scholarly journals Exposure, hazard, and vulnerability all contribute to Schistosoma haematobium re-infection in northern Senegal

2021 ◽  
Vol 15 (10) ◽  
pp. e0009806
Author(s):  
Andrea J. Lund ◽  
Susanne H. Sokolow ◽  
Isabel J. Jones ◽  
Chelsea L. Wood ◽  
Sofia Ali ◽  
...  
Keyword(s):  
Schistosoma Haematobium ◽  
Negative Binomial ◽  
Disease Risk ◽  
Model Averaging ◽  
Infection Intensity ◽  
Positive Association ◽  
Environmental Hazard ◽  
Ecological Data ◽  
Water Contact ◽  
Environmental Interventions

Background Infectious disease risk is driven by three interrelated components: exposure, hazard, and vulnerability. For schistosomiasis, exposure occurs through contact with water, which is often tied to daily activities. Water contact, however, does not imply risk unless the environmental hazard of snails and parasites is also present in the water. By increasing reliance on hazardous activities and environments, socio-economic vulnerability can hinder reductions in exposure to a hazard. We aimed to quantify the contributions of exposure, hazard, and vulnerability to the presence and intensity of Schistosoma haematobium re-infection. Methodology/Principal findings In 13 villages along the Senegal River, we collected parasitological data from 821 school-aged children, survey data from 411 households where those children resided, and ecological data from all 24 village water access sites. We fit mixed-effects logistic and negative binomial regressions with indices of exposure, hazard, and vulnerability as explanatory variables of Schistosoma haematobium presence and intensity, respectively, controlling for demographic variables. Using multi-model inference to calculate the relative importance of each component of risk, we found that hazard (Ʃwi = 0.95) was the most important component of S. haematobium presence, followed by vulnerability (Ʃwi = 0.91). Exposure (Ʃwi = 1.00) was the most important component of S. haematobium intensity, followed by hazard (Ʃwi = 0.77). Model averaging quantified associations between each infection outcome and indices of exposure, hazard, and vulnerability, revealing a positive association between hazard and infection presence (OR = 1.49, 95% CI 1.12, 1.97), and a positive association between exposure and infection intensity (RR 2.59–3.86, depending on the category; all 95% CIs above 1) Conclusions/Significance Our findings underscore the linkages between social (exposure and vulnerability) and environmental (hazard) processes in the acquisition and accumulation of S. haematobium infection. This approach highlights the importance of implementing both social and environmental interventions to complement mass drug administration.

scholarly journals Bovine tuberculosis breakdown duration in cattle herds: an investigation of herd, host, pathogen and wildlife risk factors

2019 ◽  
Author(s):  
Georgina Milne ◽  
Adrian Allen ◽  
Jordon Graham ◽  
Angela Lahuerta-Marin ◽  
Carl McCormick ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Negative Binomial ◽  
Disease Risk ◽  
Financial Burden ◽  
Univariate Analysis ◽  
Positive Association ◽  
Herd Size ◽  
Movement Restriction ◽  
Factors Associated ◽  
The Impact

