Imperial College London

Joanne P. Webster

Faculty of MedicineSchool of Public Health

Visiting Professor
 
 
 
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Contact

 

joanne.webster Website

 
 
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Location

 

Medical SchoolSt Mary's Campus

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Summary

 

Publications

Publication Type
Year
to

257 results found

Lu D-B, Yu Q-F, Zhang J-Y, Sun M-T, Gu M-M, Webster JP, Liang Y-Set al., 2021, Extended survival and reproductive potential of single-sex male and female Schistosoma japonicum within definitive hosts, INTERNATIONAL JOURNAL FOR PARASITOLOGY, Vol: 51, Pages: 887-891, ISSN: 0020-7519

Journal article

Yu Q-F, Zhang J-Y, Sun M-T, Gu M-M, Zou H-Y, Webster JP, Lu D-Bet al., 2021, <i>In</i><i> vivo</i> praziquantel efficacy of<i> Schistosoma</i><i> japonicum</i> over time: A systematic review and meta-analysis, ACTA TROPICA, Vol: 222, ISSN: 0001-706X

Journal article

Fall CB, Lambert S, Leger E, Yasenev L, Garba AD, Diop SD, Borlase A, Catalano S, Faye B, Walker M, Sene M, Webster JPet al., 2021, Hybridized zoonotic schistosoma infections result in hybridized morbidity profiles: a clinical morbidity study amongst co-infected human populations of Senegal, Microorganisms, Vol: 9, Pages: 1-18, ISSN: 2076-2607

Hybridization of infectious agents is a major emerging public and veterinary health concern at the interface of evolution, epidemiology, and control. Whilst evidence of the extent of hybridization amongst parasites is increasing, their impact on morbidity remains largely unknown. This may be predicted to be particularly pertinent where parasites of animals with contrasting pathogenicity viably hybridize with human parasites. Recent research has revealed that viable zoonotic hybrids between human urogenital Schistosoma haematobium with intestinal Schistosoma species of livestock, notably Schistosoma bovis, can be highly prevalent across Africa and beyond. Examining human populations in Senegal, we found increased hepatic but decreased urogenital morbidity, and reduced improvement following treatment with praziquantel, in those infected with zoonotic hybrids compared to non-hybrids. Our results have implications for effective monitoring and evaluation of control programmes, and demonstrate for the first time the potential impact of parasite hybridizations on host morbidity.

Journal article

Berger DJ, Crellen T, Lamberton PHL, Allan F, Tracey A, Noonan JD, Kabatereine NB, Tukahebwa EM, Adriko M, Holroyd N, Webster JP, Berriman M, Cotton JAet al., 2021, Whole-genome sequencing of <i>Schistosoma mansoni</i> reveals extensive diversity with limited selection despite mass drug administration, NATURE COMMUNICATIONS, Vol: 12

Journal article

Le Clech W, Chevalier FD, Mattos ACA, Strickland A, Diaz R, McDew-White M, Rohr CM, Kinunghi S, Allan F, Webster BL, Webster JP, Emery AM, Rollinson D, Djirmay AG, Al Mashikhi KM, Yafae SA, Idris MA, Moné H, Mouahid G, LoVerde P, Marchant JS, Anderson TJCet al., 2021, Genetic analysis of praziquantel response in schistosome parasites implicates a Transient Receptor Potential channel

<jats:title>Abstract</jats:title><jats:p>Mass treatment with praziquantel (PZQ) monotherapy is the mainstay for schistosomiasis treatment. This drug shows imperfect cure rates in the field and parasites showing reduced PZQ response can be selected in the laboratory, but the extent of resistance in <jats:italic>Schistosoma mansoni</jats:italic> populations is unknown. We examined the genetic basis of variation in PZQ response in a <jats:italic>S. mansoni</jats:italic> population (SmLE-PZQ-R) selected with PZQ in the laboratory: 35% of these worms survive high dose (73 µg/mL) PZQ treatment. We used genome wide association to map loci underlying PZQ response. The major chr. 3 peak contains a transient receptor potential (<jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic>) channel (Smp_246790), activated by nanomolar concentrations of PZQ. PZQ response shows recessive inheritance and marker-assisted selection of parasites at a single <jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic> SNP enriched populations of PZQ-resistant (PZQ-ER) and sensitive (PZQ-ES) parasites showing &gt;377 fold difference in PZQ response. The PZQ-ER parasites survived treatment in rodents better than PZQ-ES. Resistant parasites show 2.25-fold lower expression of <jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic> than sensitive parasites. Specific chemical blockers of <jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic> enhanced PZQ resistance, while <jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic> activators increased sensitivity. A single SNP in <jats:italic>Sm.TRPM<jats:sub>PZQ</jats:sub></jats:italic> differentiated PZQ-ER and PZQ-ES lines, but mutagenesis showed this was not involved in PZQ-response, suggesting linked regulatory changes. We surveyed <jats:

