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1.
Evaluation of Streptozyme and Antistreptolysin O Tests in Streptococcal Pyodermal Nephritis 总被引:4,自引:1,他引:3
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Sonya Bergner-Rabinowitz I. Ofek S. Fleiderman M. Zohar K. Rabinowitz I. Ginsburg 《Applied microbiology》1973,26(1):56-58
The evaluation of the streptozyme test in sera from 34 patients with streptococcal pyodermal nephritis was studied. Ninety-seven percent of the patients developed high titers of antistreptozyme antibodies on the first bleeding after hospitalization, in contrast to only 40% of patients who developed elevated antistreptolysin O titers. The high antistreptozyme titers declined during convalescence and reached normal levels in the sixth month after onset of the disease. The most significant fall in titers occurred between 1 and 2 months from the onset of disease. The streptozyme test may be particularly helpful as a rapid screening test for antibodies in streptococcal pyodermal nephritis. 相似文献
2.
Microtiter Hemagglutination-Inhibition Test for the Detection of Encephalomyocarditis Virus Antibodies
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Several variables were found to affect the agglutination of sheep erythrocytes by encephalomyocarditis virus. A satisfactory and reliable microtiter hemagglutination-inhibition test is described. 相似文献
3.
Indirect Hemagglutination Test for Detection of Antibodies to Cytomegalovirus 总被引:21,自引:3,他引:18
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An indirect hemagglutination test has been adapted for use with cytomegalovirus. The test is highly sensitive and reproducible. Both immunoglobulin M and immunoglobulin G antibodies can be detected by this method. The hemagglutination reaction can be inhibited by small amounts of homologous antigen. This principle permits early identification of virus isolated from diagnostic specimens. 相似文献
4.
Sylvie Bisser Crispin Lumbala Etienne Nguertoum Victor Kande Laurence Flevaud Gedeao Vatunga Marleen Boelaert Philippe Büscher Theophile Josenando Paul R. Bessell Sylvain Biéler Joseph M. Ndung’u 《PLoS neglected tropical diseases》2016,10(4)
Background
A major challenge in the control of human African trypanosomiasis (HAT) is lack of reliable diagnostic tests that are rapid and easy to use in remote areas where the disease occurs. In Trypanosoma brucei gambiense HAT, the Card Agglutination Test for Trypanosomiasis (CATT) has been the reference screening test since 1978, usually on whole blood, but also in a 1/8 dilution (CATT 1/8) to enhance specificity. However, the CATT is not available in a single format, requires a cold chain for storage, and uses equipment that requires electricity. A solution to these challenges has been provided by rapid diagnostic tests (RDT), which have recently become available. A prototype immunochromatographic test, the SD BIOLINE HAT, based on two native trypanosomal antigens (VSG LiTat 1.3 and VSG LiTat 1.5) has been developed. We carried out a non-inferiority study comparing this prototype to the CATT 1/8 in field settings.Methodology/Principal Findings
The prototype SD BIOLINE HAT, the CATT Whole Blood and CATT 1/8 were systematically applied on fresh blood samples obtained from 14,818 subjects, who were prospectively enrolled through active and passive screening in clinical studies in three endemic countries of central Africa: Angola, the Democratic Republic of the Congo and the Central African Republic. One hundred and forty nine HAT cases were confirmed by parasitology. The sensitivity and specificity of the prototype SD BIOLINE HAT was 89.26% (95% confidence interval (CI) = 83.27–93.28) and 94.58% (95% CI = 94.20–94.94) respectively. The sensitivity and specificity of the CATT on whole blood were 93.96% (95% CI = 88.92–96.79) and 95.91% (95% CI = 95.58–96.22), and of the CATT 1/8 were 89.26% (95% CI = 83.27–93.28) and 98.88% (95% CI = 98.70–99.04) respectively.Conclusion/Significance
After further optimization, the prototype SD BIOLINE HAT could become an alternative to current screening methods in primary healthcare settings in remote, resource-limited regions where HAT typically occurs. 相似文献5.
