1
|
DeWeerdt S. Could rats and dogs detect disease better than the finest lab equipment? Nature 2024:10.1038/d41586-024-01751-9. [PMID: 38898249 DOI: 10.1038/d41586-024-01751-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
|
2
|
Agizew TB, Soka J, Fast CD, Mwimanzi S, Mwesiga G, Edward N, Stephen M, Kondo R, Burny R, Cox C, Beyene N. Increased tuberculosis case detection in Tanzanian children and adults using African giant pouched rats. BMC Infect Dis 2024; 24:401. [PMID: 38622527 PMCID: PMC11017552 DOI: 10.1186/s12879-024-09313-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 04/10/2024] [Indexed: 04/17/2024] Open
Abstract
BACKGROUND African giant pouched rats, trained by Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), have demonstrated their ability to detect tuberculosis (TB) from sputum. We assessed rat-based case detection and compared the mycobacterium bacillary load (MTB-load) in children versus adults. METHODS From January-December 2022, samples were collected prospectively from 69 Directly Observed Therapy (DOT) facilities' presumed TB patients. Using an average of five rats, APOPO re-evaluated patients with bacteriologically negative (sputum-smear microscopy or Xpert MTB/RIF) results. Rat-positive samples were tested using concentrated smear light-emitting diode microscopy to confirm TB detection before treatment initiation. The rats' identification of pulmonary TB is based on smelling TB-specific volatile organic compounds (VOCs) in sputum. Using STATA, Chi-square for odds ratio and confidence interval was calculated and evaluated: (1) the yield of rat-based TB detection compared to that of the health facilities; (2) rat-based TB detection in children versus adults; and (3) rats' ability to detect TB across MTB-loads and between children and adults. RESULTS From 35,766 patients, 5.3% (1900/35,766) were smear-positive and 94.7% (33,866/35,766) were smear or Xpert-negatives at DOTS facility. Of those with negative results, 2029 TB cases were detected using rats, contributing to 52% (2029/3929 of total TB identified), which otherwise would have been missed. Compared to DOT facilities, rats were six-fold more likely to detect TB among Acid Fast Bacilli (AFB) 1+/scanty [90% (1829/2029) versus 60% (1139/1900), odds ratio, OR = 6.11, 95% confidence interval, CI: 5.14-7.26]; twice more likely to identify TB cases among children [71% (91/129) versus 51% (1795/3542), OR = 2.3, 95% CI: 1.59-3.42]; and twice more likely to identify TB cases among children with AFB 1+/scanty than adults with the same MTB-load [5% (86/1703) versus 3% (28/1067), OR = 2.0, 95% CI: 1.28-3.03]. CONCLUSIONS Rats contributed over half of the TB cases identified in program settings, and children, especially those with a lower MTB-load, were more likely to be diagnosed with TB by rats. The chemical signatures, VOCs, were only available for adults, and further research describing the characteristics of VOCs in children versus adults may pave the way to enhance TB diagnosis in children.
Collapse
Affiliation(s)
- Tefera B Agizew
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania.
- Department of Biology, University of Antwerp, Antwerp, Belgium.
| | - Joseph Soka
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Cynthia D Fast
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Stephen Mwimanzi
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Gilbert Mwesiga
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Nashon Edward
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Marygiven Stephen
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Reheme Kondo
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Robert Burny
- APOPO, TB Detection Program, Eduardo Mondlane University, Maputo, Mozambique
| | - Christophe Cox
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Negussie Beyene
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO) Tuberculosis Department, Sokoine University of Agriculture, Morogoro, Tanzania
- Department of Biology, University of Antwerp, Antwerp, Belgium
- APOPO TB Research Project, Armauer Hansen Research Institute, Addis Ababa, Ethiopia
| |
Collapse
|
3
|
Determination of tuberculosis-related volatile organic biomarker methyl nicotinate in vapor using fluorescent assay based on quantum dots and cobalt-containing porphyrin nanosheets. Mikrochim Acta 2022; 189:108. [PMID: 35171382 DOI: 10.1007/s00604-022-05212-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 01/31/2022] [Indexed: 10/19/2022]
Abstract
Methyl nicotinate (MN) is a representative and typical volatile organic marker of Mycobacterium tuberculosis, and the specific detection of MN in human breath facilitates non-invasive, rapid, and accurate epidemic screening of tuberculosis infection. Herein, we constructed a fluorescent assay consisted of CdTe quantum dots (QD) and cobalt-metalized tetrakis(4-carboxyphenyl) porphyrin (CoTCPP) nanosheets to determine methyl nicotinate (MN) in vapor samples. Red-emission QD (λex=370 nm, λem=658 nm) acts as signal switches whose fluorescence signals can be effectively quenched by CoTCPP nanosheets but restored in the presence of MN. The strategy relied on the distinct binding affinity of cobalt ion and MN. MN restored the fluorescence of QD quenched by CoTCPP in a concentration-dependent manner, which exhibited a well-linear relationship in the range 1-100 μM, and a limit of detection of 0.59 μM. The proposed platform showed sensitivity and selectivity to detect MN in vapor samples with satisfactory RSD below 3.33%. The method is cheap, simple, and relatively rapid (detected within 4 min), which suggests a potential in tuberculosis diagnosis in resource- and professional-lacked areas.
