scholarly journals Lutzomyia longipalpis behavior and control at an urban visceral leishmaniasis focus in Argentina

2010 ◽  
Vol 52 (4) ◽  
pp. 187-191 ◽  
Author(s):  
Maria Soledad Santini ◽  
Oscar Daniel Salomón ◽  
Soraya Alejandra Acardi ◽  
Enrique Adolfo Sandoval ◽  
Lilian Tartaglino
Keyword(s):  
Visceral Leishmaniasis ◽  
Sand Fly ◽  
Bed Nets ◽  
Lutzomyia Longipalpis ◽  
Post Intervention ◽  
Protection Measures ◽  
Time Space ◽  
Local Officials ◽  
And Control ◽  
The Impact

During the earlier stages of visceral leishmaniasis transmission in Posadas City, Misiones, both the night activity and attraction to humans of Lutzomyia longipalpis were assessed, in order to provide preliminary recommendations. The impact of peridomestic deltamethrin spraying performed by local officials was also evaluated. Although Lu. longipalpis were found in traps located over a dog the entire night, 90% of the females were captured from 20.30h to 1.30h, and only landed on a human when he was at a distance of 1.5 m from the dog. Peridomestic spraying of deltamethrin (25 mg/m²) reduced the sand fly capture up to seven days post-intervention without dispersion in the border of the sprayed areas. These results support the recommendations about time-space focus of the protection measures: first half of the night, in the backyard, with pets and domestic animals kept at least 5 m from humans. The deltamethrin as it was used did not seem very effective in this scenario; neither did the eventual use of bed nets, at least in adults, due to the place/hour of sand fly higher activity. This study strengthens the need for a multidisciplinary approach to develop prevention strategies based both on biological and anthropological studies.

scholarly journals Metagenomic Analysis of the Fecal Archaeome in Suckling Piglets Following Perinatal Tulathromycin Metaphylaxis

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1825
Author(s):  
Mohamed Zeineldin ◽  
Ameer Megahed ◽  
Benjamin Blair ◽  
Brian Aldridge ◽  
James Lowe
Keyword(s):  
Sequencing Analysis ◽  
Metagenomic Sequencing ◽  
Post Intervention ◽  
Gastrointestinal Microbiome ◽  
Health And Wellbeing ◽  
Suckling Piglets ◽  
And Function ◽  
Changes Over Time ◽  
And Control ◽  
The Impact

The gastrointestinal microbiome plays an important role in swine health and wellbeing, but the gut archaeome structure and function in swine remain largely unexplored. To date, no metagenomics-based analysis has been done to assess the impact of an early life antimicrobials intervention on the gut archaeome. The aim of this study was to investigate the effects of perinatal tulathromycin (TUL) administration on the fecal archaeome composition and diversity in suckling piglets using metagenomic sequencing analysis. Sixteen litters were administered one of two treatments (TUL; 2.5 mg/kg IM and control (CONT); saline 1cc IM) soon after birth. Deep fecal swabs were collected from all piglets on days 0 (prior to treatment), 5, and 20 post intervention. Each piglet’s fecal archaeome was composed of rich and diverse communities that showed significant changes over time during the suckling period. At the phylum level, 98.24% of the fecal archaeome across all samples belonged to Euryarchaeota. At the genus level, the predominant archaeal genera across all samples were Methanobrevibacter (43.31%), Methanosarcina (10.84%), Methanococcus (6.51%), and Methanocorpusculum (6.01%). The composition and diversity of the fecal archaeome between the TUL and CONT groups at the same time points were statistically insignificant. Our findings indicate that perinatal TUL metaphylaxis seems to have a minimal effect on the gut archaeome composition and diversity in sucking piglets. This study improves our current understanding of the fecal archaeome structure in sucking piglets and provides a rationale for future studies to decipher its role in and impact on host robustness during this critical phase of production.

