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Cassart C, Yague-Sanz C, Bauer F, Ponsard P, Stubbe FX, Migeot V, Wery M, Morillon A, Palladino F, Robert V, Hermand D. RNA polymerase II CTD S2P is dispensable for embryogenesis but mediates exit from developmental diapause in C. elegans. Sci Adv 2020; 6:6/50/eabc1450. [PMID: 33298437 PMCID: PMC7725455 DOI: 10.1126/sciadv.abc1450] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 10/21/2020] [Indexed: 06/12/2023]
Abstract
Serine 2 phosphorylation (S2P) within the CTD of RNA polymerase II is considered a Cdk9/Cdk12-dependent mark required for 3'-end processing. However, the relevance of CTD S2P in metazoan development is unknown. We show that cdk-12 lesions or a full-length CTD S2A substitution results in an identical phenotype in Caenorhabditis elegans Embryogenesis occurs in the complete absence of S2P, but the hatched larvae arrest development, mimicking the diapause induced when hatching occurs in the absence of food. Genome-wide analyses indicate that when CTD S2P is inhibited, only a subset of growth-related genes is not properly expressed. These genes correspond to SL2 trans-spliced mRNAs located in position 2 and over within operons. We show that CDK-12 is required for maximal occupancy of cleavage stimulatory factor necessary for SL2 trans-splicing. We propose that CTD S2P functions as a gene-specific signaling mark ensuring the nutritional control of the C. elegans developmental program.
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Affiliation(s)
- C Cassart
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - C Yague-Sanz
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - F Bauer
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - P Ponsard
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - F X Stubbe
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - V Migeot
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium
| | - M Wery
- ncRNA, epigenetic and genome fluidity, Institut Curie, PSL Research University, CNRS UMR 3244, Université Pierre et Marie Curie, Paris, France
| | - A Morillon
- ncRNA, epigenetic and genome fluidity, Institut Curie, PSL Research University, CNRS UMR 3244, Université Pierre et Marie Curie, Paris, France
| | - F Palladino
- Laboratory of Biology and Modeling of the Cell, UMR5239 CNRS/Ecole Normale Supérieure de Lyon, INSERM U1210, UMS 3444 Biosciences Lyon Gerland, Université de Lyon, Lyon, France
| | - V Robert
- Laboratory of Biology and Modeling of the Cell, UMR5239 CNRS/Ecole Normale Supérieure de Lyon, INSERM U1210, UMS 3444 Biosciences Lyon Gerland, Université de Lyon, Lyon, France
| | - D Hermand
- URPHYM-GEMO, The University of Namur, rue de Bruxelles, 61, Namur 5000 Belgium.
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Bargui M, Elleuch K, Wery M, Ayedi HF. Optimization of mechanical and tribological properties of anodized 5754 aluminium alloy. Surf Engin Appl Electrochem 2017. [DOI: 10.3103/s1068375517040020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jadin J, Wery M. Etude de l’activité d’un nouvel antibiotique, la rifamycine SV. Chemotherapy 2009. [DOI: 10.1159/000220128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Lepareux M, Saunier N, Gerardin C, Wery M, Foti A, Pappalardo G, Strazzeri A. States at high excitation energies in24Mg obtained from Li-induced reactions on20Ne. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bf02725355] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Processes such as electroplating or acid cleaning are notorious causes of post-processing failure through hydrogen embrittlement. So, the determination of amounts of hydrogen in metals is of great importance. An analysis method for investigation of H content in solids has been established based on hot extraction and gas chromatography system. Hot extraction in inert gas enables complete and/or partial removal of the hydrogen from the samples. A gas chromatography system is used to determine quantitatively the amount of thermally desorbed hydrogen. An investigation of the baking operating conditions is made of the hydrogen desorption rate of zinc-plated steel parts. Then, an analysis of the polarisation conditions upon chromium electroplating is given.