Journal article

Neves MI, Gower CM, Webster JP, Walker Met al., 2021, Revisiting density-dependent fecundity in schistosomes using sibship reconstruction., PLoS Neglected Tropical Diseases, Vol: 15, Pages: 1-16, ISSN: 1935-2727

The stability of parasite populations is regulated by density-dependent processes occurring at different stages of their life cycle. In dioecious helminth infections, density-dependent fecundity is one such regulatory process that describes the reduction in egg production by female worms in high worm burden within-host environments. In human schistosomiasis, the operation of density-dependent fecundity is equivocal and investigation is hampered by the inaccessibility of adult worms that are located intravascularly. Current understanding is almost exclusively limited to data collected from two human autopsy studies conducted over 40 years ago, with subsequent analyses having reached conflicting conclusions. Whether egg production is regulated in a density-dependent manner is key to predicting the effectiveness of interventions targeting the elimination of schistosomiasis and to the interpretation of parasitological data collected during monitoring and evaluation activities. Here, we revisit density-dependent fecundity in the two most globally important human Schistosoma spp. using a statistical modelling approach that combines molecular inference on the number of parents/adult worms in individual human hosts with parasitological egg count data from mainland Tanzania and Zanzibar. We find a non-proportional relationship between S. haematobium egg counts and inferred numbers of female worms, providing the first clear evidence of density-dependent fecundity in this schistosome species. We do not find robust evidence for density-dependent fecundity in S. mansoni because of high sensitivity to some modelling assumptions and the lower statistical power of the available data. We discuss the strengths and limitations of our model-based analytical approach and its potential for improving our understanding of density dependence in schistosomiasis and other human helminthiases earmarked for elimination.

Journal article

Mawa PA, Kincaid-Smith J, Tukahebwa EM, Webster JP, Wilson Set al., 2021, Schistosomiasis morbidity hotspots: roles of the human host, the parasite and their interface in the Development of severe morbidity, Frontiers in Immunology, Vol: 12, ISSN: 1664-3224

Schistosomiasis is the second most important human parasitic disease in terms of socioeconomic impact, causing great morbidity and mortality, predominantly across the African continent. For intestinal schistosomiasis, severe morbidity manifests as periportal fibrosis (PPF) in which large tracts of macro-fibrosis of the liver, visible by ultrasound, can occlude the main portal vein leading to portal hypertension (PHT), sequelae such as ascites and collateral vasculature, and ultimately fatalities. For urogenital schistosomiasis, severe morbidity manifests as pathology throughout the urinary system and genitals, and is a definitive cause of squamous cell bladder carcinoma. Preventative chemotherapy (PC) programmes, delivered through mass drug administration (MDA) of praziquantel (PZQ), have been at the forefront of schistosomiasis control programmes in sub-Saharan Africa since their commencement in Uganda in 2003. However, despite many successes, 'biological hotspots' (as distinct from 'operational hotspots') of both persistent high transmission and morbidity remain. In some areas, this failure to gain control of schistosomiasis has devastating consequences, with not only persistently high infection intensities, but both "subtle" and severe morbidity remaining prevalent. These hotspots highlight the requirement to revisit research into severe morbidity and its mechanisms, a topic that has been out of favor during times of PC implementation. Indeed, the focality and spatially-structured epidemiology of schistosomiasis, its transmission persistence and the morbidity induced, has long suggested that gene-environmental-interactions playing out at the host-parasite interface are crucial. Here we review evidence of potential unique parasite factors, host factors, and their gene-environmental interactions in terms of explaining differential morbidity profiles in the human host. We then take the situation of schistosomiasis mansoni within the Albertin

Journal article

Jones BP, Norman BF, Borrett HE, Attwood SW, Mondal MMH, Walker AJ, Webster JP, Rajapakse RPVJ, Lawton SPet al., 2021, Author Correction: Divergence across mitochondrial genomes of sympatric members of the Schistosoma indicum group and clues into the evolution of Schistosoma spindale., Sci Rep, Vol: 11

