scholarly journals Evaluation of Long-Lasting Insecticidal Nets (DuraNet®) Under laboratory and Semi-Field Conditions Using Experimental Huts Against Anopheles Mosquitoes in Jimma Zone, Southwestern Ethiopia

2021 ◽  
Vol 15 ◽  
pp. 117863022097473
Author(s):  
Brhane Gebremariam ◽  
Wondwosen Birke ◽  
Wuhib Zeine ◽  
Argaw Ambelu ◽  
Delenasaw Yewhalaw
Keyword(s):  
Insecticide Resistance ◽  
World Health ◽  
Anopheles Mosquitoes ◽  
Southwestern Ethiopia ◽  
Vector Population ◽  
Experimental Huts ◽  
Cone Bioassay ◽  
The Mean ◽  
Health Organization ◽  
Long Lasting Insecticidal Nets

Background: Long-Lasting Insecticidal Nets (LLINs) efficacy could be compromised due to a lot of influences together with user compliance and vector population insecticide resistance status. Thus, this study was to assess the biological efficacy of DuraNet® with the help of the World Health Organization cone bioassay and field experimental hut. Methods: A laboratory and a semi-field conditions experimental huts against Anopheles Mosquitoes were conducted in southwestern Ethiopia from September 2015 to January 2016. The bio efficacy of DuraNet® was evaluated using the WHO cone bioassay test and then its field efficacy was evaluated using experimental huts against the malaria vector population. Results: World Health Organization cone bioassay tests against pyrethroid-resistant An. arabiensis led to mean percent mortality and knockdown of 78% and 93%, respectively. Washing of DuraNet® successively reduced its efficacy from 93% knockdown (0 wash) to 45% knockdown (20 washes). Similarly, mean mortality decreased from 84% (0 wash) to 47% (20 washes). A total of 1575 female mosquitoes were collected over 40 nights out of which 1373(87.8%) were An. gambiae s.l., 116 (7.4%) were Anopheles coustani and 107 (6.8%) were An. pharoensis. The mean blood-feeding rate was significantly lower ( P < .001) in hut containing unwashed DuraNet® when compared to hut containing untreated DuraNet®. The mean mortality rate was significantly higher ( P < .001) in hut containing DuraNet® when compared to hut containing untreated DuraNet®. Unwashed DuraNet® showed the highest personal protection 88.7% and 100% against An. Arabiensis and An. pharoensis, respectively. Conclusion: Both DuraNet® and PermaNet 2.0 moderate efficacy against a pyrethroid-resistant population of An. arabiensis from Ethiopia. The bio efficacy of DuraNet® was found below the WHO recommendation. Therefore, the real impact of the observed insecticide resistance against DuraNet® to be further studied under phase-III trials, the need for new alternative vector control tools remains critical.

scholarly journals Increased prevalence of insecticide resistance in Anopheles coluzzii populations in the city of Yaoundé, Cameroon and influence on pyrethroid-only treated bed net efficacy

Parasite ◽  
2021 ◽  
Vol 28 ◽  
pp. 8
Author(s):  
Roland Bamou ◽  
Edmond Kopya ◽  
Leslie Diane Nkahe ◽  
Benjamin D. Menze ◽  
Parfait Awono-Ambene ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Malaria Vector ◽  
Blood Feeding ◽  
World Health ◽  
Bed Nets ◽  
Anopheles Coluzzii ◽  
Feeding Inhibition ◽  
Cone Bioassay ◽  
Health Organization ◽  
The City

In Cameroon, pyrethroid-only long-lasting insecticidal nets (LLINs) are still largely used for malaria control. The present study assessed the efficacy of such LLINs against a multiple-resistant population of the major malaria vector, Anopheles coluzzii, in the city of Yaoundé via a cone bioassay and release-recapture experimental hut trial. Susceptibility of field mosquitoes in Yaoundé to pyrethroids, DDT, carbamates and organophosphate insecticides was investigated using World Health Organization (WHO) bioassay tube tests. Mechanisms of insecticide resistance were characterised molecularly. Efficacy of unwashed PermaNet® 2.0 was evaluated against untreated control nets using a resistant colonised strain of An. coluzzii. Mortality, exophily and blood feeding inhibition were estimated. Field collected An. coluzzii displayed high resistance with mortality rates of 3.5% for propoxur (0.1%), 4.16% for DDT (4%), 26.9% for permethrin (0.75%), 50.8% for deltamethrin (0.05%), and 80% for bendiocarb (0.1%). High frequency of the 1014F west-Africa kdr allele was recorded in addition to the overexpression of several detoxification genes, such as Cyp6P3, Cyp6M2, Cyp9K1, Cyp6P4 Cyp6Z1 and GSTe2. A low mortality rate (23.2%) and high blood feeding inhibition rate (65%) were observed when resistant An. coluzzii were exposed to unwashed PermaNet® 2.0 net compared to control untreated net (p < 0.001). Furthermore, low personal protection (52.4%) was observed with the resistant strain, indicating reduction of efficacy. The study highlights the loss of efficacy of pyrethroid-only nets against mosquitoes exhibiting high insecticide resistance and suggests a switch to new generation bed nets to improve control of malaria vector populations in Yaoundé.