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Affiliation(s)
- H Addach
- Laboratoire de Chimie des Matériaux et Interfaces, Université de Franche-Comté, 16 route de Gray, Besançon Cedex 25030, France
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Chalumeau L, Wery M, Ayedi H, Chabouni M, Leclere C. Application of a Doehlert experimental design to the optimization of an Au?Co plating electrolyte. J APPL ELECTROCHEM 2004. [DOI: 10.1007/s10800-004-1703-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mesnard F, Dahlquist E, Wery M, Tahri H, Guyot D, Lucquiaud G, Mazabraud C, Ricochon M, Beauvillain B, Benoit N. Quand le maintien dans l’emploi fait partie de la santé au travail. ARCH MAL PROF ENVIRO 2004. [DOI: 10.1016/s1775-8785(04)93313-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
The heterodimeric HU protein, one of the most abundant DNA binding proteins, plays a pleiotropic role in bacteria. Among others, HU was shown to contribute to the maintenance of DNA superhelical density in Escherichia coli. By its properties HU shares some traits with histones and HMG proteins. More recently, its specific binding to DNA recombination and repair intermediates suggests that HU should be considered as a DNA damage sensor. For all these reasons, it will be of interest to follow the localization of HU within the living bacterial cells. To this end, we constructed HU-GFP fusion proteins and compared by microscopy the GFP green fluorescence with images of the nucleoid after DAPI staining. We show that DAPI and HU-GFP colocalize on the E. coli nucleoid. HU, therefore, can be considered as a natural tracer of DNA in the living bacterial cell.
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Affiliation(s)
- M Wery
- Laboratoire de Physiologie bactérienne, CNRS UPR 9073, Institut de Biologie Physico-Chimique, 13, rue Pierre-et-Marie-Curie, 75005, Paris, France
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Pellegrini O, Oberto J, Pinson V, Wery M, Rouviere-Yaniv J. Overproduction and improved strategies to purify the threenative forms of nuclease-free HU protein. Biochimie 2000; 82:693-704. [PMID: 11018285 DOI: 10.1016/s0300-9084(00)01151-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The heterodimeric HU protein was isolated from Escherichia coli as one of the most abundant DNA binding proteins associated with the bacterial nucleoid. HUalphabeta is composed of two very homologous subunits, but HU can also be present in E. coli under its two homodimeric forms, HUalpha(2) and HUbeta(2). This protein is conserved either in its heterodimeric form or in one of its homodimeric forms in all bacteria, in plant chloroplasts and in some viruses. HU can participate, like the histones, in the maintenance of DNA supercoiling and in DNA condensation. This protein which does not recognize any specific sequence on double-stranded DNA, has been shown to bind specifically to cruciform DNA as does the eukaryotic HMG1 protein and to a series of structures which are found as intermediates of DNA repair, e.g., nick, gap, 3'overhang, etc. The strong binding of HU to these diverse DNA structures could explain, in part at least, its pleiotropic role in the bacterial cell. To understand all the facets of its interactions with nucleic acids, it was necessary to develop a procedure which allowed the purification of the three forms of HU under their native form and without the nuclease activity strongly associated with the protein. We describe here such a procedure as well as demonstrating that the three histidine-tagged HUs we have produced, have conserved the binding characteristics of native HUs. Interestingly, by two complementation tests, we show that the histidine-tagged HUs are fully active in vivo.
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Affiliation(s)
- O Pellegrini
- Laboratoire de Physiologie Bactérienne, CNRS, UPR 9073, Institut de Biologie Physico-Chimique, 13, rue Pierre-et-Marie-Curie, 75005, Paris, France
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Zechini B, Cordier L, Ngonseu E, D'Alessandro U, Wery M, Chatterjee S. Plasmodium berghei development in irradiated sporozoite-immunized C57BL6 mice. Parasitology 1999; 118 ( Pt 4):335-8. [PMID: 10340322 DOI: 10.1017/s0031182099003959] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The C57BL6 strain of mice is highly susceptible to Plasmodium berghei sporozoite infections and consequently requires repeated immunizations with irradiated sporozoites to obtain protective immunity. After a live sporozoite challenge in the immunized hosts, hepatic-stage parasites found in the liver after 48 h are of different sizes--small schizonts corresponding to blocked forms (derived from irradiated sporozoites), and schizonts of intermediate size (derived from live sporozoites). Large schizonts corresponding to mature hepatic forms are found only in unimmunized but challenged C57BL6 mice. Using monoclonal and polyclonal antibodies directed to liver-stage parasites, different patterns of binding reactivity to the above forms are observed. More than 20% of the irradiated sporozoites transform into blocked forms after immunization and persist in the liver. Upon sporozoite challenge in such immunized animals the rate of transformation of sporozoites into hepatic parasites is less than 2%. These observations shed light on the fate of live sporozoite development in irradiated sporozoite-immunized C57BL6 mice.
