Seasonal patterns in the transmission of Schistosoma haematobium in Attaouia, Morocco

1992 ◽  
Vol 66 (2) ◽  
pp. 89-95 ◽  
Author(s):  
K. Khallaayoune ◽  
H. Laamrani
Keyword(s):  
Infection Rate ◽  
Schistosoma Haematobium ◽  
Local Population ◽  
Seasonal Patterns ◽  
Water Contact ◽  
Bulinus Truncatus ◽  
One Year ◽  
Weather Variations ◽  
The Village

ABSTRACTIn the Attaouia area, the density of Bulinus truncatus (Audouin, 1827), was monitored monthly for a period of one year in correlation with weather variations. Snails were active throughout the year and particularly abundant at the end of spring and summer. Two snail generations were found to overlap. The infection rate of B. truncatus reached a maximum of 3·5% in the summer when human water contact was frequent. A selective survey conducted in the village of Lamyayha showed that the prevalence of infection with S. haematobium among the local population was 21·2% who were passing from 10 to 80 eggs per 10 ml of urine.

scholarly journals Molecular diversity of Bulinus species in Madziwa area, Shamva district in Zimbabwe: implications for urogenital schistosomiasis transmission

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Masceline Jenipher Mutsaka-Makuvaza ◽  
Xiao-Nong Zhou ◽  
Cremance Tshuma ◽  
Eniola Abe ◽  
Justen Manasa ◽  
...  
Keyword(s):  
Schistosoma Haematobium ◽  
Geographical Area ◽  
Endemic Region ◽  
Urogenital Schistosomiasis ◽  
Water Contact ◽  
Additional Information ◽  
Bulinus Globosus ◽  
Species Groups ◽  
One Year ◽  
Low Prevalence

Abstract Background Bulinus species are freshwater snails that transmit the parasitic trematode Schistosoma haematobium. Despite their importance, the diversity of these intermediate host snails and their evolutionary history is still unclear in Zimbabwe. Bulinus globosus and B. truncatus collected from a urogenital schistosomiasis endemic region in the Madziwa area of Zimbabwe were characterized using molecular methods. Methods Malacological survey sites were mapped and snails were collected from water contact sites in four communities in the Madziwa area, Shamva district for a period of one year, at three-month intervals. Schistosoma haematobium infections in snails were determined by cercarial shedding and the partial mitochondrial cytochrome c oxidase subunit 1 gene (cox1) was used to investigate the phylogeny and genetic variability of the Bulinus spp. collected. Results Among the 1570 Bulinus spp. snails collected, 30 (1.9%) B. globosus were shedding morphologically identified schistosomes. None of the B. truncatus snails were shedding. The mitochondrial cox1 data from 166 and 16 samples for B. globosus and B. truncatus, respectively, showed genetically diverse populations within the two species. Twelve cox1 haplotypes were found from the 166 B. globosus samples and three from the 16 B. truncatus samples with phylogenetic analysis showing that the haplotypes fall into well-supported clusters within their species groups. Both B. truncatus and B. globosus clustered into two distinct lineages. Overall, significant negative values for both Tajima’s D statistic and the Fu’s Fs statistic were observed for B. globosus and B. truncatus. Conclusions The study provided new insights into the levels of genetic diversity within B. globosus and additional information on B. truncatus collected from a small geographical area in Zimbabwe. Low prevalence levels of infection observed in the snails may reflect the low transmission level of urogenital schistosomiasis in the area. Our results contribute towards the understanding of the distribution and population genetic structure of Bulinus spp. supporting the mapping of the transmission or risk of transmission of urogenital schistosomiasis, particularly in Zimbabwe.

Endemicity, focality and seasonality of transmission of human schistosomiasis in Amagunze Village, eastern Nigeria

1989 ◽  
Vol 63 (3) ◽  
pp. 206-212 ◽  
Author(s):  
N. A. Ozumba ◽  
N. Ø. Christensen ◽  
A. B. C. Nwosu ◽  
O. C. Nwaorgu
Keyword(s):  
Population Density ◽  
Schistosoma Haematobium ◽  
Geometric Mean ◽  
Intensity Of Infection ◽  
Biomphalaria Pfeifferi ◽  
Water Contact ◽  
Bulinus Truncatus ◽  
Contact Sites ◽  
Human Schistosomiasis ◽  
Dry Seasons