Background. Despite rigorous controls placed on herds which disclose antemortem test positive cattle to bovine tuberculosis, caused by the infection of Mycobacterium bovis, many herds in Northern Ireland (NI) experience prolonged breakdowns. These herds represent a considerable administrative and financial burden to the State and farming community. Methods. A retrospective observational study was conducted to better understand the factors associated with breakdown duration, which was modelled using both negative binomial and ordinal regression approaches. Six explanatory variables were important predictors of breakdown length in both models; herd size, the number of reactors testing positive in the initial SICCT test, the presence of a lesioned animal at routine slaughter (LRS), the count of M. bovis genotypes during the breakdown (MLVA richness), the local herd-level bTB prevalence, and the presence of herds linked via management factors (associated herds). Results. We report that between 2008 and 2014, mean breakdown duration in NI was 226 days (approx. seven months; median; 188 days). In the same period, however, more than 6% of herds in the region remained under movement restriction for more than 420 days (13 months); almost twice as long as the mean. The MLVA richness variable was a particularly important predictor of breakdown duration. We contend that this variable primarily represents a proxy for beef fattening herds, which can operate by purchasing cattle and selling animals straight to slaughter, despite prolonged trading restrictions. For other herd types, the model supports the hypothesis that prolonged breakdowns are a function of both residual infection within the herd, and infection from the environment (e.g. infected wildlife, contiguous herds and/or a contaminated environment). The impact of badger density on breakdown duration was assessed by including data on main sett (burrow) density. Whilst a positive association was observed in the univariate analysis, confounding with other variables means that the contribution of badgers to prolonged breakdowns was not clear from our study. We do not fully reject the hypothesis that badgers are implicated in prolonging bTB breakdowns via spillback infection, but given our results, we posit that increased disease risk from badgers is unlikely to simply be a function of increasing badger density measured using sett metrics.

scholarly journals Bovine tuberculosis breakdown duration in cattle herds: an investigation of herd, host, pathogen and wildlife risk factors

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8319 ◽  
Author(s):  
Georgina Milne ◽  
Adrian Allen ◽  
Jordon Graham ◽  
Angela Lahuerta-Marin ◽  
Carl McCormick ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Negative Binomial ◽  
Disease Risk ◽  
Financial Burden ◽  
Univariate Analysis ◽  
Positive Association ◽  
Herd Size ◽  
Movement Restriction ◽  
Factors Associated ◽  
The Impact

Background Despite rigorous controls placed on herds which disclose ante-mortem test positive cattle to bovine tuberculosis, caused by the infection of Mycobacterium bovis, many herds in Northern Ireland (NI) experience prolonged breakdowns. These herds represent a considerable administrative and financial burden to the State and farming community. Methods A retrospective observational study was conducted to better understand the factors associated with breakdown duration, which was modelled using both negative binomial and ordinal regression approaches. Results Six explanatory variables were important predictors of breakdown length in both models; herd size, the number of reactors testing positive in the initial SICCT test, the presence of a lesioned animal at routine slaughter (LRS), the count of M. bovis genotypes during the breakdown (MLVA richness), the local herd-level bTB prevalence, and the presence of herds linked via management factors (associated herds). We report that between 2008 and 2014, mean breakdown duration in NI was 226 days (approx. seven months; median: 188 days). In the same period, however, more than 6% of herds in the region remained under movement restriction for more than 420 days (13 months); almost twice as long as the mean. The MLVA richness variable was a particularly important predictor of breakdown duration. We contend that this variable primarily represents a proxy for beef fattening herds, which can operate by purchasing cattle and selling animals straight to slaughter, despite prolonged trading restrictions. For other herd types, the model supports the hypothesis that prolonged breakdowns are a function of both residual infection within the herd, and infection from the environment (e.g. infected wildlife, contiguous herds and/or a contaminated environment). The impact of badger density on breakdown duration was assessed by including data on main sett (burrow) density. Whilst a positive association was observed in the univariate analysis, confounding with other variables means that the contribution of badgers to prolonged breakdowns was not clear from our study. We do not fully reject the hypothesis that badgers are implicated in prolonging bTB breakdowns via spillback infection, but given our results, we posit that increased disease risk from badgers is unlikely to simply be a function of increasing badger density measured using sett metrics.

scholarly journals Bovine tuberculosis breakdown duration in cattle herds: an investigation of herd, host, pathogen and wildlife risk factors

2019 ◽  
Author(s):  
Georgina Milne ◽  
Adrian Allen ◽  
Jordon Graham ◽  
Angela Lahuerta-Marin ◽  
Carl McCormick ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Negative Binomial ◽  
Disease Risk ◽  
Financial Burden ◽  
Univariate Analysis ◽  
Positive Association ◽  
Herd Size ◽  
Movement Restriction ◽  
Factors Associated ◽  
The Impact