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Affiliation(s)
- B Zechini
- Department of Infectious and Tropical Diseases, Policlinico Umberto I0, Rome, Italy
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Chatterjee S, Druilhe P, Wery M. Irradiated sporozoites prime mice to produce high antibody titres upon viable Plasmodium berghei sporozoite challenge, which act upon liver-stage development. Parasitology 1999; 118 ( Pt 3):219-25. [PMID: 10205797 DOI: 10.1017/s0031182098003825] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
C57BL6 mice were protected against Plasmodium berghei sporozoite challenge by immunization with live 12 krad dose-irradiated sporozoites, but not by 20 krad dose-irradiated sporozoites. Immunization with 12 krad irradiated sporozoites generated low levels of antibody reactive to liver-stage parasites (titres of 1/100). Inoculation of as few as 100 live P. berghei sporozoites induced complete host protection accompanied by a very quick and high boost of antibody titres up to 1/4000. This sporozoite challenge-drive antibody boost was absent in mice immunized by 20 krad sporozoites and in non-protected, and non-immunized mice. Antibody was mainly liver-stage (LS) specific and due to an increase of IgG2a and IgG2b. The in vitro effect of pre- and post-challenge sera upon either sporozoite invasion or LS development was assessed in Hep-G2 cultures. Both were found to have a strong effect upon LS development even at 1/2500 dilution, and conversely a low effect upon invasion. These results suggest that sporozoites irradiated at doses that induce protection are able to prime T-cells which, upon challenge by non-irradiated sporozoites, provide help to B-lymphocytes to trigger the production of high titres of anti-LS antibodies that can inhibit LS development in vitro.
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Affiliation(s)
- S Chatterjee
- Department of Parasitology, Institute of Tropical Medicine, Antwerp, Belgium.
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Ngonseu E, Chatterjee S, Wery M. Blocked hepatic-stage parasites and decreased susceptibility to Plasmodium berghei infections in BALB/c mice. Parasitology 1998; 117 ( Pt 5):419-23. [PMID: 9836306 DOI: 10.1017/s0031182098003333] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The BALB/c strain of mice is comparatively more resistant to sporozoite infections of Plasmodium berghei than the C57BL6 strain. Infection with live sporozoites results in the formation of small hepatic forms in the BALB/c liver that persist for as long as 6 days. Upon infection with small numbers of sporozoites, some of the parasites are destroyed in the liver whereas the rest persist as blocked forms. When larger numbers of sporozoites are injected the same process occurs but, in addition, a fraction of the liver-stage parasites complete full development and give rise to blood forms. Although blocked liver forms persist until day 6 post-infection they actually develop to only 24 h of maturity. The nature of these persistent forms is similar to those obtained from irradiated sporozoite immunization. There is a stronger cell proliferation to liver-stage antigens by spleen lymphocytes of irradiated sporozoite-immunized BALB/c mice in comparison to that of immunized C57BL6 mice suggesting that a stronger priming to liver-stage antigens, probably due to the presence of blocked hepatic forms in the liver for a longer period of time (as compared to C57BL6), occurs in the BALB/c mice. This could be a reason for the long-lasting protective memory observed in BALB/c mice.