ABSTRACTThe pattern of transmission of human schistosomiasis was studied in Amagunze Village, eastern Nigeria, during 1986–1987. The prevalence of Schistosoma haematobium in 119 schoolboys aged 5–12 years was 79%. The geometric mean of intensity of infection was 49 eggs/10 ml urine and the frequency of visible haematuria was 25·2%. No S. mansoni infections were demonstrated. A marked seasonality in population density of Bulinus truncatus, B. forskalii and Biomphalaria pfeifferi was demonstrated with reduced densities during the late rainy and early dry seasons. Schistosoma sp. infected B. truncatus were found in the late dry and early rainy seasons in 2 out of 7 major human water contact sites studied. Seasonality and focality of transmission of S. haematobium and its high endemicity in the area were thus demonstrated.

scholarly journals Toxoplasma gondii in Sheep and Goats from Central Iran

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Mojtaba Bahreh ◽  
Bahador Hajimohammadi ◽  
Gilda Eslami
Keyword(s):  
Toxoplasma Gondii ◽  
Dna Extraction ◽  
Infection Rate ◽  
Nested Pcr ◽  
Prevention Programs ◽  
Central Iran ◽  
Infection Rates ◽  
Sheep And Goats ◽  
One Year ◽  
Undercooked Meat

Abstract Objective Toxoplasmosis, caused by Toxoplasma gondii, infects humans by consuming infected raw or undercooked meat and foods harboring mature oocysts. In this study, we assessed the prevalence of T. gondii in sheep and goats coming from central Iran. After completing the questionnaire, about one gram of liver or diaphragm tissue was taken as a sample from 90 sheep and 90 goats slaughtered in Yazd Province and stored at – 20 ºC. DNA extraction was done, and then T. gondii was detected using nested PCR. Results This study indicated that the prevalence of T. gondii in all slaughtered animals was 11.6% (21 of 180), including 14.4% (13/90) in sheep and 8.8% (8/90) in goats. The infection rates in liver and diaphragm samples were 12.2% (11/90) and 11.1% (10/90), respectively (p = 0.8163). The infection rate in animals older than one was 16.3% (15/92), and it was 6.8% (6/88) in animals under one year of age. Therefore, no significant differences were found (p = 0.475). Infection rates were 19.5% (18/92) in males and 3.4% (3/88) in females (p = 0.0007). In conclusion, the infection rates of toxoplasmosis in livestock in this area are almost high, and therefore, it is necessary to design appropriate prevention programs to control the disease.

The cercarial output from three Nigerian bulinids infected with two strains of Schistosoma haematobium

1988 ◽  
Vol 62 (2) ◽  
pp. 133-140 ◽  
Author(s):  
S. E. Fryer ◽  
A. J. Probert
Keyword(s):  
Schistosoma Haematobium ◽  
Daily Production ◽  
Bulinus Truncatus ◽  
Low Levels ◽  
Host Parasite ◽  
Second Period ◽  
Initial Peak

ABSTRACTThe daily cercarial output of two Nigerian strains of Schistosoma haematobium in sympatric Bulinus truncatus, B. globosus and B. senegalensis was measured at weekly intervals from the start of emission to the snails' death. In all cases cercariae were released throughout the life of the host, with no cases of “self cure”. Patterns of output through the course of infections in B. truncatus and B. senegalensis were similar to those reported for S. haematobium by other workers, with daily production of cercariae rising to a peak within a few weeks of the onset of shedding, then declining until the host's death. In the longer lived B. globosus production was significantly higher, but declined to very low levels after the initial peak; in some individuals cercarial output remained very low, while others showed a second period of high cercarial emission. The relative compatibility of each host-parasite combination is discussed.

scholarly journals Biological and environmental factors associated with risk of schistosomiasis mansoni transmission in Porto de Galinhas, Pernambuco State, Brazil

2013 ◽  
Vol 29 (2) ◽  
pp. 357-367 ◽  
Author(s):  
Onicio Batista Leal Neto ◽  
Elainne Christine de Souza Gomes ◽  
Fernando José Moreira de Oliveira Junior ◽  
Rafael Andrade ◽  
Diego Leandro Reis ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Infection Rate ◽  
Breeding Site ◽  
Transmission Risk ◽  
Host Snail ◽  
Breeding Sites ◽  
Positive Correlation ◽  
Snail Density ◽  
One Year ◽  
Transmission Foci

Schistosomiasis has expanded to the coast of Pernambuco State, Brazil, where there are frequent reports of Biomphalaria glabrata snails and human cases of the disease. This study analyzes factors related to schistosomiasis transmission risk in Porto de Galinhas. A one-year malacological survey was conducted to identify biological, abiotic, and environmental factors related to the host snail breeding sites. Data analysis used Excel 2010, GTM Pro, and ArcGis 10. A total of 11,012 B. glabrata snails were captured in 36 breeding sites, and 11 schistosomiasis transmission foci were identified. A negative correlation was found between breeding site temperature and snail density and infection rate, and a positive correlation with pH and salinity. The rainy season showed a positive correlation with snail density and infection rate. The study emphasizes the factors involved in the maintenance of schistosomiasis breeding sites, in light of persistence of this disease in Porto de Galinhas for more than 10 years.