Journal article

Levecke B, Vlaminck J, Andriamaro L, Ame S, Belizario V, Degarege A, Engels D, Erko B, Garba AD, Kaatano GM, Mekonnen Z, Montresor A, Olliaro P, Pieri OS, Sacko M, Sam-Wobo SO, Tchuente LAT, Webster JP, Vercruysse Jet al., 2020, Evaluation of the therapeutic efficacy of praziquantel against schistosomes in seven countries with ongoing large-scale deworming programs, INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE, Vol: 14, Pages: 183-187, ISSN: 2211-3207

Journal article

Milne G, Webster JP, Walker M, 2020, <i>Toxoplasma gondii</i>: An Underestimated Threat?, TRENDS IN PARASITOLOGY, Vol: 36, Pages: 959-969, ISSN: 1471-4922

Journal article

Namsanor J, Pitaksakulrat O, Kopolrat K, Kiatsopit N, Webster BL, Gower CM, Webster JP, Laha T, Saijuntha W, Laoprom N, Andrews RH, Petney TN, Blair D, Sithithaworn Pet al., 2020, Impact of geography and time on genetic clusters of Opisthorchis viverrini identified by microsatellite and mitochondrial DNA analysis, INTERNATIONAL JOURNAL FOR PARASITOLOGY, Vol: 50, Pages: 1133-1144, ISSN: 0020-7519

Journal article

Milne G, Webster JP, Walker M, 2020, Towards improving interventions against toxoplasmosis by identifying routes of transmission using sporozoite-specific serological tools., Clinical Infectious Diseases, Vol: 71, Pages: e686-e693, ISSN: 1058-4838

BACKGROUND: Horizontal transmission of Toxoplasma gondii occurs primarily via ingestion of environmental oocysts or consumption of undercooked/raw meat containing cyst-stage bradyzoites. The relative importance of these two transmission routes remains unclear. Oocyst infection can be distinguished from bradyzoite infection by identification of IgG antibodies against T. gondii-embryogenesis-related protein (TgERP). These antibodies are, however, thought to persist for only 6-8 months in human sera, limiting the use of TgERP serology to only those patients recently exposed to T. gondii. Yet recent serological survey data indicate a more sustained persistence of anti-TgERP antibodies. Elucidating the duration of anti-TgERP IgG will help to determine whether TgERP serology has epidemiological utility for quantifying the relative importance of different routes of T. gondii transmission. METHODS: We developed a sero-catalytic mathematical model to capture the change in seroprevalence of non-stage-specific IgG and anti-TgERP IgG antibodies with human age. The model was fitted to published datasets collected in an endemic region of Brazil to estimate the duration of anti-TgERP IgG antibodies, accounting for variable age-force of infection profiles and uncertainty in the diagnostic performance of TgERP serology. RESULTS: We found that anti-TgERP IgG persists for substantially longer than previously recognised, with estimates ranging from 8.3 to 41.1 years. The Brazilian datasets were consistent with oocysts being the predominant transmission route in these settings. CONCLUSIONS: The longer than previously recognised duration of anti-TgERP antibodies indicates that anti-TgERP serology could be a useful tool for delineating T. gondii transmission routes in human populations. TgERP serology may therefore be an important epidemiological tool for informing the design of tailored, setting-specific public health information campaigns and interventions.

Journal article

Easton A, Gao S, Lawton SP, Bennuru S, Khan A, Dahlstrom E, Oliveira RG, Kepha S, Porcella SF, Webster J, Anderson R, Grigg ME, Davis RE, Wang J, Nutman TBet al., 2020, Molecular evidence of hybridization between pig and human Ascaris indicates an interbred species complex infecting humans, eLife, Vol: 9, ISSN: 2050-084X

Human ascariasis is a major neglected tropical disease caused by the nematode Ascaris lumbricoides. We report a 296 megabase (Mb) reference-quality genome comprised of 17,902 protein-coding genes derived from a single, representative Ascaris worm. An additional 68 worms were collected from 60 human hosts in Kenyan villages where pig husbandry is rare. Notably, the majority of these worms (63/68) possessed mitochondrial genomes that clustered closer to the pig parasite Ascaris suum than to A. lumbricoides. Comparative phylogenomic analyses identified over 11 million nuclear-encoded SNPs but just two distinct genetic types that had recombined across the genomes analyzed. The nuclear genomes had extensive heterozygosity, and all samples existed as genetic mosaics with either A. suum-like or A. lumbricoides-like inheritance patterns supporting a highly interbred Ascaris species genetic complex. As no barriers appear to exist for anthroponotic transmission of these 'hybrid' worms, a one-health approach to control the spread of human ascariasis will be necessary.

