Mapping the probability of detecting Burkholderia pseudomallei in rural rice paddy soil based on indicator kriging and spatial soil factor analysis

Abstract Background Melioidosis is an infectious disease commonly found in Thailand. This infectious disease is caused by Burkholderia pseudomallei in soil. This study aims to analyze the association between spatial soil factors and B. pseudomallei detection, as well as to map the probability of B. pseudomallei contamination based on indicator kriging in paddy soil. Methods Seventy-eight soil samples were collected randomly on 22 April 2018 in various paddy fields. Oxidase, Gram staining and monoclonal antibody-based latex agglutination assays were performed to confirm the presence of B. pseudomallei in soil samples. The association between B. pseudomallei detection and spatial soil factors including soil temperature, soil pH, soil texture and soil drainage were analyzed by the Mann–Whitney U test and χ2 test. Subsequently, a semivariogram model and indicator kriging were used to map the probability of B. pseudomallei contamination. Results Of the 78 samples, B. pseudomallei was detected in 32 (41.03%). The presence or absence of B. pseudomallei was not significantly associated with spatial soil factors. The semivariogram model showed that the lag distance between positive B. pseudomallei samples was 90.51 m. Conclusion The empirical semivariogram and indicator kriging are an alternative option for predicting the spatial distribution of B. pseudomallei in soil.

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Prevalence of Burkholderia pseudomallei in Guangxi, China

Epidemiology and Infection ◽

10.1017/s0950268809990264 ◽

2009 ◽

Vol 138 (1) ◽

pp. 37-39 ◽

Cited By ~ 17

Author(s):

G. MA ◽

D. ZHENG ◽

Q. CAI ◽

Z. YUAN

Keyword(s):

Water Samples ◽

Burkholderia Pseudomallei ◽

Public Health Problem ◽

Rice Paddy ◽

Soil Samples ◽

Important Public Health Problem ◽

Water And Soil Samples ◽

Species Specific ◽

The Impact ◽

Rice Paddy Fields

SUMMARYMelioidosis, an infectious disease caused by the Gram-negative bacterium Burkholderia pseudomallei, is now recognized as an important public health problem in Southeast Asia and tropical northern Australia. Although B. pseudomallei has been detected in various water and soil samples in southeast China, the enviromental distribution of B. pseudomallei in China is unclear. In the winter months of 2007, 154 and 130 soil and water samples, respectively, were collected from several locations in Guangxi, China. The samples were screened for B. pseudomallei by bacterial culture and identification and confirmed by PCR for species-specific 16S rDNA and flagellin genes. B. pseudomallei was detected in 8·4% of the soil samples but in none of the water samples. All positive samples were confined to a single low-lying region from rice paddy fields. Counts of B. pseudomallei ranged from 23 to 521 c.f.u./g soil. This is the first geographical distribution survey of B. pseudomallei in soil in Guangxi, China, and the data are of importance for further evaluating the impact of this pathogen on melioidosis in this region.

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Analyses of the Distribution Patterns of Burkholderia pseudomallei and Associated Phages in Soil Samples in Thailand Suggest That Phage Presence Reduces the Frequency of Bacterial Isolation

PLoS Neglected Tropical Diseases ◽

10.1371/journal.pntd.0005005 ◽

2016 ◽

Vol 10 (9) ◽

pp. e0005005 ◽

Cited By ~ 6

Author(s):

Patoo Withatanung ◽

Narisara Chantratita ◽

Veerachat Muangsombut ◽

Natnaree Saiprom ◽

Ganjana Lertmemongkolchai ◽

...

Keyword(s):

Burkholderia Pseudomallei ◽

Distribution Patterns ◽

Soil Samples ◽

Bacterial Isolation

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Water-washed hydrochar in rice paddy soil reduces N2O and CH4 emissions: A whole growth period investigation

Environmental Pollution ◽

10.1016/j.envpol.2021.116573 ◽

2021 ◽

Vol 274 ◽

pp. 116573

Author(s):

Danyan Chen ◽

Yibo Zhou ◽

Cong Xu ◽

Xinyu Lu ◽

Yang Liu ◽

...

Keyword(s):

Paddy Soil ◽

Growth Period ◽

Rice Paddy ◽

Rice Paddy Soil ◽

Ch4 Emissions

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Inhibition of methanogenesis leads to accumulation of methylated arsenic species and enhances arsenic volatilization from rice paddy soil

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.151696 ◽

2021 ◽

pp. 151696

Author(s):

Xuhui Zhang ◽

Matthew C. Reid

Keyword(s):

Paddy Soil ◽

Arsenic Species ◽

Rice Paddy ◽

Rice Paddy Soil

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Mercury methylation in paddy soil: source and distribution of mercury species at a Hg mining area, Guizhou Province, China

Biogeosciences ◽

10.5194/bg-13-2429-2016 ◽

2016 ◽

Vol 13 (8) ◽

pp. 2429-2440 ◽

Cited By ~ 34

Author(s):

Lei Zhao ◽

Christopher W. N Anderson ◽

Guangle Qiu ◽

Bo Meng ◽

Dingyong Wang ◽

...