Real-Time Indicators of Vehicle Kilometers of Travel and Congestion: One Year of Experience

2000 ◽  
Vol 1719 (1) ◽  
pp. 209-214
Author(s):  
Ho-Ling Hwang ◽  
David L. Greene ◽  
Shih-Miao Chin ◽  
Angela A. Gibson
Keyword(s):  
Missing Data ◽  
National Laboratory ◽  
Experimental System ◽  
Automated System ◽  
The Internet ◽  
Seasonal Patterns ◽  
Traffic Data ◽  
Oak Ridge ◽  
Direct Measurements ◽  
One Year

Automated traffic data posted on the Internet by four cities have been continuously downloaded, processed, and archived for more than 1 year by an automated system developed by Oak Ridge National Laboratory and funded by the U.S. Bureau of Transportation Statistics. Although the experimental system is far from national in scale and scope, it has shown that automated collection and processing of local traffic data via the Internet for national purposes is feasible and practical. Strong seasonal patterns make it too early to estimate statistical models of traffic growth, but comparisons of the same months in 1998 and 1999 indicate changes ranging from 1 percent to 3 percent for the monitored systems. Direct measurements of delay on the monitored systems are lower than published estimates for previous years. Although some progress in the input of missing data has been made, missing data are still a major problem, and better methods are needed.

scholarly journals Analysis of reproductive biology and spawning season of the pink ear emperor Lethrinus lentjan, from marine ecosystem

2020 ◽  
Vol 37 ◽  
pp. 1-10
Author(s):  
Elsayed M. Younis ◽  
Nasser A. Al-Asgah ◽  
Abdel-Wahab A. Abdel-Warith ◽  
Mohamed H. Gabr ◽  
Fozi S. Shamlol
Keyword(s):  
Fish Species ◽  
Gonadosomatic Index ◽  
Marine Ecosystem ◽  
Local Population ◽  
Spawning Season ◽  
Monthly Basis ◽  
Population Sampling ◽  
Maturation Rate ◽  
Maturation Index ◽  
One Year

A total of 593 samples of Lethrinus lentjan (Lacepede, 1802) were collected from the Red Sea, Jeddah, Saudi Arabia, to study their productive biology and spawning season of the local population. Sampling was carried out on a monthly basis for a period of one year. The monthly sex ratios indicated that females were dominant throughout the study period, with an overall male:female sex ratio of 1:7.98, although males were larger than females. The highest monthly performance maturation index (PMI), as well as the male and female gonadosomatic index (GSI) and ovarian maturation rate (OMR) were observed in February and March. Histological examination of the gonads confirmed the process of sexual transformation in this fish species, wherein individuals mature first as female, and then change sex to male (protogynous hermaphroditism). Histological sections also showed that the sexual maturation of males of L. lenjtan comprised three main stages, while the sexual development of females could be classified into four main stages. Extended spawning in the form of batches released during different months throughout the year were recorded for this fish species, with the main spawning season in February and March, and an additional, shorter spawning season in September.

scholarly journals ANALISIS KINERJA PENURUNAN DEFORESTASI DI 10 IZIN HUTAN DESA KECAMATAN BATU AMPAR

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Denni Nurdwiansyah ◽  
Gusti Hardiansyah ◽  
Emi Roslinda
Keyword(s):  
Survey Method ◽  
Social Forestry ◽  
Improve Performance ◽  
Deforestation Rates ◽  
Long Run ◽  
The Social ◽  
And Performance ◽  
One Year ◽  
The Village ◽  
Forestry Programs