Investigations on the Specificity of the Limulus Test for the Detection of Endotoxin 总被引:22,自引:6,他引:16
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Alexander Wildfeuer Berno Heymer Karl H. Schleifer Otto Haferkamp 《Applied microbiology》1974,28(5):867-871
Lysates obtained from amoebocytes of Limulus polyphemus, the horseshoe crab, showed gel formation after the addition of bacterial endotoxin. In contrast to living gram-negative bacteria, viable gram-positive microorganisms did not cause gelation of lysate. Nevertheless, peptidoglycan isolated from the cell walls of various gram-positive organisms did induce the reaction. However, the activity of peptidoglycan was 1,000 to 400,000 times less than that of Escherichia coli lipopolysaccharide. After exposure to lysozyme, peptidoglycan no longer gelled amoebocyte lysate, therefore apparently excluding endotoxin contamination. Gelation of amoebocyte lysate by endotoxin or peptidoglycan was inhibited by different concentrations of sodium polystyrolsulfonate. Whereas these studies confirm the specificity of the Limulus test for bacterial endotoxins, they also indicate that other substances of bacterial origin should be investigated for their ability to gel amoebocyte lysate. 相似文献
6.
Response and Specificity of Antibodies for Candida albicans 总被引:11,自引:0,他引:11
Rabbit antibodies for Candida albicans, reacting in agglutination and fluorescent-antibody reactions, were present in both IgM and IgG protein fractions. The two types of immune globulins were separated from ammonium sulfate-precipitated gamma-globulin either by filtration through a column of Sephadex G-200 or by diethylaminoethyl column chromatography performed by stepwise elution with various concentrations of sodium chloride. In the fluorescent-antibody test, initial separation of the IgG fraction, prior to its conjugation with dye, proved to be essential for the high specificity of this reaction. Investigation of the specificities of the two types of antibodies revealed that the IgG was highly specific, whereas the IgM was not very specific. Each antigen fraction, extracted by various methods, demonstrated its own characteristic antibody response. Only the IgG fraction yielded serotype-specific antibody useful for detection of a serotype of C. albicans in agglutination and fluorescent-antibody tests. The results indicate the importance of IgG for specific serological reactions with the Candida species. 相似文献
7.
Yukie Maruyama Yusuke Nakamichi Takafumi Itoh Bunzo Mikami Wataru Hashimoto Kousaku Murata 《The Journal of biological chemistry》2009,284(27):18059-18069
Unsaturated glucuronyl hydrolase (UGL) categorized into the glycoside hydrolase family 88 catalyzes the hydrolytic release of an unsaturated glucuronic acid from glycosaminoglycan disaccharides, which are produced from mammalian extracellular matrices through the β-elimination reaction of polysaccharide lyases. Here, we show enzyme characteristics of pathogenic streptococcal UGLs and structural determinants for the enzyme substrate specificity. The putative genes for UGL and phosphotransferase system for amino sugar, a component of glycosaminoglycans, are assembled into a cluster in the genome of pyogenic and hemolytic streptococci such as Streptococcus agalactiae, Streptococcus pneumoniae, and Streptococcus pyogenes, which produce extracellular hyaluronate lyase as a virulent factor. The UGLs of these three streptococci were overexpressed in Escherichia coli cells, purified, and characterized. Streptococcal UGLs degraded unsaturated hyaluronate and chondroitin disaccharides most efficiently at approximately pH 5.5 and 37 °C. Distinct from Bacillus sp. GL1 UGL, streptococcal UGLs preferred sulfated substrates. DNA microarray and Western blotting indicated that the enzyme was constitutively expressed in S. agalactiae cells, although the expression level increased in the presence of glycosaminoglycan. The crystal structure of S. agalactiae UGL (SagUGL) was determined at 1.75 Å resolution by x-ray crystallography. SagUGL adopts α6/α6-barrel structure as a basic scaffold similar to Bacillus UGL, but the arrangement of amino acid residues in the active site differs between the two. SagUGL Arg-236 was found to be one of the residues involved in its activity for the sulfated substrate through structural comparison and site-directed mutagenesis. This is the first report on the structure and function of streptococcal UGLs.Cell surface polysaccharides play an important role in linking neighboring cells and protecting cells against physicochemical stress such as osmotic pressure or invasion by pathogens. Glycosaminoglycans such as chondroitin, hyaluronan, and heparin are highly negatively charged polysaccharides with a repeating disaccharide unit consisting of an uronic acid residue (glucuronic or iduronic acid) and an amino sugar residue (glucosamine or galactosamine) (1), and they are widely present in mammalian cells as an extracellular matrix responsible for cell-to-cell association, cell signaling, and cell growth and