Identification of Potential High-Risk Habitats within the Transmission Reach of Oncomelania hupensis after Floods Based on SAR Techniques in a Plane Region in China

Shi, Yuanyuan; Qiu, Juan; Li, Rendong; Shen, Qiang; Huang, Duan

doi:10.3390/ijerph14090986

Cited by 17 publications

(18 citation statements)

References 55 publications

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“…hupensis quadrasi is the most amphibious and can be seen on soil, buried in mud, clinging to leaf and stalks of surrounding vegetation or even submerged underwater [5,35–37]. The amphibious property of the snail and its frequent interaction with freshwater makes it susceptible to dispersal from intense water flow most especially during flooding [38]. Newly formed waterlogged bodies in endemic areas may serve as new snail breeding sites for dispersed populations of snails after flooding [39].…”

Section: Discussionmentioning

confidence: 99%

Detection of Schistosoma japonicum and Oncomelania hupensis quadrasi environmental DNA and its potential utility to schistosomiasis japonica surveillance in the Philippines

et al. 2019

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In recent years, the prevalence and infection intensity of Schistosoma japonicum in endemic areas of the Philippines have significantly decreased due to yearly population-based treatment strategies, yet transmission rates remain high and uninterrupted. An important indicator of active disease transmission is the presence of Schistosoma japonicum and its snail intermediate host Oncomelania hupensis quadrasi in freshwater habitats. In this study, we sought to apply a species-specific real-time PCR (qPCR) assay for the detection of S. japonicum and O. hupensis quadrasi in freshwater samples using environmental DNA approach that can complement the commonly utilized malacological survey in determining potential transmission foci in order to have a more effective snail surveillance strategy for schistosomiasis japonica in endemic areas. The newly developed assay was specific to S. japonicum and O. hupensis quadrasi with no amplification detected against non-target trematode Fasciola spp. and snails such as Lymnaea spp., Pomacea canaliculata, and Melanoides spp. that typically co-exist in the same environment. The assay effectiveness was determined using 19 environmental water samples collected from Northern Samar (N = 5 sites), Leyte (N = 11 sites) and Compostela Valley (N = 3 sites) and compared to malacological survey for determining O. hupensis quadrasi snail colonies and snail crushing to visualize S. japonicum cercariae. TaqMan qPCR targeting a short fragment of the cytochrome c oxidase subunit 1 (cox1) gene was positive for S. japonicum in 9 sites, for O. hupensis quadrasi in 9 sites, and for both S. japonicum and O. hupensis quadrasi in 5 sampling sites. Moreover, it was able to detect O. hupensis quadrasi in 3 out of 12 sites found negative and 6 out of 7 sites found positive through malacological survey, and in 4 of the 5 snail sites positive for snails with cercariae. Overall, this method can complement malacological surveys for monitoring of schistosomes in endemic areas of the Philippines, especially those with high risk of human infection.

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Section: Discussionmentioning

confidence: 99%

Detection of Schistosoma japonicum and Oncomelania hupensis quadrasi environmental DNA and its potential utility to schistosomiasis japonica surveillance in the Philippines

et al. 2019

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“…Remote sensing image data has been widely employed for the surveillance schistosomiasis and intermediate host snails habitats [26][27][28][29]. Satellite-based remote sensing collects ecological and geographical data, such as land coverage, vegetation, soil type, surface moisture and rainfall, which may be used to monitor environmental changes, thereby assessing the suitability of snail breeding habitats of association potential of schistosomiasis transmission [30][31][32].…”

Section: Discussionmentioning

confidence: 99%

Potential Impact of Flood on Schistosomiasis in Poyang Lake Regions Based on Multi-Source Remote Sensing Images

Xue¹,

Wang²,

Zhang³

et al. 2020

Preprint

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BackgroundFlooding may be the most important factors contributing to the rebound of Oncomelania hupensis in endemic foci. This study aimed to assess the risk of schistosomiasis japonica transmission impacted by flooding around the Poyang Lake region using multi-source remote sensing images.MethodsNormalized Difference Vegetation Index (NDVI) data collected by the Landsat 8 satellite was used as an ecological and geographical suitability indicator of O. hupensis snail habitats in the Poyang Lake region. The flood-affected water body expansion was estimated using dual polarized threshold calculations based on the dual polarized synthetic aperture radar (SAR). The image data were captured from Sentinel-1B satellite in May 2020 before the flood and in July 2020 during the flood. The spatial database of snail habitats distribution was created by using the 2016 snail survey in Jiangxi Province. The potential spread of O. hupensis snails after the flood was predicted by an overlay analysis of the NDVI maps of flood-affected water body areas. In addition, the risk of schistosomiasis transmission was classified based on O. hupensis snail density data and the related NDVI. ResultsThe surface area of Poyang Lake was approximately 2,207 km2 in May 2020 before the flood and 4,403 km2 in July 2020 during the period of the flood peak, and the flood-caused expansion of water body was estimated as 99.5%. After the flood, the potential snail habitats were predicted to be concentrated in areas neighboring the existing habitats in marshlands of the Poyang Lake. The areas with high risk of schistosomiasis transmission were predicted to be mainly distributed in Yongxiu, Xinjian, Yugan and Poyang (District) along Poyang Lake. By comparing the predictive results and actual snail distribution, the predictive accuracy of the model was estimated as 87%, which meant the 87% of actual snail distribution were correctly identified as the snail habitats in the model predictions. ConclusionsFlood-affected water body expansion and environmental factors pertaining to snail breeding may be rapidly extracted from Landsat 8 and Sentinel-1B remote sensing images. The applications of multi-source remote sensing data are feasible for the timely and effective assessment of the potential schistosomiasis transmission risk caused by snail spread during the flood disaster, which is of great significance for precision control of schistosomiasis.