scholarly journals Vaccination Coverage for Routine Vaccines and Herd Immunity Levels against Measles and Pertussis in the World in 2019

Vaccines ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 256
Author(s):  
Pedro Plans-Rubió
Keyword(s):  
Vaccination Coverage ◽  
Action Plan ◽  
Herd Immunity ◽  
World Health ◽  
Immunization Programs ◽  
National Immunization ◽  
The World ◽  
Measles Vaccination ◽  
The Mean ◽  
Health Organization

In 2012, the World Health Organization (WHO) established the Global Vaccine Action Plan with the objective to promote essential vaccinations in all countries and achieve at least 90% vaccination coverage for all routine vaccines by 2020. The study assessed the mean percentages of vaccination coverage in 2019 for 13 routine vaccines, vaccination coverage variation from 2015 to 2019, and herd immunity levels against measles and pertussis in 2019 in countries and regions of WHO. In 2019, the mean percentages of vaccination coverage were lower than 90% for 10 (78.9%) routine vaccines. The mean percentages of vaccination coverage also decreased from 2015 to 2019 for six (46.2%) routine vaccines. The prevalence of individuals with vaccine-induced measles immunity in the target measles vaccination population was 88.1%, and the prevalence of individuals with vaccine-induced pertussis immunity in the target pertussis vaccination population was 81.1%. Herd immunity against measles viruses with Ro = 18 was established in 63 (32.5%) countries but not established in any region. Herd immunity against pertussis agents was not established in any country and in any region of WHO. National immunization programs must be improved to achieve ≥90% vaccination coverage in all countries and regions. Likewise, it is necessary to achieve ≥95% vaccination coverage with two doses of measles vaccines and three doses of pertussis vaccines in all countries and regions.

scholarly journals The use of vitreous renal chemistries in the discrimination of postmortem fresh water drowning

2021 ◽  
Vol 5 ◽  
pp. 239784732199752
Author(s):  
Eni-yimini Solomon Agoro ◽  
Charles German Ikimi ◽  
Tommy Edidiong
Keyword(s):  
Fresh Water ◽  
Biochemical Parameters ◽  
World Health ◽  
The World ◽  
Diacetyl Monoxime ◽  
Water Pond ◽  
The Mean ◽  
Health Organization ◽  
Post Hoc ◽  
Cover Up

Background: The World Health Organization (WHO) has estimated drowning as the leading cause of unintentional death in the world, with 372,000 deaths reported annually. Not all drowning are unintentional; some could be disguised to cover up an act of heinous criminality. This study was aimed at using some vitreous renal function biochemical parameters as a discriminant of postmortem fresh water drowning. Twelve albino rabbits constituted the sample size as validated by Mead’s formula. The study was divided into three groups; the control, postmortem-drowned and truly drowned as mimicked using an artificial fresh water pond. Vitreous humours were extracted using Coe method. The vitreous renal chemistries were analysed using diacetyl monoxime, Jaffe’s test, uricase and ion-selective electrode (ISE) methods respectively. Result: The mean of vitreous creatinine, urea, uric acid, Na+, K+, Cl−, Ca2+, glucose and CO2 of the control, postmortem-drowned and truly drowned groups were compared using One-way Anova (post-hoc-LSD) with the aid of SPSS Inc., Chicago, IL, USA; Version 18–21 package. The findings revealed a significant increase in concentrations of vitreous creatinine, glucose, Ca2+ and K+ of the drowned death group, whereas vitreous concentrations of CO2 and urea significantly decreased when compared to the controls and/or postmortem-drowned death. Conclusion: The study has shown that some of the studied vitreous biochemical parameters could be used as an ancillary tool in discriminating death due to fresh water drowning from that of disguised or postmortem-drowned death.