Collapse
|
4
|
Millet P, Martin T, Opiekun M, Beauchamp GK, Kimball BA. Differing Alterations of Odor Volatiles Among Pathogenic Stimuli. Chem Senses 2021; 46:6300881. [PMID: 34133735 DOI: 10.1093/chemse/bjab030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Alterations of the volatile metabolome (the collection of volatiles present in secretions and other emanations) that occur in response to inflammation can be detected by conspecifics and chemometric analyses. Using a model system where mouse urinary metabolites are altered by treatment with lipopolysaccharide (found in the outer cell membrane of gram-negative bacteria), we hypothesized that alteration of body odor volatiles will vary according to the pathogen responsible for inducing the inflammation. We tested this hypothesis by treating mice with different immunogens that engage different immune signaling pathways. Results suggest that alterations of body odor volatiles resulting from inflammation do contain detailed information about the type of pathogen that instigated the inflammation and these differences are not merely dependent on the severity of the inflammatory event. These results are encouraging for the future of differential medical diagnosis of febrile diseases by analysis of the volatile metabolome. In particular, our data support the possibility that bacterial infections can be differentiated from viral infections such that antibiotic drug stewardship could be drastically improved by reducing unneeded treatments with antibiotics.
Collapse
Affiliation(s)
- Patrick Millet
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA, USA
| | - Talia Martin
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA, USA
| | - Maryanne Opiekun
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA, USA
| | - Gary K Beauchamp
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA, USA
| | - Bruce A Kimball
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA, USA
| |
Collapse
|
5
|
Oh Y, Kwon O, Min SS, Shin YB, Oh MK, Kim M. Multi-Odor Discrimination by Rat Sniffing for Potential Monitoring of Lung Cancer and Diabetes. SENSORS 2021; 21:s21113696. [PMID: 34073351 PMCID: PMC8198436 DOI: 10.3390/s21113696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 11/16/2022]
Abstract
The discrimination learning of multiple odors, in which multi-odor can be associated with different responses, is important for responding quickly and accurately to changes in the external environment. However, very few studies have been done on multi-odor discrimination by animal sniffing. Herein, we report a novel multi-odor discrimination system by detection rats based on the combination of 2-Choice and Go/No-Go (GNG) tasks into a single paradigm, in which the Go response of GNG was replaced by 2-Choice, for detection of toluene and acetone, which are odor indicators of lung cancer and diabetes, respectively. Three of six trained rats reached performance criterion, in 12 consecutive successful tests within a given set or over 12 sets with a success rate of over 90%. Through a total of 1300 tests, the trained animals (N = 3) showed multi-odor sensing performance with 88% accuracy, 87% sensitivity and 90% specificity. In addition, a dependence of behavior response time on odor concentrations under given concentration conditions was observed, suggesting that the system could be used for quantitative measurements. Furthermore, the animals’ multi-odor sensing performance has lasted for 45 days, indicating long-term stability of the learned multi-odor discrimination. These findings demonstrate that multi-odor discrimination can be achieved by rat sniffing, potentially providing insight into the rapid, accurate and cost-effective multi-odor monitoring in the lung cancer and diabetes.
Collapse
Affiliation(s)
- Yunkwang Oh
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Korea
| | - Ohseok Kwon
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea;
| | - Sun-Seek Min
- Department of Physiology and Biophysics, Eulji University School of Medicine, 77 Gyeryong-ro, Jung-gu, Daejeon 34824, Korea;
| | - Yong-Beom Shin
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- KRIBB School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
| | - Min-Kyu Oh
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Korea
- Correspondence: (M.-K.O.); (M.K.); Tel.: +82-2-3290-3308 (M.-K.O.); +82-42-879-8447 (M.K.); Fax: +82-2-926-6102 (M.-K.O.); +82-42-879-8594 (M.K.)
| | - Moonil Kim
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- KRIBB School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
- Correspondence: (M.-K.O.); (M.K.); Tel.: +82-2-3290-3308 (M.-K.O.); +82-42-879-8447 (M.K.); Fax: +82-2-926-6102 (M.-K.O.); +82-42-879-8594 (M.K.)
| |
Collapse
|
6
|
Oh Y, Kwon OS, Min SS, Shin YB, Oh MK, Kim M. Olfactory Detection of Toluene by Detection Rats for Potential Screening of Lung Cancer. SENSORS 2021; 21:s21092967. [PMID: 33922694 PMCID: PMC8123061 DOI: 10.3390/s21092967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/02/2022]
Abstract
Early detection is critical to successfully eradicating a variety of cancers, so the development of a new cancer primary screening system is essential. Herein, we report an animal nose sensor system for the potential primary screening of lung cancer. To establish this, we developed an odor discrimination training device based on operant conditioning paradigms for detection of toluene, an odor indicator component of lung cancer. The rats (N = 15) were trained to jump onto a floating ledge in response to toluene-spiked breath samples. Twelve rats among 15 trained rats reached performance criterion in 12 consecutive successful tests within a given set, or over 12 sets, with a success rate of over 90%. Through a total of 1934 tests, the trained rats (N = 3) showed excellent performance for toluene detection with 82% accuracy, 83% sensitivity, 81% specificity, 80% positive predictive value (PPV) and 83% negative predictive value (NPV). The animals also acquired considerable performance for odor discrimination even in rigorous tests, validating odor specificity. Since environmental and long-term stability are important factors that can influence the sensing results, the performance of the trained rats was studied under specified temperature (20, 25, and 30 °C) and humidity (30%, 45%, and 60% RH) conditions, and monitored over a period of 45 days. At given conditions of temperature and humidity, the animal sensors showed an average accuracy within a deviation range of ±10%, indicating the excellent environmental stability of the detection rats. Surprisingly, the trained rats did not differ in retention of last odor discrimination when tested 45 days after training, denoting that the rats’ memory for trained odor is still available over a long period of time. When taken together, these results indicate that our odor discrimination training system can be useful for non-invasive breath testing and potential primary screening of lung cancer.