Background. Despite rigorous controls placed on herds which disclose antemortem test positive cattle to bovine tuberculosis, caused by the infection of Mycobacterium bovis, many herds in Northern Ireland (NI) experience prolonged breakdowns. These herds represent a considerable administrative and financial burden to the State and farming community. Methods. A retrospective observational study was conducted to better understand the factors associated with breakdown duration, which was modelled using both negative binomial and ordinal regression approaches. Six explanatory variables were important predictors of breakdown length in both models; herd size, the number of reactors testing positive in the initial SICCT test, the presence of a lesioned animal at routine slaughter (LRS), the count of M. bovis genotypes during the breakdown (MLVA richness), the local herd-level bTB prevalence, and the presence of herds linked via management factors (associated herds). Results. We report that between 2008 and 2014, mean breakdown duration in NI was 226 days (approx. seven months; median; 188 days). In the same period, however, more than 6% of herds in the region remained under movement restriction for more than 420 days (13 months); almost twice as long as the mean. The MLVA richness variable was a particularly important predictor of breakdown duration. We contend that this variable primarily represents a proxy for beef fattening herds, which can operate by purchasing cattle and selling animals straight to slaughter, despite prolonged trading restrictions. For other herd types, the model supports the hypothesis that prolonged breakdowns are a function of both residual infection within the herd, and infection from the environment (e.g. infected wildlife, contiguous herds and/or a contaminated environment). The impact of badger density on breakdown duration was assessed by including data on main sett (burrow) density. Whilst a positive association was observed in the univariate analysis, confounding with other variables means that the contribution of badgers to prolonged breakdowns was not clear from our study. We do not fully reject the hypothesis that badgers are implicated in prolonging bTB breakdowns via spillback infection, but given our results, we posit that increased disease risk from badgers is unlikely to simply be a function of increasing badger density measured using sett metrics.

Family Environment and Its Correlation with Anxiety and Depression: A Study on Heart Patients

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Dr. Meena Jain ◽  
Saloni Chandalia
Keyword(s):  
Heart Disease ◽  
Family Environment ◽  
Heart Attack ◽  
Psychiatric Symptoms ◽  
Disease Risk ◽  
Positive Association ◽  
Anxiety And Depression ◽  
Depression And Anxiety ◽  
Increased Risk ◽  
Artery Disease

This research paper deals with the Family Environment and its Correlation with Anxiety and Depression level among persons with Heart Disease. There had been a number of researches that investigated that ischemic heart disease patients who suffer significant anxiety have close to a 5-fold increased risk of experiencing frequent angina and those with depression have more than a 3-fold increased risk for these episodes. This observed link between psychiatric symptoms and angina underlines the importance of treating anxiety and depression in cardiac patients, according to study co author Dr Mark D Sullivan (University of Washington School of Medicine, Seattle). To gather the needed data, Hamilton Anxiety Scale and Becks Depression Inventory were used. As stated from literatures, for people with heart dysfunction, depression and anxiety can increase the risk of an adverse cardiac event such as a heart attack or blood clots. For people who do not have heart disease, depression and anxiety can also increase the risk of a heart attack and development of coronary artery disease. Researchers have also emphasized on the role of family psychosocial environment and its positive association with the Coronary Heart Disease risk.

scholarly journals Multiple air pollutant exposure and lung cancer in Tehran, Iran

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zahra Khorrami ◽  
Mohsen Pourkhosravani ◽  
Maysam Rezapour ◽  
Koorosh Etemad ◽  
Seyed Mahmood Taghavi-Shahri ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Air Pollution ◽  
Cancer Incidence ◽  
Latent Profile Analysis ◽  
Negative Binomial ◽  
Profile Analysis ◽  
Positive Association ◽  
Air Pollutant ◽  
World Health ◽  
Lung Cancer Incidence