scholarly journals Dental caries in 6-12-year-old indigenous and non-indigenous schoolchildren in the Amazon basin of Ecuador

2008 ◽  
Vol 19 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Widman Medina ◽  
Anna-Karin Hurtig ◽  
Miguel San Sebastián ◽  
Edy Quizhpe ◽  
Cristian Romero
Keyword(s):  
Amazon Basin ◽  
Ethnic Origin ◽  
World Health ◽  
Caries Experience ◽  
Cross Sectional ◽  
Health Response ◽  
Indigenous Children ◽  
Prevention And Health Promotion ◽  
The Mean ◽  
Health Organization

The purpose of this study was to evaluate the caries experience among 6-12-year-old indigenous (Naporunas) and non-indigenous (recent settlers of mixed ethnic origin) schoolchildren, living in the Amazon basin of Ecuador. Cross-sectional data were obtained from 1,449 clinical exams according to the World Health Organization criteria. Nine (7.6%) indigenous and 3 (4.5%) non-indigenous children had no caries experience in their primary dentition at the age of 6. The mean dmft value (SD) among indigenous and non-indigenous children aged 6 was 6.40 (3.36) and 8.36 (3.93), respectively. Sixty-four (54.2%) indigenous and 29 (43.3%) non-indigenous children had no caries experience in their permanent first molars at the age of 6. Only 7 (6.26%) indigenous and 2 (2.60%) non-indigenous children were caries-free at the age of 12. The mean DMFT values (SD) for 12-year-olds were 4.47 (2.85) among indigenous and 5.25 (2.89) among non-indigenous children. Fillings were almost non existent. Caries rates were high among both groups, with untreated carious lesions predominating in all ages. The data of indigenous children suggest adoption of a non-traditional diet. An appropriate oral health response based primarily on prevention and health promotion is needed.

scholarly journals PRESENCE AND LEVELS OF CONCENTRATION OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) IN SMOKED FISH, HIDES AND SKIN OF SLAUGHTER CATTLE AND GOATS IN AWKA URBAN, NIGERIA

2019 ◽  
pp. 14-17
Author(s):  
IKECHUKWU OFOMATA ◽  
LYNDA ONYINYE OBODOECHI ◽  
REGINALD IKECHUKWU OBIDIKE ◽  
JOHN ANAELOM NWANTA
Keyword(s):  
World Health ◽  
Fish Tissues ◽  
Anambra State ◽  
Smoked Fish ◽  
Permissible Level ◽  
Flame Ionization ◽  
Slaughter Cattle ◽  
Polycyclic Aromatic ◽  
The Mean ◽  
Health Organization

Objective: This study evaluated the presence and concentration of PAHs in singed and unsinged hides and skin of slaughter cattle and goats and smoked and non-smoked fish in Awka urban area of Anambra State, Nigeria. Methods: Sixty samples of singed and unsinged hides and skin for were collected from Kwata slaughterhouse in Awka town where fish tissues were also collected from fish smoking spots in Awka urban. The samples were examined for the presence PAHs such as: benzo[a]pyrene; benzo[a]anthracene; benzo[k]flouranthene and indeno[1-2-3cd]pyrene using gas chromatography equipped with flame ionization detector. Results: The result showed that the mean concentrations (µg/kg) of benzo[a]pyrene and indeno [1-2-3cd]pyrene in unsinged cattle hides were 7.89±7.77 and 2.25±0.97 respectively. The mean concentrations upon singeing were of 15.81±14.93 and 3.55±2.89. The mean concentrations (µg/kg) of benzo[a]pyrene; benzo[k]flouranthene and indeno[1-2-3cd]pyrene in unsigned goat skins were 6.52±10.77; 6.58±5.93 and 3.48±0.00 respectively. When the goatskin was singed, the mean concentrations were 17.50±26.03; 10.84±11.19 and 8.79±11.77. The mean concentrations (µg/kg) of benzo[a]pyrene; benzo[k]flouranthene and indeno[1-2-3cd]pyrene in non-smoked fish were 8.65±9.67; 2.11±2.10 and 54.76±60.35 respectively. When the fish were smoked, the mean concentrations of 26.42±40.21; 6.64±11.11 and 599.36±1395.61 were recorded respectively. In all species of animals sampled, no trace of benzo[a]anthracene was detected. Conclusion: The mean concentrations of all carcinogenic PAHs detected in this work were below the maximum permissible level set by World Health Organization (WHO) and European Commission (30µg/kg) with the exception of indeno[1-2-3cd]pyrene in smoked and non-smoked fish, which was far above the permissible level.