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Affiliation(s)
- E Ngonseu
- Department of Parasitology, Institute of Tropical Medicine, Antwerp, Belgium
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15
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Wery M. [Research and control of malaria or adopting easy solutions]. Med Trop (Mars) 1998; 57:241-2. [PMID: 9513147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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16
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Chatterjee S, Wery M, Sharma P, Chauhan VS. A conserved peptide sequence of the Plasmodium falciparum circumsporozoite protein and antipeptide antibodies inhibit Plasmodium berghei sporozoite invasion of Hep-G2 cells and protect immunized mice against P. berghei sporozoite challenge. Infect Immun 1995; 63:4375-81. [PMID: 7591073 PMCID: PMC173622 DOI: 10.1128/iai.63.11.4375-4381.1995] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Minutes after injection into the circulation, malaria sporozoites enter hepatocytes. The speed and specificity of the invasion process suggest that it is receptor mediated. The region II sequence of Plasmodium falciparum circumsporozoite (CS) protein includes a nonapeptide (WSPCSVTCG) which is highly conserved in all of the CS proteins sequenced to data, including the one from Plasmodium berghei. We have found that two peptides based on the P. falciparum region II sequence, P18 (EWSPCSVTCGNGIQVRIK) and P32 (IEQYLKKIKNS ISTEWSPCSVTCGNGIQVRIK), significantly inhibited P. berghei sporozoite invasion into Hep-G2 cells in vitro. This inhibition was enhanced if either peptide was preincubated with Hep-G2 cells prior to sporozoite invasion. We confirm that region II is a sporozoite ligand for the hepatocyte receptor; moreover, despite the few differences between P. falciparum and P. berghei region II sequences around the nonapeptide sequence (66% homology), the functional characteristics of the motif sequences are not affected. Since the conserved motifs represent a crucial sequence involved in Plasmodium sporozoite invasion of hepatocytes, antibodies to region II should inhibit sporozite invasion into hepatocytes. Indeed, we found that polyclonal antibodies generated to the P. falciparum-based peptide P32 inhibited P. berghei sporozoite invasion of Hep-G2 cells. Furthermore, inbred mice (C57BL/6) immunized with P32 were protected against a lethal challenge of P. berghei sporozoites. Our results suggest that the conserved region II of the CS protein contains crucial B- and T-cell epitopes, that such peptide sequences from the human malaria parasite P. falciparum can be screened in the P. berghei rodent model, and, finally, that region II can be considered useful as one of the components of a malaria vaccine.
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Affiliation(s)
- S Chatterjee
- Prince Leopold Institute of Tropical Medicine, Antwerp, Belgium
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Delacollette C, Taelman H, Wery M. An etiologic study of hemoglobinuria and blackwater fever in the Kivu Mountains, Zaire. Ann Soc Belg Med Trop 1995; 75:51-63. [PMID: 7794063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Between January 1985 and March 1986, in the high altitude area of Kivu, Eastern Zaïre, 38 patients presenting with hemoglobinuria as main manifestation were investigated. Profound glucose-6-phosphate dehydrogenase deficiency was detected in 4 patients, leptospirosis in 2 and Hantaan virus infection in 2. Hemolysis was doubtful (haptoglobin > 40 mg/dl, Hemoglobin > 12 g/dl) in 2 patients. Other potential causes of hemoglobinuria such as hemoglobinopathy, toxic agents, infectious diseases or blood transfusion incompatibility were carefully screened and excluded. The syndrome observed in the remaining 28 cases was strongly suggestive of blackwater fever (BWF) as described in malaria patients by several authors under the french name "fièvre bilieuse hémoglobinurique". Quinine was used as curative treatment of malaria before admission in a significant greater proportion (p < 0.01) of patients with BWF compared to patients with uncomplicated malaria, suggesting that this drug might have played a triggering role in the genesis of BWF. However, quinine was usually administered at inadequate doses to malaria patients non responding to chloroquine and belonging to a population of whom 50% are non immune. It may thus also be hypothesized that BWF in our patients could result from a hyperparasitemic state that remained undetected because of an unusual synchronous lysis of infected erythrocytes. In the latter case BWF would correspond to a major complication of falciparum malaria only coincidentally related to the use of quinine.
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Affiliation(s)
- C Delacollette
- Lutte contre les Maladies Transmissibles et Carentielles, Bujumbura, Burundi
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François G, Hendrix L, Wery M. A highly efficient in vitro cloning procedure for asexual erythrocytic forms of the human malaria parasite Plasmodium falciparum. Ann Soc Belg Med Trop 1994; 74:177-85. [PMID: 7840685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A very reliable and productive technique for cloning of Plasmodium falciparum in vitro is proposed, as demonstrated by successive limiting dilution of suspensions of asexual erythrocytic forms of the NF 54 strain. The introduction and the study of reliable clones is of extreme importance for a better understanding of the behaviour of the parasite, also in field conditions. The method is rapid, simple and efficient. The growth of the clones was individually monitored and the culture conditions were constantly adjusted during their stay in recipients of increasing size. A yield of 18/96 (18.75%) of provisional clones was obtained, while the supercloning phase resulted in 16/80 (20%) positive cultures. The probability that the latter were derived from a single progenitor is very high (99%). It was shown that three randomly selected clones (A1A9, A1B11, and A1C10) have excellent growth characteristics before and after cryopreservation, and after a longer period of culture in standard conditions.