Keyword(s):

Paddy Soil ◽

Surface Soil ◽

Ambient Air ◽

Rice Paddy ◽

Guizhou Province ◽

Mercury Species ◽

Low Concentration ◽

Paddy Water ◽

Hg Mining

Abstract. Rice paddy plantation is the dominant agricultural land use throughout Asia. Rice paddy fields have been identified as important sites for methylmercury (MeHg) production in the terrestrial ecosystem and a primary pathway of MeHg exposure to humans in mercury (Hg) mining areas. We compared the source and distribution of Hg species in different compartments of the rice paddy during a complete rice-growing season at two different typical Hg-contaminated mining sites in Guizhou province, China: an abandoned site with a high Hg concentration in soil but a low concentration in the atmosphere and a current-day artisanal site with a low concentration in soil but a high concentration in the atmosphere. Our results showed that the flux of new Hg to the ecosystem from irrigation and atmospheric deposition was insignificant relative to the pool of old Hg in soil; the dominant source of MeHg to paddy soil is in situ methylation of inorganic Hg (IHg). Elevated MeHg concentrations and the high proportion of Hg as MeHg in paddy water and the surface soil layer at the artisanal site demonstrated active Hg methylation at this site only. We propose that the in situ production of MeHg in paddy water and surface soil is dependent on elevated Hg in the atmosphere and the consequential deposition of new Hg into a low-pH anoxic geochemical system. The absence of depth-dependent variability in the MeHg concentration in soil cores collected from the abandoned Hg mining site, consistent with the low concentration of Hg in the atmosphere and high pH of the paddy water and irrigation water, suggested that net production of MeHg at this site was limited. We propose that the concentration of Hg in ambient air is an indicator for the risk of MeHg accumulation in paddy rice.

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Presence and Health Risks of Obsolete and Emerging Pesticides in Paddy Rice and Soil from Thailand and China

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17113786 ◽

2020 ◽

Vol 17 (11) ◽

pp. 3786

Author(s):

Naranun Khammanee ◽

Yanling Qiu ◽

Nipapun Kungskulniti ◽

Anders Bignert ◽

Yuan Meng ◽

...

Keyword(s):

Health Risks ◽

Organophosphorus Pesticides ◽

Relative Concentration ◽

Rice Paddy ◽

Soil Samples ◽

Paddy Rice ◽

The European Union ◽

Pest Infestation ◽

Detection Frequency ◽

Significant Difference

Organochlorine (OCPs) and organophosphorus pesticides (OPPs) have been intensively applied in rice paddy field farming to control pest infestation and increase the yield. In this study, we investigated the presence of organochlorine and organophosphorus pesticides in paddy rice and soil from rice plantations in Thailand and China. According to concentration and distribution of OCPs, the most abundant OCPs residues in rice and soil from Thailand and China were dichlorodiphenyltrichloroethane and hexachlorocyclohexanes. The OPPs of methidathion, carbophenothion, chlorpyrifos, and diazinon were common to Thailand and China in both types of samples. The detection frequency of multiple types of these pesticides was greater than 50% of total samples. The relative concentration of some OPPs residues in rice and soil from Thailand and China were significantly different from each other (p < 0.0083), whereas, no significant difference was observed for the relative concentration of OCPs residues in rice and soil from both countries, except for HCHs (p < 0.05). Bioaccumulation factors of OCPs between rice and soil samples indicated that OCPs and OPPs in soil could accumulate in rice. The carcinogenic and non- carcinogenic risks of OCPs and OPPs seem to be in the safe range as recommended by the European Union.

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The rise and fall of epidemic Neisseria meningitidis from a tertiary care hospital in Delhi, January 2005–June 2007

Tropical Doctor ◽

10.1258/td.2007.070296 ◽

2008 ◽

Vol 38 (4) ◽

pp. 222-224 ◽

Cited By ~ 4

Author(s):

Surinder Kumar ◽

Bineeta Kashyap ◽

Preena Bhalla

Keyword(s):

Neisseria Meningitidis ◽

Tertiary Care Hospital ◽

Tertiary Care ◽

Latex Agglutination ◽

Meningococcal Meningitis ◽

Agglutination Test ◽

Latex Agglutination Test ◽

Care Hospital ◽

Gram Staining ◽

Health Goals

Meningococcal meningitis is endemic in India. There has been a sudden surge of cases of meningococcal meningitis in 2005 in Delhi. Present study was undertaken to find out changing trends in incidence of this disease from a tertiary care hospital in New Delhi over a period of two and half years. All samples from suspected cases of meningococcal meningitis were subjected to Gram staining, culture and latex agglutination test for detection of Neisseria meningitidis ( N.meningitidis). Antimicrobial susceptibility of all isolates was performed using the disc diffusion test. 78.6%, 71.4% and 100% of the samples were positive for N.meningitidis by smear examination, culture and latex agglutination test respectively. Except for resistance to Penicillin and Erythromycin in 8.8% and 5.9%, the isolates were sensitive to the commonly used antibiotics. Using simple, rapid and reliable methods for diagnosis, defining risk factors and continuing surveillance remain important public health goals for the control of meningococcal disease.

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