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“…. anjir memiliki peranan dal am menyebarkan keong perantara, sedangkan 15 tanah longsor bisa menyebabkan fokus keong tertimbun oleh bahan material yang menyebabkan keong t e r t u t u p d a l a m t a n a h . 1 6 S t u d i l a i n menunjukkan bahwa ada korelasi antara distribusi keong dan curah hujan.…”

Section: Pembahasanunclassified

“…Daerah basah dan areal 12,15 pertanian menjadi tempat yang paling banyak ditemukan habitat keong. Panjang parit dan 18 kondisi tanah yang liat juga sangat berkorelasi dengan keberadaan keong perantara.…”

Section: Pembahasanunclassified

“…Panjang parit dan 18 kondisi tanah yang liat juga sangat berkorelasi dengan keberadaan keong perantara. 15 Keberadaan habitat keong di areal pertanian dan saluran air serta dekat dengan pemukiman penduduk bisa meningkatkan r i s i k o m a n u s i a u n t u k t e r k e n a s c h i s to s o s m i a s i s . S t u d i s eb e l u m nya m e n g u n g k a p k a n b a h w a p r e v a l e n s i schistosomiasis relatif tinggi pada penduduk yang rumahnya terletak di sekitar habitat keong .…”

Section: Pembahasanunclassified

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Pemetaan Keong Fokus Oncomelania hupensis lindoensis di Empat Desa Schistosomiasis di Kabupaten Sigi dan Poso

Pawakkangi

Maksud

Mujiyanto

et al. 2018

vektorp

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Abstract The habitat of Oncomelania hupensis lindoensis snails was found widely spread in the three areas of the Napu, Bada and Lindu Highlands with the infection rate above 1%. The last focus distribution map of this snail was done eight years ago. Therefore, it needs to be updated. This study aimed to identify and map the primary and secondary foci area of O.hupensis lindoensis snail. Mapping of the intermediate host of schistosoma, O. hupensis lindoensis was conducted for seven month in four schistosomiasis endemic villages in Poso and Sigi District of Central Sulawesi in 2016. The result showed that snail of O. hupensis lindoensis in Sedoa was found reduced to 33 foci, in Watutau Village was also reduced to two foci, in Tomehipi Village was found increased become eight foci, and in Tomado Village was found reduced become 15 foci. The foci areas needs to be changed into agricultural land, to reduce the number and area of O. hupensis lindoensis. Abstrak Penyebaran habitat keong O. hupensis lindoensis ditemukan di tiga wilayah yaitu Dataran Tinggi Napu, Bada dan Lindu dengan infection rate di atas 1%. Data distribusi fokus telah dilakukan delapan tahun lalu melalui pemetaan fokus, sehingga perlu diperbaharui. Telah dilakukan pemetaan habitat perantara schistosomiasis keong O. hupensis lindoensis selama tujuh bulan di empat daerah endemis di Kabupaten Poso dan Sigi Sulawesi Tengah. Studi ini bertujuan memetakan dan mengidentifikasi fokus keong O. hupensis lindoensis di dataran tinggi Napu, Bada, dan Lindu, sebagai pembaharuan data perkembangan fokus di daerah endemis. Hasil pemetaan habitat hospes perantara schistosomiasis keong O. hupensis lindoensis menunjukan bahwa jumlah fokus keong O. hupensis lindoensis di Desa Sedoa menurun menjadi 33 fokus, di Desa Watutau jumlah fokus menurun menjadi dua fokus, di Desa Tomehipi meningkat menjadi delapan fokus, dan di Desa Tomado menurun menjadi 15 fokus. Aktivitas pengelolaan area fokus menjadi lahan produktif perlu diintensifkan guna mengurangi jumlah fokus O. hupensis lindoensis.

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Identification of Potential High-Risk Habitats within the Transmission Reach of Oncomelania hupensis after Floods Based on SAR Techniques in a Plane Region in China

Cited by 17 publications

References 55 publications

Detection of Schistosoma japonicum and Oncomelania hupensis quadrasi environmental DNA and its potential utility to schistosomiasis japonica surveillance in the Philippines

Detection of Schistosoma japonicum and Oncomelania hupensis quadrasi environmental DNA and its potential utility to schistosomiasis japonica surveillance in the Philippines

Potential Impact of Flood on Schistosomiasis in Poyang Lake Regions Based on Multi-Source Remote Sensing Images

Pemetaan Keong Fokus Oncomelania hupensis lindoensis di Empat Desa Schistosomiasis di Kabupaten Sigi dan Poso

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