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Affiliation(s)
- G François
- Laboratorium voor Protozoölogie, Instituut voor Tropische Geneeskunde, Antwerpen, Belgium
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Dewit I, Coosemans M, Srikrishnaraj K, Wery M. Population dynamics of anophelines in a malathion treated village in the intermediate zone of Sri Lanka. Ann Soc Belg Med Trop 1994; 74:93-103. [PMID: 7944653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
As part of research programme on malaria transmission in Sri Lanka, a study was made of man-biting anophelines at Nikawehera, a village on the border of the intermediate and dry rainfall zones. Weekly mosquito collections by night human bait (NHB) were performed inside and outside four fixed stations from October 1992 till March 1993. Houses in the village were treated with malathion by the Anti-Malaria Campaign in October and at the end of January 1993. An. culicifacies and An. tesselatus were the most abundant species. An. culicifacies was probably the only species responsible for malaria transmission. An. culicifacies densities varied between stations and reflected differences in availability of breeding places. An. culicifacies aggressivity is closely related to the rainfall pattern, increasing after the first monsoon rains in November and reaching a peak in late December--early January. Vectorial capacity, however, decreased during the first weeks of the rainy season. The maximum vectorial capacity was found in January. The night biting cycle of An. culicifacies showed a peak between 20.00 and 23.00 h. Since the introduction of electricity in the village, people go to bed later. This might reduce the impact of impregnated bednets on malaria transmission. The results show that malathion spraying as performed now is not very effective. The timing of the spray rounds should be improved. In order to limit malaria transmission, we suggest to advance the malathion spraying campaign of January with one month.
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Affiliation(s)
- I Dewit
- Institute of Tropical Medicine, Antwerpen, Belgium
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Abstract
Genetic and environmental components of factors contributing in malaria transmission are reviewed. Particular attention is given to density dependent regulation of vector populations in relation to the survival rate of anophelines. The expectation of vector control activities are different according to the epidemiological characteristics of malaria, mainly its stability. In areas with perennial and high transmission (stable malaria) vector control could reduce malaria related morbidity and mortality, without any effect on the endemicity. However this need further investigations. In areas where the transmission period is very short (unstable malaria), vector control will have an important impact on the disease and on the endemicity. Control projects using indoor spraying with insecticide and impregnated bed nets are discussed.
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Affiliation(s)
- M Coosemans
- Institute of Tropical Medicine Prince Leopold, Antwerpen, Belgium
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Abstract
The molecular karyotypes of the African murine malaria parasites P. berghei (3 strains, 2 lines) P. yoeli (2 strains) P. chabaudi (3 strains, 1 line) and P. vinckei (4 strains) have been studied using orthogonal field alternation gel electrophoresis (OFAGE). The genome of each species was resolved into 9 to 11 distinct chromosomal DNA banas molecules of varying intensities which seem to represent 14 chromosomes ranging in size from 600 kb to 3500 kb. The position of certain chromosomes allowed the identification of a unique karyotype for each of the strains and lines under study. P. yoelii appears by criteria of chromosome size, chromosome numbers and localisation of DNA probes to differ considerably from the other three rodent malaria species. The chromosomal location of 5 DNA probes allowed the identification of corresponding chromosomes in rodent malaria parasites and the differentiation between species and strains. Assignment of the "PMMSA" gene of P. c. chabaudi IP-PC 1 enables the distinction of the four rodent malaria species. The molecular karyotype combined to chromosomal assignment of DNA probes provides a useful tool for a more precise characterization by a genetic definition of malaria parasites.