differentiation (2). For example, in humans, glycosaminoglycans exist in tissues such as the eye, brain, liver, skin, and blood (3). Except for hyaluronan, glycosaminoglycans such as chondroitin sulfate, dermatan sulfate, keratan sulfate, heparin sulfate, and heparan sulfate are often sulfated. Chondroitin consists of d-glucuronic acid (GlcA)2 and N-acetyl-d-galactosamine (GalNAc) with a sulfate group(s) at position 4 or 6 or both (4). Hyaluronan, is composed of GlcA and N-acetyl-d-glucosamine (GlcNAc) (5).The adhesion of pathogenic bacteria to mammalian cells is regarded as a primary mechanism of bacterial infection, followed by secondary effects of the infectious process. Polysaccharides, including the glycosaminoglycans that form part of the cell surface matrix, are typical targets for microbial pathogens that invade host cells, and many specific interactions between pathogens and these polysaccharides have been described (6). Glycosaminoglycans in the extracellular matrix are also degraded enzymatically by hydrolases and lyases (1). Generally, hydrolases cleave the glycoside bonds between the glycosyl oxygen and the anomeric carbon atom through the addition of water and play an important role in glycosaminoglycan metabolism in mammals (7). On the other hand, bacterial pathogens invading host cells degrade glycosaminoglycans through the action of lyases. Bacterial polysaccharide lyases recognize the uronic acid residue in polysaccharides, cleave the glycoside bonds through the β-elimination reaction without water addition, and produce unsaturated saccharides with the unsaturated uronic acid residue having a CC double bond at the nonreducing terminus (8).Streptococci such as group B Streptococcus agalactiae, group nonassigned Streptococcus pneumoniae, and group A Streptococcus pyogenes are typical pyogenic and hemolytic pathogens causing severe infections (e.g. pneumonia, bacteremia, sinusitis, or meningitis) (9–11). In S. pneumoniae, hyaluronate lyase, neuraminidases, autolysin, choline-binding protein A, and pneumococcal surface protein A are suggested to function as cell surface virulent factors (12). Hyaluronate lyase degrades the extracellular matrix component hyaluronan in mammalian cells through the β-elimination reaction and releases unsaturated disaccharide, indicating that the enzyme produced by pathogenic bacteria functions as a spreading factor (13). Because hyaluronate lyase is commonly produced by the three pyogenic and hemolytic streptococci (14–16), the structure and function of their enzymes have been intensively studied (17, 18). Groups A, B, C, and G streptococci also produce hyaluronate lyase (19), suggesting that the enzyme is ubiquitously present in pathogenic streptococci. Streptococcal hyaluronate lyase can also act on sulfated and nonsulfated chondroitin (20). The metabolism of the resultant unsaturated disaccharides in streptococci, however, remains to be clarified.Unsaturated glucuronyl hydrolase (UGL), a member of the glycoside hydrolase family 88 in the CAZY data base (21), acts on unsaturated oligosaccharides having an unsaturated GlcA (ΔGlcA) with β-glycoside bond, such as ΔGlcA-GalNAc produced by chondroitin lyase and ΔGlcA-GlcNAc produced by hyaluronate lyase (22) (Fig. 1A). We have first identified the UGL-coding gene in Bacillus sp. GL1 (23) and clarified the structure and function of the enzyme by x-ray crystallography (24–27). The enzyme reaction generates ΔGlcA and the leaving saccharide. ΔGlcA is spontaneously converted to 4-deoxy-1-threo-5-hexosulose-uronate (Fig. 1A) because the ringed form of ΔGlcA has not been obtained because of keto-enole equilibrium (23, 28). In contrast with general glycoside hydrolases with retention or inversion catalytic mechanism of an anomeric configuration, UGL uniquely triggers hydrolysis of vinyl ether groups in unsaturated saccharides but not of the glycoside bond (26) (Fig. 1B). This article deals with the characteristics of streptococcal UGLs by using recombinant enzymes, gene expression in S. agalactiae cells by DNA microarray, and structural determinants of S. agalactiae UGL for substrate specificity by x-ray crystallography and site-directed mutagenesis.Open in a separate windowFIGURE 1.UGL reaction. A, degradation scheme of Δ6S by UGL. B, catalytic reaction mechanism of UGL. C, structures of unsaturated oligosaccharides. ΔGellan, unsaturated gellan tetrasaccharide; ΔHA, unsaturated hyaluronan disaccharide; Δ0S, unsaturated chondroitin disaccharide; Δ2′S, unsaturated chondroitin disaccharide sulfated at C-2 position of ΔGlcA residue; Δ2′S4S, unsaturated chondroitin disaccharide sulfated at C-2 position of ΔGlcA residue and C-4 position of GalNAc residue; Δ2′S6S, unsaturated chondroitin disaccharide sulfated at C-2 position of ΔGlcA residue and C-6 position of GalNAc residue; Δ4S6S, unsaturated chondroitin disaccharide sulfated at C-4 and C-6 positions of GalNAc residue; Δ2′S4S6S, unsaturated chondroitin disaccharide sulfated at C-2 position of ΔGlcA residue and C-4 and C-6 positions of GalNAc residue. 相似文献
8.