AbstractLung cancer is the most rapidly increasing malignancy worldwide with an estimated 2.1 million cancer cases in the latest, 2018 World Health Organization (WHO) report. The objective of this study was to investigate the association of air pollution and lung cancer, in Tehran, Iran. Residential area information of the latest registered lung cancer cases that were diagnosed between 2014 and 2016 (N = 1,850) were inquired from the population-based cancer registry of Tehran. Long-term average exposure to PM10, SO2, NO, NO2, NOX, benzene, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene (BTEX), and BTEX in 22 districts of Tehran were estimated using land use regression models. Latent profile analysis (LPA) was used to generate multi-pollutant exposure profiles. Negative binomial regression analysis was used to examine the association between air pollutants and lung cancer incidence. The districts with higher concentrations for all pollutants were mostly in downtown and around the railway station. Districts with a higher concentration for NOx (IRR = 1.05, for each 10 unit increase in air pollutant), benzene (IRR = 3.86), toluene (IRR = 1.50), ethylbenzene (IRR = 5.16), p-xylene (IRR = 9.41), o-xylene (IRR = 7.93), m-xylene (IRR = 2.63) and TBTEX (IRR = 1.21) were significantly associated with higher lung cancer incidence. Districts with a higher multiple air-pollution profile were also associated with more lung cancer incidence (IRR = 1.01). Our study shows a positive association between air pollution and lung cancer incidence. This association was stronger for, respectively, p-xylene, o-xylene, ethylbenzene, benzene, m-xylene and toluene.

scholarly journals Analysis of Pneumonia Occurrence in Relation to Climate Change in Tanga, Tanzania

2021 ◽  
Vol 18 (9) ◽  
pp. 4731
Author(s):  
Samweli Faraja Miyayo ◽  
Patrick Opiyo Owili ◽  
Miriam Adoyo Muga ◽  
Tang-Huang Lin
Keyword(s):  
Climate Change ◽  
Negative Binomial ◽  
Health Management ◽  
Severe Pneumonia ◽  
Positive Association ◽  
Negative Binomial Regression ◽  
Health Management Information System ◽  
Cold Temperatures ◽  
Climate Indicators ◽  
And Control

In 2018, 70% of global fatalities due to pneumonia occurred in about fifteen countries, with Tanzania being among the top eight countries contributing to these deaths. Environmental and individual factors contributing to these deaths may be multifaceted, but they have not yet been explored in Tanzania. Therefore, in this study, we explore the association between climate change and the occurrence of pneumonia in the Tanga Region, Tanzania. A time series study design was employed using meteorological and health data of the Tanga Region collected from January 2016 to December 2018 from the Tanzania Meteorological Authority and Health Management Information System, respectively. The generalized negative binomial regression technique was used to explore the associations between climate indicators (i.e., precipitation, humidity, and temperature) and the occurrence of pneumonia. There were trend differences in climate indicators and the occurrence of pneumonia between the Tanga and Handeni districts. We found a positive association between humidity and increased rates of non-severe pneumonia (incidence rate ratio (IRR) = 1.01; 95% CI: 1.01–1.02; p ≤ 0.05) and severe pneumonia (IRR = 1.02; 95% CI: 1.01–1.03; p ≤ 0.05). There was also a significant association between cold temperatures and the rate of severe pneumonia in Tanga (IRR = 1.21; 95% CI: 1.11–1.33; p ≤ 0.001). Other factors that were associated with pneumonia included age and district of residence. We found a positive relationship between humidity, temperature, and incidence of pneumonia in the Tanga Region. Policies focusing on prevention and control, as well as promotion strategies relating to climate change-related health effects should be developed and implemented.