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Van den Ende J, Van den Enden E, Van Gompel A, Wery M. When is fever malaria? Lancet 1992; 339:690; author reply 690-1. [PMID: 1347394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
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Mulumba MP, Wery M, Ngimbi NN, Paluku K, Van der Stuyft P, De Muynck A. [Childhood malaria in Kinshasa (Zaire). Influence of seasons, age, environment, and family social conditions]. Med Trop (Mars) 1990; 50:53-64. [PMID: 2366650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Frequency of malaria in children was evaluated from march 1986 to February 1987 in six districts of Kinshasa by paludometric survey with multiple visits. The six districts were selected according to their geographical situation and their degree of urbanisation. Each month, two stocks of children from 0 to 10 years old dwelling in a street were selected district and visited twice randomization in each selected district and visited twice at 2 weeks of interval. 5,541 children were examined at the occasion of the second visit. Influence of seasons, age, district, socio-economic level of the family and level of education of the parents was determined by analysing the following parameters: plasmodial index, parasitic density, incidence of fever attacks, conversion rate of thick smear, antimalaria drug consumption. Parasitic prevalence is 50 p.c. annual incidence of fever attacks is 50 p.c. and annual frequency of antimalaria drugs is 3,64 per child. Dry seasons (June-September and January-February) ease the pathophoresis and pathogenicity of plasmodia. The age group of less than one year is relatively less parasitized but from 2 years, contact with parasites is very high and without any significant evolution up to 10 years. The district where a child is living plays a predominant role on paludometric indices. Transmission is deeply influenced by geographical situation in the center of the town or in outlying districts and by the socio-economic environment (basic equipment, streets conditions, quality of accommodation). The socio-economic level of the child's family is also important in regard to malaria prevention. The level of education of the parents and mainly the mother has the greatest influence.
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Affiliation(s)
- M P Mulumba
- Laboratoire de Parasitologie Université de Kinshasa, République du Zaïre
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Said A, Wery M. [Complete inhibition of cyclic transmission by immunization against Plasmodium berghei Anka ookinetes]. Ann Parasitol Hum Comp 1989; 64:412-9. [PMID: 2696409 DOI: 10.1051/parasite/1989646412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
An antiserum raised against P. berghei Anka ookinetes binds specifically to ookinetes and zygotes surface as assessed by indirect immunofluorescence. The transmission blocking activity of this serum was assessed by feeding mosquitoes on immunized mice. A serum showing an antibody titer of 1/320 reached after 6 immunizations completely blocks ookinetes development. This immune serum might be used to screen P. berghei genomic or cDNA library in order to identify or clone sequences involved in the process of gametocyte infectivity.
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Affiliation(s)
- A Said
- Laboratoire de Protozoologie, Institut de Médecine Tropicale, Antwerpen, Belgique
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Coulie P, Wery M, Ghys L, Rihoux JP. Pharmacologic modulation by cetirizine-2 HCl of cutaneous reactions and pruritus in man after experimental mosquito bites. Skin Pharmacol 1989; 2:38-40. [PMID: 2576379 DOI: 10.1159/000210800] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- P Coulie
- UCB S.A., Braine-L'Alleud, Belgium
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Chirimwami B, Van Marck EA, Brucher JM, Mulumba P, Wery M, Gigase PL. Light microscopic neuropathology of long-term experimental Trypanosoma brucei gambiense infection in the rat. Ann Soc Belg Med Trop 1988; 68:195-203. [PMID: 3223782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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27
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Chirimwami B, Van Marck EA, Brucher JM, Wery M, Gigase PL. Progression of central nervous system lesions in the rat infected with Trypanosoma brucei gambiense. A light microscopic study. Ann Soc Belg Med Trop 1988; 68:205-18. [PMID: 3223783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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28
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Van der Groen G, Beelaert G, Demets P, Kestens L, Van Overmeir C, Wery M. Line immunoassay: a new serologic test for malaria. Ann Soc Belg Med Trop 1988; 68:37-41. [PMID: 3052325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Affiliation(s)
- P G Janssens
- Prince Leopold Institute of Tropical Medicine, Antwerp, Belgium
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Taelman H, Schechter PJ, Marcelis L, Sonnet J, Kazyumba G, Dasnoy J, Haegele KD, Sjoerdsma A, Wery M. Difluoromethylornithine, an effective new treatment of Gambian trypanosomiasis. Results in five patients. Am J Med 1987; 82:607-14. [PMID: 3103442 DOI: 10.1016/0002-9343(87)90107-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Recent studies have shown DL-alpha-difluoromethylornithine (eflornithine), an inhibitor of polyamine biosynthesis, to be curative in various Trypanosoma species infections of laboratory animals. Five patients are described with Gambian trypanosomiasis treated in Belgium with difluoromethylornithine, using various intravenous and oral dosage schedules. Three patients had late-stage and two had early-stage disease. Difluoromethylornithine treatment was associated with clearing of parasites from blood within one to four days, a trend towards normalization of all altered biologic values associated with the disease, and marked amelioration of clinical symptoms. Side effects of difluoromethylornithine, including loose stools in three patients and both anemia, and a decrease in auditory acuity in one patient, were mild, transient, and never required interruption of drug treatment. The presence of difluoromethylornithine in cerebrospinal fluid, determined in three patients, demonstrated that difluoromethylornithine penetrates into the central nervous system. In three patients, follow-up of at least 24 months after treatment demonstrated a continued healthy state without evidence of relapse. These promising, albeit preliminary, results of difluoromethylornithine therapy, even in patients with central nervous system involvement, indicate that extended clinical trials are warranted to determine the optimal dosage regimen in patients with early- and late-stage disease.