Cyrille Goarant Pascale Bourhy Eric D'Ortenzio Sylvie Dartevelle Carine Mauron Marie-Estelle Soupé-Gilbert Lilian Bruyère-Ostells Ann-Claire Gourinat Mathieu Picardeau Faridabano Nato Suzanne Chanteau 《PLoS neglected tropical diseases》2013,7(6)
Background: Leptospirosis is a growing public health concern in many tropical and subtropical countries. However, its diagnosis is difficult because of non-specific symptoms and concurrent other endemic febrile diseases. In many regions, the laboratory diagnosis is not available due to a lack of preparedness and simple diagnostic assay or difficult access to reference laboratories. Yet, an early antibiotic treatment is decisive to the outcome. The need for Rapid Diagnostic Tests (RDTs) for bedside diagnosis of leptospirosis has been recognized. We developed a vertical flow immunochromatography strip RDT detecting anti-Leptospira human IgM and evaluated it in patients from New Caledonia, France, and French West Indies.
Methodology/Principal Findings: Whole killed Leptospira fainei cells were used as antigen for the test line and purified human IgM as the control line. The mobile phase was made of gold particles conjugated with goat anti-human IgM. Standards for Reporting of Diagnostic Accuracy criteria were used to assess the performance of this RDT. The Microscopic Agglutination Test (MAT) was used as the gold standard with a cut-off titer of ≥400. The sensitivity was 89.8% and the specificity 93.7%. Positive and negative Likelihood Ratios of 14.18 and 0.108 respectively, and a Diagnostic Odds Ratio of 130.737 confirmed its usefulness. This RDT had satisfactory reproducibility, repeatability, thermal tolerance and shelf-life. The comparison with MAT evidenced the earliness of the RDT to detect seroconversion. When compared with other RDT, the Vertical Flow RDT developed displayed good diagnostic performances.
Conclusions/Significance
This RDT might be used as a point of care diagnostic tool in limited resources countries. An evaluation in field conditions and in other epidemiological contexts should be considered to assess its validity over a wider range of serogroups or when facing different endemic pathogens. It might prove useful in endemic contexts or outbreak situations. 相似文献9.
George C. Klein Carolyn N. Baker Betty V. Addison Max D. Moody 《Applied microbiology》1969,18(2):204-206
A methyl green decolorization micro test for the determination of streptococcal anti-deoxyribonuclease B titers in serum is described. The micro test was compared with an alcohol precipitation macro test on 112 human sera. The anti-deoxyribonuclease B titers agreed within one dilution step for 85.7% of the 112 sera examined by both techniques. Both tests were about equal in the detection of titers above the upper limits of normal. The micro test requires smaller amounts of reagents and fewer man-hours to perform than the macro test. This translates into lower cost per test and more tests per man-hour. 相似文献
10.