Interactions between parasites of the cockleAustrovenus stutchburyi: hitch-hikers, resident-cleaners, and habitat-facilitators

Parasitology ◽  
2006 ◽  
Vol 134 (2) ◽  
pp. 247-255 ◽  
Author(s):  
T. L. F. LEUNG ◽  
R. POULIN
Keyword(s):  
New Zealand ◽  
Parasite Species ◽  
Infection Intensity ◽  
Positive Association ◽  
Parasite Community ◽  
Transmission Route ◽  
Interspecific Associations ◽  
Number Of Factors ◽  
Austrovenus Stutchburyi ◽  
Rate Of Accumulation

The patterns of association between parasites within a particular host are determined by a number of factors. One of these factors is whether or not infection by one parasite influences the probability of acquiring other parasite species. This study investigates the pattern of association between various parasites of the New Zealand cockleAustrovenus stutchburyi. Hundreds of cockles were collected from one locality within Otago Harbour, New Zealand and examined for trematode metacercariae and other symbionts. Two interspecific associations emerged from the study. First, the presence of the myicolid copepodPseudomyicola spinosuswas positively associated with higher infection intensity by echinostomes. The side-effect of the copepod's activities within the cockle is suggested as the proximate mechanism that facilitates infection by echinostome cercariae, leading to a greater rate of accumulation of metacercariae in cockles harbouring the copepod. Second, a positive association was also found between infection intensity of the metacercariae of foot-encysting echinostomes and that of gymnophallid metacercariae. This supports earlier findings and suggests that the gymnophallid is a hitch-hiker parasite because, in addition to the pattern of positive association, it (a) shares the same transmission route as the echinostomes, and (b) unlike the echinostomes, it is not capable of increasing the host's susceptibility to avian predation. Thus, both active hitch-hiking and incidental facilitation lead to non-random infection patterns in this parasite community.

Abstract MP012: Plasma Galectin-3 Levels and Subsequent Risk of Incident Chronic Kidney Disease

Circulation ◽  
2017 ◽  
Vol 135 (suppl_1) ◽  
Author(s):  
Casey M Rebholz ◽  
Elizabeth Selvin ◽  
Menglu Liang ◽  
Christie M Ballantyne ◽  
Ron C Hoogeveen ◽  
...  
Keyword(s):  
Heart Failure ◽  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Proportional Hazards ◽  
Disease Risk ◽  
Positive Association ◽  
Cox Proportional Hazards ◽  
Diabetes Status ◽  
Incident Chronic Kidney Disease ◽  
Galectin 3

Introduction: Galectin-3 is a 35 kDa β-galactoside-binding lectin which has been proposed as a novel biomarker of heart failure primarily due to its involvement in myocardial fibrosis. Elevated levels of galectin-3 may be associated with fibrosis of other organs, such as the kidney, and increase the risk of developing kidney disease. Methods: Using Cox proportional hazards regression, we prospectively analyzed Atherosclerosis Risk in Communities (ARIC) study participants with measurements of plasma galectin-3 levels at baseline (visit 4, 1996-98) and without prevalent kidney disease or heart failure (N=9,647). Incident chronic kidney disease was defined as estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m 2 accompanied by 25% eGFR decline, chronic kidney disease-related hospitalization or death, or end-stage renal disease between baseline and December 31, 2013. Results: 2,105 participants (22%) developed incident chronic kidney disease over a median follow-up of 16 years. The mean (standard deviation) plasma level of galectin-3 was 14.7 (4.4) ng/mL. At baseline, galectin-3 was cross-sectionally associated with eGFR (r = -0.31) and urine albumin-to-creatinine ratio (UACR) (r = 0.19). After adjusting for demographics and kidney disease risk factors, there was a significant, graded, and positive association between galectin-3 and incident chronic kidney disease (quartile 4 vs. 1 HR: 1.84, 95% CI: 1.62, 2.09, p for trend <0.001). The association between galectin-3 and incident chronic kidney disease was attenuated but remained significant after accounting for eGFR and UACR (quartile 4 vs. 1 HR: 1.58, 95% CI: 1.39, 1.80, p for trend <0.001). The association was similar by diabetes status (p for interaction = 0.33) and stronger among those with hypertension (p for interaction = 0.004). Conclusion: In this community-based population, higher plasma galectin-3 levels were associated with elevated risk of developing incident chronic kidney disease, particularly among those with hypertension.