scholarly journals Assessment of quality of life in type 2 diabetes mellitus patients using World Health Organization quality of life-BREF questionnaire and appraisal of diabetes scale - a cross-sectional study

2021 ◽  
Vol 15 (3) ◽  
Author(s):  
Supriya Patil ◽  
Yamini Patil ◽  
Sanjay Kumar Patil
Keyword(s):  
Quality Of Life ◽  
Cross Sectional Study ◽  
World Health ◽  
Diabetic Patients ◽  
Sectional Study ◽  
Cross Sectional ◽  
The Mean ◽  
Health Organization

Diabetes is a chronic metabolic disorder that disturbs the quality of life (QOL) of patients. Therefore, evaluation of diabetes- related QOL could be a key outcome measure for its management. This study assessed the QOL in type 2 diabetes mellitus (T2DM) patients using the World Health Organization (WHO) quality of life (QOL)˗BREF questionnaire and disease-specific appraisal of diabetes scale (ADS). In this cross-sectional study, 520 T2DM patients were included. Patients’ demographic data, clinical information was collected through interviews, and the WHOQOL-BREF instrument and ADS were used for the QOL of patients. Statistical analysis was performed by using R software (Version 3.6.0). The mean ADS scores were lower in controlled diabetic subjects (18.50±3.08) and higher in uncontrolled diabetic subjects (19.29±2.73) (P<0.05). For WHOQOL-BREF, the mean scores for all the domains (overall general health, physical, psychological, social, and environmental) were significantly higher in controlled diabetic subjects (P<0.001). In addition, the age, duration of diabetes, associated comorbidities, treatment, and HbA1c level of patients showed a highly significant correlation with WHOQOL-BREF (P<0.001). Diabetic patients had poor-to-average QOL. Therefore, public health measures and education of diabetic patients are essential to create more awareness for improving the QOL of T2DM.

Insecticide Resistance in Anopheles stephensi in Somali Region, Eastern Ethiopia

2020 ◽  
Author(s):  
Solomon Yared ◽  
Araya Gebressielasie ◽  
Lambodhar Damodaran ◽  
Victoria Bonnell ◽  
Karen Lopez ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Anopheles Stephensi ◽  
Mortality Rates ◽  
Resistance Mechanisms ◽  
World Health ◽  
Malaria Vectors ◽  
Eastern Ethiopia ◽  
Pyrethroid Insecticides ◽  
Pirimiphos Methyl ◽  
Health Organization

Abstract Background: The movement of malaria vectors into new areas is a growing concern in the efforts to control malaria. The recent report of Anopheles stephensi in eastern Ethiopia has raised the necessity to understand the insecticide resistance status of the vector in the region to better inform vector-based interventions. The aim of this study was to evaluate insecticide resistance in An. stephensi in eastern Ethiopia using two approaches: 1) World Health Organization (WHO) bioassay tests in An. stephensi and 2) genetic analysis of insecticide resistance genes in An. stephensi in eastern Ethiopia. Methods: Mosquito larvae and pupae were collected from Kebridehar. Insecticide susceptibility of An. stephensi was tested with malathion 5%, bendiocarb 0.1%, propoxur 0.1%, deltamethrin 0.05%, permethrin 0.75%, Pirimiphos-methyl 0.25% and DDT 4%, according to WHO standard protocols. Results: All An. stephensi samples were resistant to carbamates, with mortality rates 23% and 21% for bendiocarb and propoxur, respectively. Adult An. stephensi was also resistant to pyrethroid insecticides with mortality rates 67% for deltamethrin and 53% for permethrin. Resistance to DDT and malathion was detected in An. stephensi with mortality rates of 32% as well as An. stephensi was resistance to pirimiphos-methyl with mortality rates 14%. Analysis of the voltage gate sodium channel gene (vgsc) revealed the absence of kdr L1014 mutations. Conclusion: Overall, these findings support that An. stephensi is resistant to several classes of insecticides, most notably pyrethroids. However, the absence of the kdr L1014 gene may suggest non-target site resistance mechanisms. Continuous insecticide resistance monitoring should be carried out in the region to confirm the documented resistance and exploring mechanisms conferring resistance in An. stephensi in Ethiopia.