Robertson A Boulanger P 《Canadian journal of comparative medicine and veterinary science》1963,27(5):113-120
The MA and CF tests using alcohol extracted antigens have been compared with sera from infected rabbits and calves. The MA test was highly serotype specific with serum from both animal species. The CF test was broadly reactive with serum from rabbits infected with various serotypes. However, when bovine serum was used cross reactivity was reduced and it was necessary to use pooled antigens to detect heterologous serotypes. 相似文献
11.
Microtiter Indirect Hemagglutination Procedure for Identification of Streptococcal M-Protein Antibodies 总被引:7,自引:2,他引:5
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A number of investigators have attempted to utilize the hemagglutination system for detection of streptococcal type-specific antibody in human sera. Cross-reactions have made the procedure unreliable without cumbersome and time-consuming manipulation of the test sera. A method is described in which a microtiter indirect hemagglutination technique, using sensitized sheep erythrocytes, is sensitive, specific, and reliable for titration of type-specific antibody after naturally acquired or induced streptococcal infection. 相似文献
12.
A modified technique for production of antigen and performance of the test is described. A suspension of infected neutrophils was directly applied to multiwell slides. Multichannel pipettes may be used for dilution and application of sera. The modification inreases the capacity both by production of the antigen and by performance of the test. This paper also gives a quantitative determination of the antibodies. 相似文献
13.
Yannick Marchalant Philip W. Brownjohn Amandine Bonnet Torsten Kleffmann John C. Ashton 《The journal of histochemistry and cytochemistry》2014,62(6):395-404
Antibody-based methods for the detection and quantification of membrane integral proteins, in particular, the G protein-coupled receptors (GPCRs), have been plagued with issues of primary antibody specificity. In this report, we investigate one of the most commonly utilized commercial antibodies for the cannabinoid CB2 receptor, a GPCR, using immunoblotting in combination with mass spectrometry. In this way, we were able to develop powerful negative and novel positive controls. By doing this, we are able to demonstrate that it is possible for an antibody to be sensitive for a protein of interest—in this case CB2—but still cross-react with other proteins and therefore lack specificity. Specifically, we were able to use western blotting combined with mass spectrometry to unequivocally identify CB2 protein in over-expressing cell lines. This shows that a common practice of validating antibodies with positive controls only is insufficient to ensure antibody reliability. In addition, our work is the first to develop a label-free method of protein detection using mass spectrometry that, with further refinement, could provide unequivocal identification of CB2 receptor protein in native tissues. 相似文献
14.
Mohammad R. Hasan John D. Brunstein Ghada Al-Rawahi Rusung Tan Eva Thomas Peter Tilley 《Current microbiology》2013,66(1):61-63
Suspected colonies of methicillin-resistant Staphylococcus aureus (MRSA) on chromogenic, MRSASelect (BioRad) medium were confirmed using routine microbiological methods, and a multiplex real-time PCR (n = 108). Although the specificity of MRSASelect assessed at 24 h of incubation was much higher than that of 48 h (91.4 vs. 60 %), extending the incubation time to 48 h, along with PCR confirmation, increased the total number of true positive samples by 27.8 %. These results provide a cost effective method for sensitive and specific detection of MRSA. 相似文献
15.
The sensitivity and specificity of the polymerase chain reaction (PCR) test kit, AMPLICOR Chlamydia trachomatis, were examined by the use of purified elementary bodies (EBs), cells having inclusions containing reticulate bodies alone and 20 clinical isolates. The numbers of EB and inclusion of C. trachomatis at the detection limit were determined to be approximately 2 to 4 EBs and one inclusion per assay, respectively. No reaction occurred for C. psittaci and C. pneumoniae. All clinical isolates were positively reacted in the PCR assay. 相似文献
16.
Shunji Hayashi Kenji Yokota Yoshihiko Takizawa Isao Tomizawa Tetsuya Nejime Keiji Oguma 《Microbiology and immunology》1993,37(4):271-279
Capture enzyme-linked immunosorbent assays (ELISAs) were developed to detect immunoglobulin G and M antibodies to group A streptococcal (GAS) antigens, streptolysin O, streptokinase, and group A carbohydrate. The sensitivities and the specificities of the IgM capture ELISAs to each GAS antigen were high enough to distinguish the patients with GAS infections (diagnosed as GAS pharyngitis or scarlet fever) from the control groups (healthy people and patients with pharyngitis from whom GAS could not be isolated). On the other hand, the specificities of the IgG capture ELISAs were not very effective in diagnosis of GAS infections. When the capture ELISA and an indirect ELISA detecting IgM antibodies to group A carbohydrate were compared, false-positive reactions due to rheumatoid factor occurred in the indirect ELISA, but did not occur in the capture ELISA. These results indicate that the capture ELISA works better than the indirect ELISA in detecting the IgM antibody, and that the IgM capture ELISA to GAS antigen provides a rapid and highly reliable serodiagnosis for GAS infections employing only a single serum. 相似文献
17.