Collapse
Affiliation(s)
- Yunkwang Oh
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Korea
| | - Oh-Seok Kwon
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea;
| | - Sun-Seek Min
- Department of Physiology and Biophysics, Eulji University School of Medicine, 77 Gyeryong-ro, Jung-gu, Daejeon 34824, Korea;
| | - Yong-Beom Shin
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- KRIBB School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
| | - Min-Kyu Oh
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Korea
- Correspondence: (M.-K.O.); (M.K.); Tel.: +82-2-3290-3308 (M.-K.O.); +82-42-8798447 (M.K.); Fax: +82-2-926-6102 (M.-K.O.); +82-42-879-8594 (M.K.)
| | - Moonil Kim
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahang-ro, Yuseong-gu, Daejeon 34141, Korea; (Y.O.); (Y.-B.S.)
- KRIBB School, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
- Correspondence: (M.-K.O.); (M.K.); Tel.: +82-2-3290-3308 (M.-K.O.); +82-42-8798447 (M.K.); Fax: +82-2-926-6102 (M.-K.O.); +82-42-879-8594 (M.K.)
| |
Collapse
|
7
|
Bobak CA, Kang L, Workman L, Bateman L, Khan MS, Prins M, May L, Franchina FA, Baard C, Nicol MP, Zar HJ, Hill JE. Breath can discriminate tuberculosis from other lower respiratory illness in children. Sci Rep 2021; 11:2704. [PMID: 33526828 PMCID: PMC7851130 DOI: 10.1038/s41598-021-80970-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 12/28/2020] [Indexed: 01/30/2023] Open
Abstract
Pediatric tuberculosis (TB) remains a global health crisis. Despite progress, pediatric patients remain difficult to diagnose, with approximately half of all childhood TB patients lacking bacterial confirmation. In this pilot study (n = 31), we identify a 4-compound breathprint and subsequent machine learning model that accurately classifies children with confirmed TB (n = 10) from children with another lower respiratory tract infection (LRTI) (n = 10) with a sensitivity of 80% and specificity of 100% observed across cross validation folds. Importantly, we demonstrate that the breathprint identified an additional nine of eleven patients who had unconfirmed clinical TB and whose symptoms improved while treated for TB. While more work is necessary to validate the utility of using patient breath to diagnose pediatric TB, it shows promise as a triage instrument or paired as part of an aggregate diagnostic scheme.
Collapse
Affiliation(s)
- Carly A. Bobak
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA ,grid.254880.30000 0001 2179 2404Geisel School of Medicine, Dartmouth College, Hanover, NH USA
| | - Lili Kang
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA
| | - Lesley Workman
- grid.415742.10000 0001 2296 3850Department of Pediatrics and Child Health, MRC Unit on Child and Adolescent Health, University of Cape Town and Red Cross War Memorial Children’s Hospital, Cape Town, South Africa
| | - Lindy Bateman
- grid.415742.10000 0001 2296 3850Department of Pediatrics and Child Health, MRC Unit on Child and Adolescent Health, University of Cape Town and Red Cross War Memorial Children’s Hospital, Cape Town, South Africa
| | - Mohammad S. Khan
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA
| | - Margaretha Prins
- grid.415742.10000 0001 2296 3850Department of Pediatrics and Child Health, MRC Unit on Child and Adolescent Health, University of Cape Town and Red Cross War Memorial Children’s Hospital, Cape Town, South Africa
| | - Lloyd May
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA
| | - Flavio A. Franchina
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA ,grid.4861.b0000 0001 0805 7253Molecular Systems, Organic and Biological Analytical Chemistry Group, University of Liège, Liège, Belgium
| | - Cynthia Baard
- grid.415742.10000 0001 2296 3850Department of Pediatrics and Child Health, MRC Unit on Child and Adolescent Health, University of Cape Town and Red Cross War Memorial Children’s Hospital, Cape Town, South Africa
| | - Mark P. Nicol
- grid.7836.a0000 0004 1937 1151Division of Medical Microbiology and Institute for Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa ,grid.1012.20000 0004 1936 7910School of Biomedical Sciences, University of Western Australia, Perth, Australia
| | - Heather J. Zar
- grid.415742.10000 0001 2296 3850Department of Pediatrics and Child Health, MRC Unit on Child and Adolescent Health, University of Cape Town and Red Cross War Memorial Children’s Hospital, Cape Town, South Africa
| | - Jane E. Hill
- grid.254880.30000 0001 2179 2404Thayer School of Engineering, Dartmouth College, Hanover, NH USA
| |
Collapse
|
8
|
Fiebig L, Beyene N, Burny R, Fast CD, Cox C, Mgode GF. From pests to tests: training rats to diagnose tuberculosis. Eur Respir J 2020; 55:55/3/1902243. [DOI: 10.1183/13993003.02243-2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 01/07/2020] [Indexed: 11/05/2022]
|
9
|
Ratiu IA, Bocos-Bintintan V, Monedeiro F, Milanowski M, Ligor T, Buszewski B. An Optimistic Vision of Future: Diagnosis of Bacterial Infections by Sensing Their Associated Volatile Organic Compounds. Crit Rev Anal Chem 2019; 50:501-512. [PMID: 31514505 DOI: 10.1080/10408347.2019.1663147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Simple tests using sniff analysis that have the ability of diagnosing and rapidly distinguishing between infections due to different bacteria are urgently required by medical community worldwide. Professionals interested in this topic wish for these tests to be simultaneously cheap, fast, easily applicable, non-invasive, robust, reliable, and sensitive. Current analytical instrumentation has already the ability for performing real time (minutes or a few dozens of minutes) analysis of volatile bacterial biomarkers (the VOCs emitted by bacteria). Although many articles are available, a review displaying an objective evaluation of the current status in the field is still needed. This review tries to present an overview regarding the bacterial biomarkers released from in vitro cultivation of various bacterial strains and also from different biological matrices investigated, over the last 10 years. We have described results of relevant studies, which used modern analytical techniques to evaluate specific biomarker profiles associated with bacterial infections. Our purpose was to present a comprehensive view of available possibilities for detection of emitted bacterial VOCs from different matrices. We intend that this review to be of general interest for both medical doctors and for all researchers preoccupied with bacterial infectious diseases and their rapid diagnosis using analytical instrumentation.