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Demedts P, Vermeulen-Van Overmeir C, Wery M. Simultaneous use of Plasmodium falciparum crude antigen and red blood cell control antigen in the enzyme-linked immunosorbent assay for malaria. Am J Trop Med Hyg 1987; 36:257-63. [PMID: 3548452 DOI: 10.4269/ajtmh.1987.36.257] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
An enzyme-linked immunosorbent assay for malaria, based upon duplicate testing of serum samples on both a crude Plasmodium falciparum antigen and a red blood cell control antigen, is evaluated. Results were analyzed using the Student's t-test for identification of positive serum samples (t greater than or equal to 2.92, P less than or equal to 0.05) and for calculation of the mean difference in absorbance values (delta ABS) obtained between the P. falciparum wells and the control wells. Cross-evaluation with the IFA test for P. falciparum antibodies gave 89.6% concording positive or negative results. Among discrepant sera 8.35% were ELISA+/IFA- and 2.05% ELISA-/IFA+. In addition, delta ABS values in ELISA were highly correlated to titers obtained in immunofluorescence (r = 0.80, P less than 0.001). The results confirm the high degree of species-specificity of the ELISA using P. falciparum crude antigen. The necessity of the simultaneous use of red blood cell control antigen with a crude plasmodial antigen is demonstrated by comparing the presented results with those obtained on the P. falciparum antigen only.
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Nguyen-Dinh P, Schwartz IK, Sexton JD, Egumb B, Bolange B, Ruti K, Nkuku-Pela N, Wery M. In vivo and in vitro susceptibility to chloroquine of Plasmodium falciparum in Kinshasa and Mbuji-Mayi, Zaire. Bull World Health Organ 1985; 63:325-30. [PMID: 3893776 PMCID: PMC2536404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
From April to June 1983, combined in vivo and in vitro studies were conducted to assess the response to chloroquine of Plasmodium falciparum in Kinshasa and Mbuji-Mayi, Zaire. A total of 109 patients were treated with chloroquine, either as a single dose of 10 mg/kg or as a full dose of 25 mg/kg. All patients rapidly cleared their asexual parasitaemia, no recurrence being noted during the subsequent 3 weeks of follow-up. In the fourth week, recurrences were noted in 3 out of 66 patients treated with the full dose of chloroquine and in 10 out of 43 patients treated with the single dose. A total of 101 in vitro tests (30 macro tests, 39 micro tests, and 32 48-hour tests) were successfully performed with blood samples collected from 51 of these patients. Full sensitivity to chloroquine was demonstrated in all but 3 of the successful in vitro tests, the results from these 3 tests being contradicted either by alternative in vitro tests or by the corresponding in vivo findings. These investigations thus failed to detect chloroquine resistance at the level reported in East Africa or eastern Zaire (in Kivu).
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Coosemans M, Wery M, Storme B, Hendrix L, Mfisi B. [Epidemiology of malaria in the plain of Ruzizi, Burundi]. Ann Soc Belg Med Trop 1984; 64:135-58. [PMID: 6486899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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34
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Wery M, Le Ray D. [The place of serology in the diagnosis of diseases caused by protozoa]. Rev Med Brux 1983; 4:201-7. [PMID: 6410480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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35
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Coosemans M, Wery M, Van Marck E, Timperman G. Studies on the infectivity of Plasmodium berghei sporozoites in experimental hosts. Ann Soc Belg Med Trop 1981; 61:349-68. [PMID: 7032427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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36
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Van Marck EA, Beckers A, Deelder AM, Jacob W, Wery M, Gigase PL. Renal disease in chronic experimental Trypanosoma gambiense infections. Am J Trop Med Hyg 1981; 30:780-9. [PMID: 7258490 DOI: 10.4269/ajtmh.1981.30.780] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Two recently isolated stocks of Trypanosoma brucei gambiense of human origin gave rise to a moderate to severe proliferative or membranoproliferative glomerulonephritis in 40 or 44 NMRI and C57BL/6J mice infected for 7-22 weeks. Extensive granular deposits of C3, IgG1 and IgG3 were found in the mesangium, together with smaller quantities of IgG2a, IgG2b, and IgM. No trypanosomal antigen could be detected in the deposits though specific anti-trypanosoma antibodies were found in kidney eluates. By electron microscopy, a conspicuous proliferation of mesangial and endothelial cells was observed and electron-dense deposits were seen in a mesangial and subepithelial localization. With one of these trypanosome stocks, four of seven Wistar rats infected for 9-15 weeks developed morphologically similar glomerular lesions. Four other trypanosome stocks did not evoke renal alterations in 17 other rats infected for 13-56 weeks. Experimental infection in mice or rats appears to be a suitable model for the study of renal disease in chronic African sleeping sickness.
