done in 1997–98 before the intervention (the sanitation programme) and in 2003–04 after the intervention had been completed. Each study consisted of a cohort of children (841 in the preintervention study and 1007 in the postintervention study; age 0–36 months at baseline) who were followed up for a maximum of 8 months. Children were sampled from 24 sentinel areas that were randomly chosen to represent the range of environmental conditions in the study site. At the start of each study an individual or household questionnaire was applied by trained fieldworkers; an environmental survey was done in each area before and after introduction of the sanitation programme to assess basic neighbourhood and household sanitation conditions. Daily diarrhoea data were obtained during home visits twice per week. The effect of the intervention was estimated by a hierarchical modelling approach fitting a sequence of multivariate regression models.FindingsDiarrhoea prevalence fell by 21% (95% CI 18–25%)—from 9·2 (9·0–9·5) days per child-year before the intervention to 7·3 (7·0–7·5) days per child-year afterwards. After adjustment for baseline sewerage coverage and potential confounding variables, we estimated an overall prevalence reduction of 22% (19–26%).InterpretationOur results show that urban sanitation is a highly effective health measure that can no longer be ignored, and they provide a timely support for the launch of 2008 as the International Year of Sanitation.

BackgroundSanitation affects health, especially that of young children. Residents of Salvador, in Northeast Brazil, have had a high prevalence of intestinal parasites. A citywide sanitation intervention started in 1996 aimed to raise the level of sewer coverage from 26% to 80% of households.ObjectivesWe evaluated the impact of this intervention on the prevalence of Ascaris lumbricoides, Trichuris trichuria, and Giardia duodenalis infections in preschool children.MethodsThe evaluation was composed of two cross-sectional studies (1998 and 2003–2004), each of a sample of 681 and 976 children 1–4 years of age, respectively. Children were sampled from 24 sentinel areas chosen to represent the range of environmental conditions in the study site. Data were collected using an individual/household questionnaire, and an environmental survey was conducted in each area before and after the intervention to assess basic household and neighborhood sanitation conditions. Stool samples were examined for the presence of intestinal parasites. The effect of the intervention was estimated by hierarchical modeling, fitting a sequence of multivariate regression models.FindingsThe prevalence of A. lumbricoides infection was reduced from 24.4% to 12.0%, T. trichuria from 18.0% to 5.0%, and G. duodenalis from 14.1% to 5.3%. Most of this reduction appeared to be explained by the increased coverage in each neighborhood by the sewage system constructed during the intervention. The key explanatory variable was thus an ecological measure of exposure and not household-based, suggesting that the parasite transmission prevented by the program was mainly in the public (vs. the domestic) domain.ConclusionThis study, using advanced statistical modeling to control for individual and ecological potential confounders, demonstrates the impact on intestinal parasites of sanitation improvements implemented at the scale of a large population.

BackgroundStudies conducted in transitional communities from Africa and Asia have pointed to the process of urbanisation as being responsible for the increase in asthma prevalence in developing regions. In Latin America, there are few published data available on the potential impact of urbanisation on asthma prevalence. The aim of the present study was to explore how the process of urbanisation may explain differences in asthma prevalence in transitional communities in north-eastern Ecuador.Methodology/principal findingsAn ecological study was conducted in 59 communities in Esmeraldas Province, Ecuador. Indicators of urbanisation were grouped into three indices representing the processes associated with urbanisation: socioeconomic, lifestyle and urban infrastructure. Categorical principal components analysis was used to generate scores for each index and a fourth index—a summary urbanisation index—was derived from the most representative variables in each of the three indices. The authors analysed the associations between community asthma prevalence and the indices, as well as with each indicator variable of every group. The overall prevalence of asthma was 10.1% (range 0–31.4% between communities). Three of the four indices presented significant associations with community asthma prevalence: socioeconomic (r=0.295, p=0.023), lifestyle (r=0.342, p=0.008) and summary urbanisation index (r=0.355, p=0.006). Variables reflecting better socioeconomic status and a more urban lifestyle were associated with greater asthma prevalence.ConclusionsThese data provide evidence that the prevalence of asthma increases with increasing levels of urbanisation in transitional communities, and factors associated with greater socioeconomic level and changes towards a more urban lifestyle may be particularly important.