scholarly journals Assessing Insecticide Resistance in Adult Mosquitoes: Perspectives on Current Methods

2020 ◽  
Vol 14 ◽  
pp. 117863022095279
Author(s):  
Stephanie L Richards ◽  
Brian D Byrd ◽  
Michael H Reiskind ◽  
Avian V White
Keyword(s):  
Insecticide Resistance ◽  
Training Programs ◽  
Data Interpretation ◽  
Control Measures ◽  
World Health ◽  
Control Programs ◽  
Global Issue ◽  
Control And Prevention ◽  
Health Organization ◽  
Level Training

Mosquito insecticide resistance (IR) is a growing global issue that must be addressed to protect public health. Vector control programs (VCPs) should regularly monitor local mosquito populations for IR and plan control measures accordingly. In some cases, state/federal resources financially support this testing with expertise and/or training programs. Standardization of methods (eg, Centers for Disease Control and Prevention bottle bioassay, World Health Organization tube testing, dose-mortality bioassay) for monitoring IR must be prioritized. One solution is regional hubs of IR monitoring at the state or other level. Training programs on methodology and interpretation of results should be developed and routinely offered to local VCPs conducting IR testing in mosquitoes. Here, current methods for assessing mosquito IR are discussed and insights into a variety of questions from VCPs are considered. It is critical that methods for IR monitoring and data interpretation are standardized through routine training, with the goal of evidence-driven decision making to improve control of mosquitoes and mosquito-borne disease.

scholarly journals Assessment of the susceptibility status of Aedes aegypti (Diptera: Culicidae) populations to pyriproxyfen and malathion in a nation-wide monitoring of insecticide resistance performed in Brazil from 2017 to 2018

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Kauara Brito Campos ◽  
Ademir Jesus Martins ◽  
Cynara de Melo Rodovalho ◽  
Diogo Fernandes Bellinato ◽  
Luciana dos Santos Dias ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Mosquito Control ◽  
Natural Populations ◽  
Adult Emergence ◽  
World Health ◽  
Two Generations ◽  
Wide Scale ◽  
Susceptibility Tests ◽  
The One ◽  
Health Organization

Abstract Background Chemical mosquito control using malathion has been applied in Brazil since 1985. To obtain chemical control effectiveness, vector susceptibility insecticide monitoring is required. This study aimed to describe bioassay standardizations and determine the susceptibility profile of Ae. aegypti populations to malathion and pyriproxyfen, used on a national scale in Brazil between 2017 and 2018, and discuss the observed impacts in arbovirus control. Methods The diagnostic-doses (DD) of pyriproxyfen and malathion were determined as the double of adult emergence inhibition (EI) and lethal doses for 99% of the Rockefeller reference strain, respectively. To monitor natural populations, sampling was performed in 132 Brazilian cities, using egg traps. Colonies were raised in the laboratory for one or two generations (F1 or F2) and submitted to susceptibility tests, where larvae were exposed to the pyriproxyfen DD (0.03 µg/l) and adults, to the malathion DD determined in the present study (20 µg), in addition to the one established by the World Health Organization (WHO) DD (50 µg) in a bottle assay. Dose-response (DR) bioassays with pyriproxyfen were performed on populations that did not achieve 98% EI in the DD assays. Results Susceptibility alterations to pyriproxyfen were recorded in six (4.5%) Ae. aegypti populations from the states of Bahia and Ceará, with Resistance Ratios (RR95) ranging from 1.51 to 3.58. Concerning malathion, 73 (55.3%) populations distributed throughout the country were resistant when exposed to the local DD 20 µg/bottle. On the other hand, no population was resistant, and only 10 (7.6%) populations in eight states were considered as exhibiting decreased susceptibility (mortality ratios between 90 and 98%) when exposed to the WHO DD (50 µg/bottle). Conclusions The feasibility of conducting an insecticide resistance monitoring action on a nation-wide scale was confirmed herein, employing standardized and strongly coordinated sampling methods and laboratory bioassays. Brazilian Ae. aegypti populations exhibiting decreased susceptibility to pyriproxyfen were identified. The local DD for malathion was more sensitive than the WHO DD for early decreased susceptibility detection.

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