The effectiveness of devolution policies through social forestry programs in village forest schemes is still being debated at regional, national, and international levels. It departs from the fact that the community has limited resources in managing forests in the long run (35 years). The background of this research is to measure the implementation of devolution policy in 10 granted village forest licenses in the sub-district of Batu Ampar, Kubu Raya District, and its relationship with deforestation rates. The study was conducted by survey method and data collection with literature studies and observations. Observation aims to measure the biophysical condition of the forest as well as the social and economic conditions of the community in the village. The data is processed and analyzed using spatial analysis and performance analysis. The results showed that the devolution policy through the issuance of 10 village forest licenses was proven to be able to improve performance in reducing deforestation, especially after one year of the village forest permits were granted. Keywords: devolution, social forestry, village forest, deforestation, performance AbstrakEfektifitas kebijakan devolusi melalui program perhutanan sosial skema hutan desa masih menjadi perdebatan di level regional, nasional, dan internasional. Hal ini berangkat dari fakta keterbatasan sumber daya yang dimiliki masyarakat dalam mengelola hutan dalam jangka waktu panjang (35 tahun). Penelitian bertujuan untuk mengurai implementasi kebijakan devolusi di 10 izin hutan desa Kecamatan Batu Ampar, Kabupaten Kubu Raya, dan pengaruhnya terhadap laju deforestasi. Penelitian dilakukan dengan metode survei. Pengumpulan data dengan studi literatur dan observasi. Observasi bertujuan untuk mengetahui kondisi biofisik hutan serta kondisi sosial dan ekonomi masyarakat di desa. Data-data diolah dan dianalisis menggunakan analisis spasial dan analisis kinerja. Hasil penelitian menunjukan kebijakan devolusi melalui pemberian 10 izin hutan desa telah terbukti secara kumulatif mampu meningkatkan kinerja positif dalam penurunan deforestasi, terutama setelah satu tahun izin hutan desa diberikan.Kata kunci: devolusi, perhutanan sosial, hutan desa, deforestasi, kinerja

scholarly journals Impact of seven years of mass drug administration and recrudescence of Schistosoma haematobium infections after one year of treatment gap in Zanzibar: Repeated cross-sectional studies

2021 ◽  
Vol 15 (2) ◽  
pp. e0009127
Author(s):  
Lydia Trippler ◽  
Shaali Makame Ame ◽  
Jan Hattendorf ◽  
Saleh Juma ◽  
Salum Abubakar ◽  
...  
Keyword(s):  
Drug Administration ◽  
Mass Drug Administration ◽  
Odds Ratio ◽  
Schistosoma Haematobium ◽  
Treatment Gap ◽  
Urogenital Schistosomiasis ◽  
Cross Sectional ◽  
Reagent Strips ◽  
One Year ◽  
Low Prevalence

Background Considerable progress towards the elimination of urogenital schistosomiasis was made by the Zanzibar Elimination of Schistosomiasis Transmission project from 2012 till 2016, when biannual praziquantel mass drug administration (MDA) alone or with additional snail control or behaviour change interventions were implemented. Annual MDA was continued in 2017 and 2018, but not in 2019, imposing a 16-month treatment gap. We monitored the Schistosoma haematobium prevalence from 2012 till 2020 and assessed recrudescence patterns with focus on 2020. Methodology Repeated cross-sectional surveys were conducted from 2011/12 till 2020 in 90 communities and 90 schools in Zanzibar. Annually, around 4,500 adults and up to 20,000 schoolchildren were surveyed. The S. haematobium prevalence was detected by urine filtration and reagent strips. In 2020, risk factors for infection were investigated using generalized estimated equation models. Principal findings In adults, the apparent S. haematobium prevalence was 3.9% in 2011 and 0.4% in 2020. In schoolchildren, the prevalence decreased from 6.6% in 2012 to 1.2% in 2019 with vicissitudes over the years. Prominent recrudescence of infection from 2.8% in 2019 to 9.1% (+225%) in 2020 was observed in 29 schools with historically moderate prevalences (≥10%). Compared with 2019, reinfection in 2020 was particularly striking in boys aged 9–16 years. Being male was a risk factor for infection in 2020 (adults: odds ratio (OR): 6.24, 95% confidence interval (95% CI): 1.96–19.60; schoolchildren: OR: 2.06, 95% CI: 1.52–2.78). Living near to a natural freshwater body significantly increased the odds of infection in adults (OR: 2.90, CI: 1.12–7.54). Conclusions/Significance After 11 rounds of MDA over 7 years and a 16-month treatment gap, the urogenital schistosomiasis prevalence considerably rebounded in hotspot areas. Future elimination efforts in Zanzibar should focus on re-intensifying MDA plus additional interventions in hotspot areas. In low-prevalence areas, the strategy might be adapted from MDA to targeted surveillance-response.

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