Dihydroartemisinin-piperaquine chemoprevention and malaria incidence after severe flooding: evaluation of a pragmatic intervention in rural Uganda

2021 ◽  
Author(s):  
Ross M Boyce ◽  
Brandon D Hollingsworth ◽  
Emma Baguma ◽  
Erin Xu ◽  
Varun Goel ◽  
...  
Keyword(s):  
Malaria Incidence ◽  
Mitigation Measures ◽  
Older Children ◽  
Post Intervention ◽  
Rapid Diagnostic Test Result ◽  
Western Uganda ◽  
And Control ◽  
The Impact ◽  
To Receive ◽  
Severe Flooding

Abstract Background Malaria epidemics are a well-described phenomenon after extreme precipitation and flooding, which account for nearly half of global disasters over the past two decades. Yet few studies have examined mitigation measures to prevent post-flood malaria epidemics. Methods We conducted an evaluation of a malaria chemoprevention program implemented in response to severe flooding in western Uganda. Children ≤12 years of age from one village were eligible to receive 3 monthly rounds of dihydroartemisinin-piperaquine (DP). Two neighboring villages served as controls. Malaria cases were defined as individuals with a positive rapid diagnostic test result as recorded in health center registers. We performed a difference-in-differences analysis to estimate changes in the incidence and test positivity of malaria between intervention and control villages. Results A total of 554 children received at least one round of chemoprevention with 75% participating in at least two rounds. Compared to control villages, we estimated a 53.4% reduction (aRR 0.47, 95% CI 0.34 – 0.62, p<.01) in malaria incidence and a 30% decrease in the test positivity rate (aRR=0.70, CI 0.50 - 0.97, p=0.03) in the intervention village in the six months post-intervention. The impact was greatest among children receiving the intervention, but decreased incidence was also observed in older children and adults (aRR=0.57, CI 0.38-0.84, p<.01). Conclusions Three rounds of chemoprevention with DP delivered under pragmatic conditions reduced the incidence of malaria after severe flooding in western Uganda. These findings provide a proof-of-concept for the use of malaria chemoprevention to reduce excess disease burden associated with severe flooding.

Evaluating the Elklan Talking Matters Programme: Exploring the impact of a training programme for early years professionals on pre-school children’s language development

2020 ◽  
Vol 36 (2) ◽  
pp. 108-125
Author(s):  
Judy Clegg ◽  
Carla Rohde ◽  
Henrietta McLachlan ◽  
Liz Elks ◽  
Alex Hall
Keyword(s):  
Language Development ◽  
Positive Impact ◽  
Training Programme ◽  
Early Years ◽  
Post Intervention ◽  
Main Effect ◽  
Tentative Evidence ◽  
Effectiveness Of Training ◽  
And Control ◽  
The Impact

Training early years practitioners to facilitate the language development of young children is a widely used intervention. Evidence to support the effectiveness of training in terms of the impact of children’s language development is limited. The Elklan Talking Matters programme is an accredited training programme for early years practitioners. Practitioners train to be Lead Communication Practitioners (LCPs) who cascade training across early years settings or Key Communication Practitioners (KCPs) who are embedded into these settings. The aim of this study was to identify if the Talking Matters Programme is effective in facilitating the language development of pre-school children. One hundred and twenty-six children from 13 early years settings were recruited (mean age 27.81 months; SD 4.90). Thirteen settings participated in the Talking Matters Programme (five LCP+KCP settings, four LCP settings and four control settings). At time 1, prior to practitioners participating in the programme, children completed the Pre-School Language Scales 5th Edition (PLS-5), a standardized assessment of receptive and expressive language. At time 1, 126 children completed the baseline assessment ( n = 43 in the LCP+KCP settings, n = 43 in the LCP settings and n = 40 in the control settings). Children then completed the post intervention (time 2) assessment approximately six months later. Children in the intervention groups (LCP+KCP settings and LCP settings) made more progress in their language development from time 1 to time 2 compared to the control. The children in the LCP+KCP settings made more gains than the children in the LCP settings. A significant main effect of groups and time was found but not an interaction of group scores with time, meaning the increases in scores were not statistically significant between the intervention and control groups. The study provides tentative evidence that the Talking Matters programme has a positive impact on pre-school children’s language development.