Gilbert R. Irwin Alfred M. Allen William H. Bancroft Milton Willhight Philip K. Russell 《Applied microbiology》1974,28(4):600-604
Sera from a survey of 6,026 people were tested for hepatitis B surface antigen by using radioimmunoassay and counterelectrophoresis. Forty-eight sera (0.79%) were positive by counterelectrophoresis and 152 sera (2.52%) were positive by radioimmunoassay, using the most liberal of the recommended criteria for positivity (i.e., counts 3 standard deviations above the mean). Absorption tests performed on the 152 radioimmunoassay-positive sera showed that 10 (6.6%) were false-positive reactions to guinea pig protein, 74 (48.6%) were due to false-positive reaction(s) with other protein(s) in the test system, and 68 (44.8%) were true positives. There was a strong correlation between the degree of elevation of radioactive counts and the proportions of sera that were true positives; all 49 sera with counts >50 standard deviation units above the mean were true positives, but only 19 (18.4%) of the 103 sera with counts <50 standard deviation units were true positives. A few sera with high counts required absorption with type-specific (type D) antisera. The following conclusions were reached from this study: (i) absorption tests should be run on all radioimmunoassay-positive, counterelectrophoresis-negative sera; (ii) most (about 90%) false positives are not due to anti-guinea-pig protein reactions; and (iii) radioimmunoassay, in combination with absorption tests, yields a modest increase (about 35%) in detection of true positives over use of counterelectrophoresis alone. 相似文献
18.
The sensitivity and specificity of the indirect fluorescent antibody (IFA) test for the detection of serum antibodies were examined in mice that were infected with Eimeria falciformis, E. ferrisi, E. papillata, or E. vermiformis. For the study of each species, five groups of mice were given graded inoculation doses of 10, 102, 103, 104, or 105 sporulated oocysts in a primary infection. The sixth group was infected with three sequential doses of 1.5 times 103, 1.5 times 104, and 1.5 times 105 sporulated oocysts per mouse at two- to three-week intervals. All groups of infected mice developed serum antibodies. Sera were titrated by the IFA test with purified sporozoites. Strong fluorescence and high IFA titers were observed with homologous reactions mainly with the sera from mice infected with the higher inoculation dose levels in primary infections and from those given three sequential inoculation doses. Immunological cross reaction among the four species of Eimeria occurred at dilutions of 1:10 to 1:160. Very weak or no fluorescence of free sporozoites was observed with sera from noninfected mice, and there was no fluorescence of sporozoites contained in intact sporocysts. 相似文献
19.
Comparison of the Streptozyme Test with the Antistreptolysin O, Antideoxyribonuclease B, and Antihyaluronidase Tests 总被引:11,自引:2,他引:9
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The streptozyme test was compared with the antistreptolysin O (ASO), antideoxyribonuclease B (ADN-B), and antihyaluronidase (AH) tests. One hundred and twenty-seven human serum specimens were tested by each of the four tests. The streptozyme test detected more specimens with elevated titers than any single test; however, it was not as effective as the combination of the ASO and ADN-B tests. The streptozyme test appears to be particularly useful for laboratories which rely solely on the ASO test for serological evidence of a streptococcal infection. The test can be used in these laboratories to screen all specimens with low ASO titers (<170) for the detection of ADN, AH, antinicotinamide adenine dinucleotidase, and antistreptokinase. 相似文献
20.
Stefanie Knopp Paul L. A. M. Corstjens Artemis Koukounari Colin I. Cercamondi Shaali M. Ame Said M. Ali Claudia J. de Dood Khalfan A. Mohammed Jürg Utzinger David Rollinson Govert J. van Dam 《PLoS neglected tropical diseases》2015,9(5)