Journal article

Milne G, Fujimoto C, Bean T, Peters HJ, Hemmington M, Taylor C, Fowkes RC, Martineau HM, Hamilton CM, Walker M, Mitchell JA, Leger E, Priestnall SL, Webster JPet al., 2020, Infectious causation of abnormal host behavior: toxoplasma gondiiand Its potential association with dopey fox syndrome, Frontiers in Psychiatry, Vol: 11, Pages: 1-16, ISSN: 1664-0640

The apicomplexan parasite Toxoplasma gondii, the causative agent of toxoplasmosis, can infect all warm-blooded animals. T. gondii can subtly alter host behaviors—either through manipulation to enhance transmission to the feline definitive host or as a side-effect, or “constraint,” of infection. In humans, T. gondii infection, either alone or in association with other co-infecting neurotropic agents, has been reliably associated with both subtle behavioral changes and, in some cases, severe neuropsychiatric disorders, including schizophrenia. Research on the potential impact of T. gondii on the behavior of other long-lived naturally infected hosts is lacking. Recent studies reported a large number of wild red foxes exhibiting a range of aberrant behavioral traits, subsequently classified as Dopey Fox Syndrome (DFS). Here we assessed the potential association between T. gondii and/or other neurotropic agents with DFS. Live, captive foxes within welfare centers were serologically tested for T. gondii and, if they died naturally, PCR-tested for vulpine circovirus (FoxCV). Post-mortem pseudo-control wild foxes, obtained from pest management companies, were PCR-tested for T. gondii, FoxCV, canine distemper virus (CDV), canine adenovirus type (CAV)-1 and CAV-2. We also assessed, using non-invasive assays, whether T. gondii–infected foxes showed subtle behavioral alterations as observed among infected rodent (and other) hosts, including altered activity, risk, and stress levels. All foxes tested negative for CAV, CDV, CHV, and DogCV. DFS was found to be associated with singular T. gondii infection (captives vs. pseudo-controls, 33.3% (3/9) vs. 6.8% (5/74)) and singular FoxCV infection (66.7% (6/9) vs. 11.1% (1/9)) and with T. gondii/FoxCV co-infection (33.3% (3/9) vs. 11.1% (1/9)). Overall, a higher proportion of captive foxes had signs of neuroinflammation compared to pseudo-controls (66.7% (4/6) vs. 11.1% (1/9)). Consistent with behavioral changes

Journal article

Zou H-Y, Yu Q-F, Qiu C, Webster JP, Lu D-Bet al., 2020, Meta-analyses of <i>Schistosoma japonicum</i> infections in wild rodents across China over time indicates a potential challenge to the 2030 elimination targets, PLOS NEGLECTED TROPICAL DISEASES, Vol: 14, ISSN: 1935-2735

Journal article

Léger E, Borlase A, Fall CB, Diouf ND, Diop SD, Yasenev L, Catalano S, Thiam CT, Ndiaye A, Emery A, Morrell A, Rabone M, Ndao M, Faye B, Rollinson D, Rudge JW, Sène M, Webster JPet al., 2020, Prevalence and distribution of schistosomiasis in human, livestock, and snail populations in northern Senegal: a One Health epidemiological study of a multi-host system., The Lancet Planetary Health, Vol: 4, Pages: e330-e342, ISSN: 2542-5196

BACKGROUND: Schistosomiasis is a neglected tropical disease of global medical and veterinary importance. As efforts to eliminate schistosomiasis as a public health problem and interrupt transmission gather momentum, the potential zoonotic risk posed by livestock Schistosoma species via viable hybridisation in sub-Saharan Africa have been largely overlooked. We aimed to investigate the prevalence, distribution, and multi-host, multiparasite transmission cycle of Haematobium group schistosomiasis in Senegal, West Africa. METHODS: In this epidemiological study, we carried out systematic surveys in definitive hosts (humans, cattle, sheep, and goats) and snail intermediate hosts, in 2016-18, in two areas of Northern Senegal: Richard Toll and Lac de Guiers, where transmission is perennial; and Barkedji and Linguère, where transmission is seasonal. The occurrence and distribution of Schistosoma species and hybrids were assessed by molecular analyses of parasitological specimens obtained from the different hosts. Children in the study villages aged 5-17 years and enrolled in school were selected from school registers. Adults (aged 18-78 years) were self-selecting volunteers. Livestock from the study villages in both areas were also randomly sampled, as were post-mortem samples from local abattoirs. Additionally, five malacological surveys of snail intermediate hosts were carried out at each site in open water sources used by the communities and their animals. FINDINGS: In May to August, 2016, we surveyed 375 children and 20 adults from Richard Toll and Lac de Guiers, and 201 children and 107 adults from Barkedji and Linguère; in October, 2017, to January, 2018, we surveyed 386 children and 88 adults from Richard Toll and Lac de Guiers, and 323 children and 85 adults from Barkedji and Linguère. In Richard Toll and Lac de Guiers the prevalence of urogenital schistosomiasis in children was estimated to be 87% (95% CI 80-95) in 2016 and 88% (82-95) in 2017-