Collapse
Affiliation(s)
- Ileana-Andreea Ratiu
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland.,Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University, Toruń, Poland.,Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania
| | - Victor Bocos-Bintintan
- Faculty of Environmental Science and Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania
| | - Fernanda Monedeiro
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland.,Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University, Toruń, Poland.,Department of Chemistry, Faculty of Philosophy, Science and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, CEP, Brazil
| | - Maciej Milanowski
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland.,Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University, Toruń, Poland
| | - Tomasz Ligor
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland.,Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University, Toruń, Poland
| | - Bogusław Buszewski
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland.,Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University, Toruń, Poland
| |
Collapse
|
10
|
Saktiawati AMI, Putera DD, Setyawan A, Mahendradhata Y, van der Werf TS. Diagnosis of tuberculosis through breath test: A systematic review. EBioMedicine 2019; 46:202-214. [PMID: 31401197 PMCID: PMC6712009 DOI: 10.1016/j.ebiom.2019.07.056] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/20/2019] [Accepted: 07/22/2019] [Indexed: 12/28/2022] Open
Abstract
Background Breath tests may diagnose tuberculosis (TB) through detecting specific volatile organic compounds produced by Mycobacterium tuberculosis or the infected host. Methods To estimate the diagnostic accuracy of breath test with electronic-nose and other devices against culture or other tests for TB, we screened multiple databases until January 6, 2019. Findings We included fourteen studies, with 1715 subjects in the analysis. The pooled sensitivity and specificity of electronic-nose were 0.93 (95% CI 0.82–0.97) and 0.93 (95% CI 0.82–0.97), respectively, and no heterogeneity was found. The sensitivity and specificity of other breath test devices ranged from 0.62 to 1.00, and 0.11 to 0.84, respectively. Interpretation The low to moderate evidence of these studies shows that breath tests can diagnose TB accurately, however, to give a real-time test result, additional development is needed. Research should also focus on sputum smear negative TB, children, and the positioning of breath testing in the diagnostic work flow. Funding The authors received no specific funding for this work.
Collapse
Affiliation(s)
- Antonia M I Saktiawati
- Department of Internal Medicine, Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia; University of Groningen, University Medical Centre Groningen, Department of Pulmonary Diseases and Tuberculosis, Groningen, the Netherlands; Center for Tropical Medicine, Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | | | - Althaf Setyawan
- Department of Biostatistics, Epidemiology, and Population Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Yodi Mahendradhata
- Center for Tropical Medicine, Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia; Department of Health Policy and Management, Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Tjip S van der Werf
- University of Groningen, University Medical Centre Groningen, Department of Pulmonary Diseases and Tuberculosis, Groningen, the Netherlands; University of Groningen, University Medical Center Groningen, Department of Internal Medicine-Infectious Diseases, Groningen, the Netherlands.
| |
Collapse
|
11
|
Lewon M, Webb EK, Brotheridge SM, Cox C, Fast CD. Behavioral skills training in scent detection research: Interactions between trainer and animal behavior. J Appl Behav Anal 2019; 52:682-700. [PMID: 31016719 DOI: 10.1002/jaba.566] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 12/05/2018] [Indexed: 11/10/2022]
Abstract
Animal trainers working in scent detection programs are responsible for arranging training contingencies as well as for observing and recording animal behavior. We provided behavioral skills training (BST) to animal trainers working with scent detection rats to improve the treatment integrity of scent-detection research sessions. We evaluated the trainers' behavior at baseline and during the sequential introduction of each component of BST (instructions, modeling, and feedback). We observed incremental improvements in treatment integrity with the introduction of each BST component. Posttraining probes revealed that these improvements were sustained at least 3 weeks post-BST. As the trainers' behavior was modified during BST, we observed decrements in measures of rat performance. We discuss the nature of these interactions and their implications for the use of BST in scent detection research and in situations in which intervention with one party produces concomitant effects on the behavior of another.