Admissions due to primary health care sensitive conditions from 1999 to 2009 among children < 5 years old were analyzed for municipalities in Pernambuco State, Brazil. Using data from the Brazilian Unified National Health System's Hospital Information System, a negative binomial regression was applied to estimate rate ratio (RR) and 95%CI for the effect on primary health care sensitive condition rates (admissions/10,000 inhabitants) of the Family Health Program (FHP) coverage (%), some demographic variables and living conditions. Hospitalizations due to primary health care sensitive conditions represented 44.1% of 861,628 admissions and the rate declined from 557.6 to 318.9 (-42.8%), a reduction three times greater than the rate due to all other causes. Increased FHP coverage was protective against primary health care sensitive conditions (RR = 0.94; 95%CI: 0.89-0.99). A decline in hospitalizations due to primary health care sensitive conditions indicated improvements in health status and may be associated with the consolidation of primary health care. Studies on access and quality of primary health care in relation to child morbidity and hospitalizations are needed.

The intervention reduced diarrhoea risk by reducing direct exposure to unfavourable sanitation conditions. At the same time it altered the effect and mediation pathways of most distal diarrhoea determinants, especially SES. This finding corroborates the importance of public sanitation measures in reducing the impact of poverty on diarrhoea. It also underlines the value of studying the impact of public health interventions to improve our understanding of health determinants.

No abstract

IMPORTANCE Despite progress toward reducing global incidence, leprosy control remains a challenge in low-and middle-income countries. OBJECTIVE To estimate new case detection rates of leprosy among household contacts of patients with previously diagnosed leprosy and to investigate its associated risk factors. DESIGN, SETTING, AND PARTICIPANTS This population-based cohort study included families registered in the 100 Million Brazilian Cohort linked with nationwide registries of leprosy; data were collected from January 1, 2007, through December 31, 2014. Household contacts of patients with a previous diagnosis of leprosy from each household unit were followed up from the time of detection of the primary case to the time of detection of a subsequent case or until December 31, 2014. Data analysis was performed from May to December 2018. EXPOSURES Clinical characteristics of the primary case and sociodemographic factors of the household contact. MAIN OUTCOMES AND MEASURES Incidence of leprosy, estimated as the new case detection rate of leprosy per 100 000 household contacts at risk (person-years at risk). The association between occurrence of a subsequent leprosy case and the exposure risk factors was assessed using multilevel mixed-effects logistic regressions allowing for state-and household-specific random effects. RESULTS Among 42 725 household contacts (22 449 [52.5%] female; mean [SD] age, 22.4 [18.5] years) of 17 876 patients detected with leprosy, the new case detection rate of leprosy was 636.3 (95% CI, 594.4-681.1) per 100 000 person-years at risk overall and 521.9 (95% CI, 466.3-584.1) per 100 000 person-years at risk among children younger than 15 years. Household contacts of patients with multibacillary leprosy had higher odds of developing leprosy (adjusted odds ratio [OR] , 1.48; 95% CI, 1.17-1.88), and the odds increased among contacts aged 50 years or older (adjusted OR, 3.11; 95% CI, 2.03-4.76). Leprosy detection was negatively associated with illiterate or preschool educational level (adjusted OR, 0.59; 95% CI, 0.38-0.92). For children, the odds were increased among boys (adjusted OR, 1.70; 95% CI, 1.20-2.42). CONCLUSIONS AND RELEVANCE The findings in this Brazilian population-based cohort study suggest that the household contacts of patients with leprosy may have increased risk of leprosy, especially in households with existing multibacillary cases and older contacts. Public health interventions, such as contact screening, that specifically target this population appear to be needed.

Estudo transversal com 3.817 pré-escolares, 1.770 residentes em Salvador, Bahia, Brasil, e 2.047 nas áreas urbana e rural de 10 municípios baianos. Utilizou-se recordatório de 24 horas (R24h) e empregou-se análise fatorial por componentes principais com objetivo de identificar e comparar os principais padrões alimentares dessas crianças. Estratificou-se a amostra por idade e área. Antes dos seis meses de vida o leite materno compôs o 2o e 3o padrões com carga positiva para crianças dos dez municípios. Para menores de 17 meses, o padrão 1 foi caracterizado por leite de vaca, farinhas e açúcares. Em áreas urbanas, pão/biscoito, arroz, feijão e carne integraram o padrão 2 aos 6-17 meses. Aos 18-23 meses, o padrão 1 apresentou carga negativa para açúcares, leite de vaca e farinhas, exceto na área rural. Frutas não fizeram parte do padrão 1 no grupo de 24 meses e mais. Observou-se baixo consumo de leite materno e pouca variação de frutas e legumes a partir dos seis meses. Tal perfil de consumo alimentar indica a necessidade de intervenções cada vez mais precoces para promoção de hábitos alimentares saudáveis.