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Fain A, Wery M, Tilkin J. [Transmission of Onchocerca volvulus by Simulium albivirgulatum in the endemic area for onchocercosis of the Central Basin, Zaire]. Ann Soc Belg Med Trop 1981; 61:307-9. [PMID: 7283500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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38
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Wery M, Mojon M, Maertens K. [Pathologic and immunologic manifestations as a function of age in an endemic area for onchocercosis in Zaire]. Ann Soc Belg Med Trop 1981; 61:297-300. [PMID: 7283498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Van Marck EA, Le Ray D, Beckers A, Jacob W, Wery M, Gigase PL. Light and electron microscope studies on extravascular Trypanosoma brucei gambiense in the brain of chronically infected rodents. Ann Soc Belg Med Trop 1981; 61:57-78. [PMID: 7294924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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40
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Mulumba PM, Wery M. [Methods for a more accurate control of the development of experimental trypanosomiasis caused by trypanosoma brucei gambiense in mice]. Ann Soc Belg Med Trop 1981; 61:31-55. [PMID: 7294923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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41
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Fain A, Wery M, Tilkin J. [Simulium albivirgulatum Wanson et Henrard, 1944, vector of Onchocerca volvulus, in the Central Basin region of Zaire. Preliminary note]. Ann Soc Belg Med Trop 1980; 60:285-9. [PMID: 7247516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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42
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Wery M, Coosemans M. [Drug resistance in malaria]. Ann Soc Belg Med Trop 1980; 60:137-62. [PMID: 7018421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Ngimbi NP, Wery M, Timperman G, Hendrix L, Peeters-de Ruysser F. [The infectivity of Plasmodium berghei sporozoites during laboratory manipulation]. Ann Soc Belg Med Trop 1979; 59:237-50. [PMID: 391163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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44
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Wery M, Van Wettere P. [Epidemiology in a hyperendemic region of sleeping sickness (T. gambiense) in the region of Kasongo]. Ann Parasitol Hum Comp 1973; 48:429-32. [PMID: 4595620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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45
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Wery-Paskoff S, Bastin JP, Wery M, Ruiz-Avuzo P. [Detection of amoebas by immunofluorescence on tissue sections fixed and embedded in paraffin]. Bull Soc Pathol Exot Filiales 1972; 65:276-81. [PMID: 4565391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Wery M, Burke J. Human "healthy carriers" of Trypanosoma (brucei type) discovered by immunofluorescence test in the Republique Democratique du Congo. Trans R Soc Trop Med Hyg 1972; 66:332-3. [PMID: 4558826 DOI: 10.1016/0035-9203(72)90209-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Wery M, Kayembe D. Morphology of the parasites and the pathological changes in the brain of albino rats infected with Trypanosoma gambiense. Trans R Soc Trop Med Hyg 1971; 65:409-11. [PMID: 5559761 DOI: 10.1016/0035-9203(71)90031-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Jadin J, Wery M, Falaise A, Gillet P, Deneve V, Verbeeck J. [A new active polyvalent compound in microbial and parasitic dysenteries]. Presse Med (1893) 1967; 75:1125-6. [PMID: 6026026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Jadin J, Vincke IH, Dunjic A, Delville JP, Wery M, Bafort J, Scheepers-Biva M. [Role of Pseudomonas in the sporogenesis of the hematozoon of malaria in the mosquito]. Bull Soc Pathol Exot Filiales 1966; 59:514-25. [PMID: 6014213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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