Collapse
Affiliation(s)
- Matthew Lewon
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO)
| | - E Kate Webb
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO)
| | | | - Christophe Cox
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO)
| | - Cynthia D Fast
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO)
| |
Collapse
|
12
|
Revival of an ancient Greek art: scent detection as diagnostic tool for tuberculosis. Pediatr Res 2018; 84:4-5. [PMID: 29795205 DOI: 10.1038/s41390-018-0015-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 03/22/2018] [Indexed: 11/08/2022]
|
13
|
Pediatric tuberculosis detection using trained African giant pouched rats. Pediatr Res 2018; 84:99-103. [PMID: 29617007 DOI: 10.1038/pr.2018.40] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 01/12/2018] [Indexed: 01/15/2023]
Abstract
BACKGROUND Tuberculosis (TB) diagnosis in children is a challenge with up to 94% of children with TB treated empirically in TB high-burden countries. Therefore, new diagnostic tests are needed for TB diagnosis. We determined the performance of trained rats in the diagnosis of pediatric TB and whether they can improve detection rate compared to the standard of care. METHODS Presumptive TB patients in 24 TB clinics in Tanzania were tested. Samples indicated as TB-positive by rats underwent confirmation by concentrated smear microscopy. TB yield of bacteriologically confirmed pediatric TB patients (≤5 years) was compared with yield of standard of care. RESULTS Sputum samples from 55,148 presumptive TB patients were tested. Nine hundred eighty-two (1.8%) were the children between 1 and 5 years. Clinics detected 34 bacteriologically positive children, whereas rats detected additional 23 children yielding 57 bacteriologically TB-positive children. Rats increased pediatric TB detection by 67.6%. Among 1-14-year-old children, clinics detected 331 bacteriologically positive TB whereas rats found the additional 208 children with TB that were missed by clinics. Relative increase in TB case detection by rats decreased with the increase in age (P<0.0001). CONCLUSION Trained rats increase pediatric TB detection significantly and could help address the pediatric TB diagnosis challenges. Further determination of accuracy of rats involving other sample types is still needed.
Collapse
|
14
|
Cherdantseva LA, Potapova OV, Sharkova TV, Anikina AM, Kovner AV, Troitskii AV, Shkurupy VA. Cell Death and Development of Fibrotic Alterations in Lung Granuloma of BALB/c Mice during Chronic BCG-Induced Granulomatosis. Bull Exp Biol Med 2018; 165:48-51. [DOI: 10.1007/s10517-018-4096-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Indexed: 12/13/2022]
|
15
|
Palma SICJ, Traguedo AP, Porteira AR, Frias MJ, Gamboa H, Roque ACA. Machine learning for the meta-analyses of microbial pathogens' volatile signatures. Sci Rep 2018; 8:3360. [PMID: 29463885 PMCID: PMC5820279 DOI: 10.1038/s41598-018-21544-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 02/06/2018] [Indexed: 11/11/2022] Open
Abstract
Non-invasive and fast diagnostic tools based on volatolomics hold great promise in the control of infectious diseases. However, the tools to identify microbial volatile organic compounds (VOCs) discriminating between human pathogens are still missing. Artificial intelligence is increasingly recognised as an essential tool in health sciences. Machine learning algorithms based in support vector machines and features selection tools were here applied to find sets of microbial VOCs with pathogen-discrimination power. Studies reporting VOCs emitted by human microbial pathogens published between 1977 and 2016 were used as source data. A set of 18 VOCs is sufficient to predict the identity of 11 microbial pathogens with high accuracy (77%), and precision (62-100%). There is one set of VOCs associated with each of the 11 pathogens which can predict the presence of that pathogen in a sample with high accuracy and precision (86-90%). The implemented pathogen classification methodology supports future database updates to include new pathogen-VOC data, which will enrich the classifiers. The sets of VOCs identified potentiate the improvement of the selectivity of non-invasive infection diagnostics using artificial olfaction devices.
Collapse
Affiliation(s)
- Susana I C J Palma
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
| | - Ana P Traguedo
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
| | - Ana R Porteira
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
| | - Maria J Frias
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
| | - Hugo Gamboa
- LIBPhys-UNL, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
| | - Ana C A Roque
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal.
| |
Collapse
|
16
|
Abstract
Tuberculosis is responsible for more deaths worldwide than any other infectious disease. For anyone looking to learn more about this persistent public health threat, this conversational "frequently asked questions" style review addresses a breadth of questions. It offers a brief, somewhat opinionated, review of what is and is not known, particularly in light of how findings in the lab do or do not help inform the understanding of human tuberculosis.