Edmund Burke and the Ambivalence of Protection for Slaves: Between Humanity and Control

2020 ◽  
Vol 22 (2-3) ◽  
pp. 246-268
Author(s):  
Parvathi Menon
Keyword(s):  
British Empire ◽  
Edmund Burke ◽  
Protection Measures ◽  
Slave Rebellion ◽  
The Right ◽  
And Control ◽  
The Impact

Abstract This article focuses on the period between 1812 and 1834, when the British Empire introduced protection measures to mitigate the suffering of slaves from planter brutality, but also to protect planters from slave rebellion. By examining the impact and influences wielded by Edmund Burke’s Sketch of a Negro Code (1780), this article studies protection as an alliance between the abolitionists and planters who, despite contestations, found in Burke’s Code a means to attain their separate ends. Through the workings of the Office of the Protector, instituted by the imperial authorities in the slave colony of Trinidad, this study examines how it granted slaves the humanity of ‘rights’ against their masters, while also protecting the right to property (in slaves) of the planters. I argue that the paternalistic practice of protection was, as is in the present, at the center of the exploitation of subjugated groups.

Entomological Studies in Itaúna, Brazil, an Area With Visceral Leishmaniasis Transmission: Fauna Survey, Natural Leishmania Infection, and Molecular Characterization of the Species Circulating in Phlebotomine Sand Flies (Diptera: Psychodidae)

2019 ◽  
Vol 56 (5) ◽  
pp. 1368-1376 ◽  
Author(s):  
Josiane V Lopes ◽  
Erika M Michalsky ◽  
Nathalia C L Pereira ◽  
Adão J V de Paula ◽  
Fabiana O Lara-Silva ◽  
...  
Keyword(s):  
Visceral Leishmaniasis ◽  
Natural Infection ◽  
Local Population ◽  
Influential Factor ◽  
Sand Fly ◽  
Health Concern ◽  
Leishmania Infection ◽  
Lutzomyia Longipalpis ◽  
Sand Flies ◽  
Phlebotomine Sand Flies

Abstract Among neglected tropical diseases, visceral leishmaniasis (VL) shows great relevance in global terms and is a serious public health concern due to the possibility of severe and lethal forms in humans. In this study, we evaluate entomological factors such as diversity and abundance of phlebotomine sand flies (Diptera:Psychodidae) and the Leishmania species circulating in these species in possible association with VL transmission in the Brazilian town Itaúna. The entomological collections were performed during three consecutive nights, always in the third week of each month, within a period of 12 mo. A total of 1,786 sand fly specimens were collected, from which 20% were collected inside houses. The influence of three local climatic variables (temperature, rainfall, relative humidity) on the population sizes of these insects was evaluated. Temperature was the most influential factor, with a significant positive correlation with the local population size of phlebotomine sand flies collected per month. Lutzomyia longipalpis (Lutz & Neiva, 1912) was the predominant species in the study area. Leishmania DNA was detected in nine out of 133 pools of sand fly females, using nested/PCR, which resulted in a minimal natural infection rate of 2.91%. DNA from Leishmania infantum Nicolle, 1908 (Kinetoplastida: Trypanosomatida), was detected in Evandromyia cortelezzii (Bréthes, 1923), Ev. evandroi (Costa, Lima & Antunes, 1936), Ev. lenti (Mangabeira, 1938), and Ev. termitophila (Martins, Falcão & Silva, 1964), besides Lu. longipalpis. Our study indicates favorable conditions for VL spreading in Itaúna due to the presence of Lu. longipalpis and Le. infantum-infected phlebotomine sand flies.

scholarly journals Associations between Meteorological Factors and Visceral Leishmaniasis Outbreaks in Jiashi County, Xinjiang Uygur Autonomous Region, China, 2005–2015