scholarly journals Comparison of the Change in the Prevalence and Intensity of Schistosoma haematobium Infection Between High and Low Prevalence Areas of White Nile State, Sudan

2020 ◽  
Vol 58 (4) ◽  
pp. 421-430 ◽  
Author(s):  
Seungman Cha ◽  
Sung-Tae Hong ◽  
Jin-Su Lee ◽  
Hoo Gn Jeong ◽  
In-Sun Kwon ◽  
...  
Keyword(s):  
Primary Schools ◽  
Schistosoma Haematobium ◽  
Geometric Mean ◽  
Infection Intensity ◽  
Baseline Survey ◽  
Relative Reduction ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Significant Difference ◽  
White Nile

This study aimed to investigate whether mass drug administration (MDA) intervention has an equivalent effect on reducing the prevalence and intensity of Schistosoma haematobium infection regardless of the baseline values. A repeated cross-sectional survey was performed targeting students of 12 primary schools in Al Jabalain and El Salam districts of White Nile State, Sudan, at both 1 week before and 8 months after the MDA. Prior to the baseline survey, school-aged children in Al Jabalain had received MDA interventions twice in 4 years, while those in El Salam had not. The baseline prevalence was 9.1% in Al Jabalain and 35.2% in El Salam, which were reduced to 1.8% and 5.5% at 8 months after the MDA, respectively. The corresponding reduction rates were 80.3% and 84.4%, not significant difference between both districts. However, changes in the geometric mean intensity (GMI) of egg counts were significantly different between both districts. The baseline GMIs were 14.5 eggs per 10 ml of urine (EP10) in Al Jabalain and 18.5 EP10 in El Salam, which were reduced to 7.1 and 11.2 EP10 after treatment, respectively. The corresponding reduction rates were 51.0% and 39.5%. In conclusion, MDA interventions were found to bring about similar relative reduction in prevalence regardless of the baseline value; however, the relative reduction in infection intensity was more salient in the district with a low baseline value for both prevalence and intensity. This clearly points to the importance of repeated MDA interventions in endemic areas, which will eventually contribute to schistosomiasis elimination.

scholarly journals Ecological opportunity shapes a large Arctic charr species radiation

2019 ◽  
Vol 286 (1913) ◽  
pp. 20191992 ◽  
Author(s):  
Carmela J. Doenz ◽  
Andrin K. Krähenbühl ◽  
Jonas Walker ◽  
Ole Seehausen ◽  
Jakob Brodersen
Keyword(s):  
Arctic Charr ◽  
Positive Association ◽  
Distinct Species ◽  
Similar Species ◽  
Small Lakes ◽  
Ecological Data ◽  
Ecological Opportunity ◽  
Intermediate Size ◽  
Variable Population ◽  
Lake Size

Ecological opportunity is considered a crucial factor for adaptive radiation. Here, we combine genetic, morphological and ecological data to assess species and ecomorphological diversity of Artic charr in six lakes of a catchment in southernmost Greenland, where only charr and stickleback occur. Because the diversity of habitats and resources increases with lake size, we predict a positive association between lake size and the extent of ecomorphological diversity. The largest lake of the catchment harbours the largest Arctic charr assemblage known today. It consists of six genetically differentiated species belonging to five ecomorphs (anadromous, littoral benthic, profundal dwarf, planktivorous, piscivorous), of which the latter comprises two ecomorphologically extremely similar species. Lakes of intermediate size contain two ecomorphologically and genetically distinct species. Small lakes harbour one genetically homogeneous, yet sometimes ecomorphologically variable population. Supporting our prediction, lake size is positively correlated with the extent of ecomorphological specialization towards profundal, pelagic and piscivorous lifestyle. Furthermore, assemblage-wide morphospace increases sharply when more than one genetic cluster is present. Our data suggest that ecological opportunity and speciation jointly determine phenotypic expansion in this charr radiation.

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