Collapse
Affiliation(s)
- Kristine M Guinn
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Eric J Rubin
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA
| |
Collapse
|
17
|
Tan Y, Li D, Hua J, Luo S, Liu Y, Li S. Localization of a defensive volatile 4-hydroxy-4-methylpentan-2-one in the capitate glandular trichomes of Oenothera glazioviana. PLANT DIVERSITY 2017; 39:154-159. [PMID: 30159506 PMCID: PMC6112281 DOI: 10.1016/j.pld.2017.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 05/10/2017] [Accepted: 05/11/2017] [Indexed: 06/08/2023]
Abstract
Glandular trichomes of plants produce a wide variety of secondary metabolites which are considered as major defensive chemicals. The capitate glandular trichomes of Oenothera glazioviana (Onagraceae) were collected with laser microdissection and analyzed by gas chromatography-mass spectrometry. The volatile compound 4-hydroxy-4-methylpentan-2-one (1) was identified. We found that compound 1 displays antimicrobial, insecticidal, and phytotoxic activities. These results suggest that compound 1 might function as a defensive compound in the capitate glandular trichomes of O. glazioviana against pathogens, insect herbivores, and presumably competitive plants as well.
Collapse
Affiliation(s)
- Yanyun Tan
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Desen Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Juan Hua
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Shihong Luo
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
| | - Yan Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
| | - Shenghong Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, PR China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, PR China
| |
Collapse
|
18
|
Mulder C, Mgode G, Reid SE. Tuberculosis diagnostic technology: an African solution … think rats. Afr J Lab Med 2017; 6:420. [PMID: 28879158 PMCID: PMC5516919 DOI: 10.4102/ajlm.v6i2.420] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 09/20/2016] [Indexed: 11/17/2022] Open
Affiliation(s)
- Christiaan Mulder
- Tuberculosis Department, Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Sokoine University of Agriculture, Morogoro, Tanzania.,Amsterdam Institute for Global Health and Development, Amsterdam, the Netherlands
| | - Georgies Mgode
- Tuberculosis Department, Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Sokoine University of Agriculture, Morogoro, Tanzania
| | - Stewart E Reid
- Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.,Division of Infectious Diseases, University of Alabama at Birmingham, Birmingham, Alabama, United States
| |
Collapse
|
19
|
van Noord D, Kolkman JJ. Functional testing in the diagnosis of chronic mesenteric ischemia. Best Pract Res Clin Gastroenterol 2017; 31:59-68. [PMID: 28395789 DOI: 10.1016/j.bpg.2016.12.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 12/03/2016] [Accepted: 12/17/2016] [Indexed: 01/31/2023]
Abstract
Chronic mesenteric ischemia (CMI) results from insufficient oxygen delivery or utilization to meet metabolic demand. Two main mechanisms may lead to mesenteric ischemia: occlusion in the arteries or veins of the gastrointestinal tract, or reduced blood flow from shock states or increased intra-abdominal pressure, so-called non-occlusive mesenteric ischemia. Severe stenoses in the three main mesenteric vessels as demonstrated with CT-angiography or MR-angiography are sufficient to proof mesenteric ischemia, for example in patients who present with weight loss, postprandial pain and diarrhea. Still in many clinical situations mesenteric ischemia is only one of many possible explanations. Especially in patients with a single vessel stenosis in the celiac artery or superior mesenteric artery with postprandial pain, mesenteric ischemia remains a diagnosis of probability or assumption without functional proof of actual ischemia. This review is aimed to provide an overview of all past, present and future ways to functionally proof CMI.
Collapse
Affiliation(s)
- Desirée van Noord
- Erasmus MC University Medical Center Rotterdam, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands; Franciscus Gasthuis & Vlietland, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands.
| | - Jeroen J Kolkman
- Medisch Spectrum Twente, Department of Gastroenterology and Hepatology, Enschede, The Netherlands; Universitair Medisch Centrum Groningen, Department of Gastroenterology and Hepatology, Groningen, The Netherlands.
| |
Collapse
|
20
|
Abstract
Olfaction enables most mammalian species to detect and discriminate vast numbers of chemical structures called odorants and pheromones. The perception of such chemical compounds is mediated via two major olfactory systems, the main olfactory system and the vomeronasal system, as well as minor systems, such as the septal organ and the Grueneberg ganglion. Distinct differences exist not only among species but also among individuals in terms of their olfactory sensitivity; however, little is known about the mechanisms that determine these differences. In research on the olfactory sensitivity of mammals, scientists thus depend in most cases on behavioral testing. In this article, we reviewed scientific studies performed on various mammalian species using different methodologies and target chemical substances. Human and non-human primates as well as rodents and dogs are the most frequently studied species. Olfactory threshold studies on other species do not exist with the exception of domestic pigs. Olfactory testing performed on seals, elephants, and bats focused more on discriminative abilities than on sensitivity. An overview of olfactory sensitivity studies as well as olfactory detection ability in most studied mammalian species is presented here, focusing on comparable olfactory detection thresholds. The basics of olfactory perception and olfactory sensitivity factors are also described.