2019 ◽  
Vol 16 (10) ◽  
pp. 1775 ◽  
Author(s):  
Yi Li ◽  
Canjun Zheng
Keyword(s):  
Relative Humidity ◽  
Visceral Leishmaniasis ◽  
Meteorological Factors ◽  
Public Health Problem ◽  
Monitoring And Control ◽  
Autonomous Region ◽  
Xinjiang Uygur Autonomous Region ◽  
Increasing Temperature ◽  
And Control ◽  
The Impact

Although visceral leishmaniasis disease is controlled overall in China, it remains a serious public health problem and remains fundamentally uncontrolled in Jiashi County, Xinjiang Uygur Autonomous Region. During 2005–2015, there were two outbreaks in Jiashi County. Assessing the influence of meteorological factors on visceral leishmaniasis incidence is essential for its monitoring and control. In this study, we applied generalized estimating equations to assess the impact of meteorological factors on visceral leishmaniasis risk from 2005 to 2015. We also compared meteorological factors among years with Kruskal–Wallis test to explore possible reasons behind the two outbreaks that occurred during our study period. We found that temperature and relative humidity had very significant associations with visceral leishmaniasis risk and there were interactions between these factors. Increasing temperature or decreasing relative humidity could increase the risk of visceral leishmaniasis events. The outbreaks investigated might have been related to low relative humidity and high temperatures. Our findings will support the rationale for visceral leishmaniasis control in China.

Preliminary description of a new entomoparasitic nematode infecting Lutzomyia longipalpis sand fly, the vector of visceral leishmaniasis in the New World

2002 ◽  
Vol 80 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Nágila F.C Secundino ◽  
Márcio S.S Araújo ◽  
Gustavo H.B Oliveira ◽  
Cristiano L Massara ◽  
Omar S Carvalho ◽  
...  
Keyword(s):  
Visceral Leishmaniasis ◽  
New World ◽  
Sand Fly ◽  
Lutzomyia Longipalpis ◽  
Preliminary Description

scholarly journals Insights into the salivary N-glycome of Lutzomyia longipalpis, vector of visceral leishmaniasis

2020 ◽  
Author(s):  
Karina Mondragon-Shem ◽  
Katherine Wongtrakul-Kish ◽  
Radoslaw P. Kozak ◽  
Shi Yan ◽  
Iain Wilson ◽  
...  
Keyword(s):  
Visceral Leishmaniasis ◽  
Immune Responses ◽  
Sand Fly ◽  
Salivary Proteins ◽  
Lutzomyia Longipalpis ◽  
Sand Flies ◽  
Detailed Structural Analysis ◽  
Highly Sensitive ◽  
Sds Page ◽  
Before And After

AbstractDuring Leishmania transmission sand flies inoculate parasites and saliva into the skin of vertebrates. Saliva has anti-haemostatic and anti-inflammatory activities that evolved to facilitate bloodfeeding, but also modulate the host’s immune responses. Sand fly salivary proteins have been extensively studied, but the nature and biological roles of protein-linked glycans remain overlooked. Here, we characterised the profile of N-glycans from the salivary glycoproteins of Lutzomyia longipalpis, vector of visceral leishmaniasis in the Americas. In silico predictions suggest half of Lu. longipalpis salivary proteins may be N-glycosylated. SDS-PAGE coupled to LC-MS analysis of sand fly saliva, before and after enzymatic deglycosylation, revealed several candidate glycoproteins. To determine the diversity of N-glycan structures in sand fly saliva, enzymatically released sugars were fluorescently tagged and analysed by HPLC, combined with highly sensitive LC-MS/MS, MALDI-TOF-MS, and exoglycosidase treatments. We found that the N-glycan composition of Lu. longipalpis saliva mostly consists of oligomannose sugars, with Man5GlcNAc2 being the most abundant, and a few hybrid-type species. Interestingly, some glycans appear modified with a group of 144 Da, whose identity has yet to be confirmed. Our work presents the first detailed structural analysis of sand fly salivary glycans.

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