Collapse
|
21
|
Neto MF, Nguyen QH, Marsili J, McFall SM, Voisine C. The nematode Caenorhabditis elegans displays a chemotaxis behavior to tuberculosis-specific odorants. J Clin Tuberc Other Mycobact Dis 2016; 4:44-49. [PMID: 31723687 PMCID: PMC6850256 DOI: 10.1016/j.jctube.2016.06.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 05/28/2016] [Accepted: 06/01/2016] [Indexed: 01/02/2023] Open
Abstract
A simple, affordable diagnostic test for pulmonary tuberculosis (TB) is urgently needed to improve detection of active Mycobacterium tuberculosis. Recently, it has been suggested that animal behavior can be used as a biosensor to signal the presence of human disease. For example, the giant African pouched rats can detect tuberculosis by sniffing sputum specimens while trained honeybees respond to three of the volatile organic compounds (VOCs) detected in the breath of TB positive patients by proboscis extension. However, both rats and honeybees require animal housing facilities and professional trainers, which are outside the scope of most disease testing facilities. Here, we report that the innate olfactory behavioral response of the roundworm nematode Caenorhabditis elegans can be used to detect the TB-specific VOCs methyl p-anisate, methyl nicotinate, methyl phenylacetate and o-phenylanisole, in chemotaxis assays. Dauer larvae, a long-lived stress resistant alternative development state of C. elegans in which the animals can survive for extended periods of time in dry conditions with no food, were also demonstrated to detect the VOCs. We propose that exposing naive dauer larvae to TB-related VOCs and recording their response in this behavioral assay could lead to the development of a new method for TB diagnostics using breath as the sample type.
Collapse
Affiliation(s)
- Mário F Neto
- Center for Innovation in Global Health Technologies (CIGHT), Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Quan H Nguyen
- Department of Biology, Northeastern Illinois University, Chicago, IL 60625, USA
| | - Joseph Marsili
- Department of Biology, Northeastern Illinois University, Chicago, IL 60625, USA
| | - Sally M McFall
- Center for Innovation in Global Health Technologies (CIGHT), Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Cindy Voisine
- Department of Biology, Northeastern Illinois University, Chicago, IL 60625, USA
| |
Collapse
|
22
|
Chingin K, Liang J, Liu Y, Chen L, Wu X, Hu L, Ouyang Y. Rapid detection of Mycobacterium tuberculosis cultures by direct ambient corona discharge ionization mass spectrometry of volatile metabolites. RSC Adv 2016. [DOI: 10.1039/c6ra12107a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
High-throughput TB screening with high chemical specificity is achieved using direct ambient corona discharge ionization MS analysis of volatile metabolites.
Collapse
Affiliation(s)
- Konstantin Chingin
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation
- East China University of Technology
- Nanchang City
- P. R. China
| | - Juchao Liang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation
- East China University of Technology
- Nanchang City
- P. R. China
| | - Yanling Liu
- The Second Affiliated Hospital of Nanchang University
- Nanchang City
- P. R. China
| | - Linfei Chen
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation
- East China University of Technology
- Nanchang City
- P. R. China
| | - Xiaoping Wu
- Department of Infections, the First Affiliated Hospital of Nanchang University
- Nanchang City
- P. R. China
| | - Longhua Hu
- The Second Affiliated Hospital of Nanchang University
- Nanchang City
- P. R. China
| | - Yongzhong Ouyang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation
- East China University of Technology
- Nanchang City
- P. R. China
| |
Collapse
|
23
|
Reither K, Jugheli L, Glass TR, Sasamalo M, Mhimbira FA, Weetjens BJ, Cox C, Edwards TL, Mulder C, Beyene NW, Mahoney A. Evaluation of Giant African Pouched Rats for Detection of Pulmonary Tuberculosis in Patients from a High-Endemic Setting. PLoS One 2015; 10:e0135877. [PMID: 26445086 PMCID: PMC4596709 DOI: 10.1371/journal.pone.0135877] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 07/27/2015] [Indexed: 11/18/2022] Open
Abstract
Background This study established evidence about the diagnostic performance of trained giant African pouched rats for detecting Mycobacterium tuberculosis in sputum of well-characterised patients with presumptive tuberculosis (TB) in a high-burden setting. Methods The TB detection rats were evaluated using sputum samples of patients with presumptive TB enrolled in two prospective cohort studies in Bagamoyo, Tanzania. The patients were characterised by sputum smear microscopy and culture, including subsequent antigen or molecular confirmation of Mycobacterium tuberculosis, and by clinical data at enrolment and for at least 5-months of follow-up to determine the reference standard. Seven trained giant African pouched rats were used for the detection of TB in the sputum samples after shipment to the APOPO project in Morogoro, Tanzania. Results Of 469 eligible patients, 109 (23.2%) were culture-positive for Mycobacterium tuberculosis and 128 (27.3%) were non-TB controls with sustained recovery after 5 months without anti-TB treatment. The HIV prevalence was 46%. The area under the receiver operating characteristic curve of the seven rats for the detection of culture-positive pulmonary tuberculosis was 0.72 (95% CI 0.66–0.78). An optimal threshold could be defined at ≥2 indications by rats in either sample with a corresponding sensitivity of 56.9% (95% CI 47.0–66.3), specificity of 80.5% (95% CI 72.5–86.9), positive and negative predictive value of 71.3% (95% CI 60.6–80.5) and 68.7% (95% CI 60.6–76.0), and an accuracy for TB diagnosis of 69.6%. The diagnostic performance was negatively influenced by low burden of bacilli, and independent of the HIV status. Conclusion Giant African pouched rats have potential for detection of tuberculosis in sputum samples. However, the diagnostic performance characteristics of TB detection rats do not currently meet the requirements for high-priority, rapid sputum-based TB diagnostics as defined by the World Health Organization.
Collapse
Affiliation(s)
- Klaus Reither
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
- Ifakara Health Institute, Bagamoyo, Tanzania
- * E-mail:
| | - Levan Jugheli
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
- Ifakara Health Institute, Bagamoyo, Tanzania
| | - Tracy R. Glass
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | | | | | - Bart J. Weetjens
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
| | - Christophe Cox
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
| | - Timothy L. Edwards
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
- Department of Psychology, Western Michigan University, Kalamazoo, Michigan, United States of America
| | - Christiaan Mulder
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
- Amsterdam Institute for Global Health and Development, Amsterdam, The Netherlands
| | - Negussie W. Beyene
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
| | - Amanda Mahoney
- Anti-Persoonsmijnen Ontmijnende Product Ontwikkeling (APOPO), Morogoro, Tanzania
- Department of Psychology, Western Michigan University, Kalamazoo, Michigan, United States of America
| |
Collapse
|
24
|
Poling A, Mahoney A, Beyene N, Mgode G, Weetjens B, Cox C, Durgin A. Using giant African pouched rats to detect human tuberculosis: a review. Pan Afr Med J 2015; 21:333. [PMID: 26587178 PMCID: PMC4634033 DOI: 10.11604/pamj.2015.21.333.2977] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 11/30/2013] [Indexed: 11/11/2022] Open
Abstract
Despite its characteristically low sensitivity, sputum smear microscopy remains the standard for diagnosing tuberculosis (TB) in resource-poor countries. In an attempt to develop an alternative or adjunct to microscopy, researchers have recently examined the ability of pouched rats to detect TB-positive human sputum samples and the microbiological variables that affect their detection. Ten published studies, reviewed herein, suggest that the rats are able to detect the specific odor of Mycobacterium tuberculosis, which causes TB, and can substantially increase new-case detections when used for second-line TB screening following microscopy. Further research is needed to ascertain the rats' ability to detect TB in children and in HIV-positive patients, to detect TB when used for first-line screening, and to be useful in broad-scale applications where cost-effectiveness is a major consideration.
Collapse
Affiliation(s)
- Alan Poling
- Department of Psychology, Western Michigan University, Kalamazoo, Michigan 49008, United States of America ; APOPO, Tanzania
| | | | | | - Georgies Mgode
- APOPO, Tanzania ; Sokoine University of Agriculture, Tanzania
| | | | | | | |
Collapse
|
25
|
Mgode GF, Cohen-Bacrie S, Bedotto M, Weetjens BJ, Cox C, Jubitana M, Kuipers D, Machang'u RS, Kazwala R, Mfinanga SG, Kaufmann SHE, Drancourt M. Mycobacterium genotypes in pulmonary tuberculosis infections and their detection by trained African giant pouched rats. Curr Microbiol 2014; 70:212-8. [PMID: 25274413 DOI: 10.1007/s00284-014-0705-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 08/19/2014] [Indexed: 11/28/2022]
Abstract
Tuberculosis (TB) diagnosis in low-income countries is mainly done by microscopy. Hence, little is known about the diversity of Mycobacterium spp. in TB infections. Different genotypes or lineages of Mycobacterium tuberculosis vary in virulence and induce different inflammatory and immune responses. Trained Cricetomys rats show a potential for rapid diagnosis of TB. They detect over 28 % of smear-negative, culture-positive TB. However, it is unknown whether these rats can equally detect sputa from patients infected with different genotypes of M. tuberculosis. A 4-month prospective study on diversity of Mycobacterium spp. was conducted in Dar es Salaam, Tanzania. 252 sputa from 161 subjects were cultured on Lowenstein-Jensen medium and thereafter tested by rats. Mycobacterial isolates were subjected to molecular identification and multispacer sequence typing (MST) to determine species and genotypes. A total of 34 Mycobacterium spp. isolates consisting of 32 M. tuberculosis, 1 M. avium subsp. hominissuis and 1 M. intracellulare were obtained. MST analyses of 26 M. tuberculosis isolates yielded 10 distinct MST genotypes, including 3 new genotypes with two clusters of related patterns not grouped by geographic areas. Genotype MST-67, shared by one-third of M. tuberculosis isolates, was associated with the Mwananyamala clinic. This study shows that diverse M. tuberculosis genotypes (n = 10) occur in Dar es Salaam and trained rats detect 80 % of the genotypes. Sputa with two M. tuberculosis genotypes (20 %), M. avium hominissuis and M. intracellulare were not detected. Therefore, rats detect sputa with different M. tuberculosis genotypes and can be used to detect TB in resource-poor countries.
Collapse
Affiliation(s)
- Georgies F Mgode
- Department of Immunology, Max Planck Institute for Infection Biology, Charitéplatz 1, Campus Charité Mitte, 10117, Berlin, Germany
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|