Journal article

Webster JP, Neves MI, Webster BL, Pennance T, Rabone M, Gouvras AN, Allan F, Walker M, Rollinson Det al., 2020, Parasite population genetic contributions to the schistosomiasis consortium for operational research and evaluation within Sub-Saharan Africa, American Journal of Tropical Medicine and Hygiene, Vol: 103, Pages: 80-91, ISSN: 0002-9637

Analyses of the population genetic structure of schistosomes under the “Schistosomiasis Consortium for Operational Research and Evaluation” (SCORE) contrasting treatment pressure scenarios in Tanzania, Niger, and Zanzibar were performed to provide supplementary critical information with which to evaluate the impact of these large-scale control activities and guide how activities could be adjusted. We predicted that population genetic analyses would reveal information on a range of important parameters including, but not exclusive to, recruitment and transmission of genotypes, occurrence of hybridization events, differences in reproductive mode, and degrees of inbreeding, and hence, the evolutionary potential, and responses of parasite populations under contrasting treatment pressures. Key findings revealed that naturally high levels of gene flow and mixing of the parasite populations between neighboring sites were likely to dilute any effects imposed by the SCORE treatment arms. Furthermore, significant inherent differences in parasite fecundity were observed, independent of current treatment arm, but potentially of major impact in terms of maintaining high levels of ongoing transmission in persistent “biological hotspot” sites. Within Niger, naturally occurring Schistosoma haematobium/Schistosoma bovis viable hybrids were found to be abundant, often occurring in significantly higher proportions than that of single-species S. haematobium infections. By examining parasite population genetic structures across hosts, treatment regimens, and the spatial landscape, our results to date illustrate key transmission processes over and above that which could be achieved through standard parasitological monitoring of prevalence and intensity alone, as well as adding to our understanding of Schistosoma spp. life history strategies in general.

Journal article

Catalano S, Léger E, Fall CB, Borlase A, Diop SD, Berger D, Webster BL, Faye B, Diouf ND, Rollinson D, Sène M, Bâ K, Webster JPet al., 2020, Multihost transmission of Schistosoma mansoni in Senegal, 2015-2018., Emerging Infectious Diseases, Vol: 26, Pages: 1234-1242, ISSN: 1080-6040

In West Africa, Schistosoma spp. are capable of infecting multiple definitive hosts, a lifecycle feature that may complicate schistosomiasis control. We characterized the evolutionary relationships among multiple Schistosoma mansoni isolates collected from snails (intermediate hosts), humans (definitive hosts), and rodents (definitive hosts) in Senegal. On a local scale, diagnosis of S. mansoni infection ranged 3.8%-44.8% in school-aged children, 1.7%-52.6% in Mastomys huberti mice, and 1.8%-7.1% in Biomphalaria pfeifferi snails. Our phylogenetic framework confirmed the presence of multiple S. mansoni lineages that could infect both humans and rodents; divergence times of these lineages varied (0.13-0.02 million years ago). We propose that extensive movement of persons across West Africa might have contributed to the establishment of these various multihost S. mansoni clades. High S. mansoni prevalence in rodents at transmission sites frequented by humans further highlights the implications that alternative hosts could have on future public health interventions.

Journal article

Pennance T, Allan F, Emery A, Rabone M, Cable J, Garba AD, Hamidou AA, Webster JP, Rollinson D, Webster BLet al., 2020, Interactions between <i>Schistosoma haematobium</i> group species and their <i>Bulinus</i> spp. intermediate hosts along the Niger River Valley, PARASITES & VECTORS, Vol: 13, ISSN: 1756-3305

Journal article

Easton AV, Gao S, Lawton SP, Bennuru S, Khan A, Dahlstrom E, Oliveira RG, Kepha S, Porcella SF, Webster JP, Anderson RM, Grigg ME, Davis RE, Wang J, Nutman TBet al., 2020, Extensive hybridization between pig and human<i>Ascaris</i>identifies a highly interbred species complex infecting humans

<jats:title>Abstract</jats:title><jats:p>Human ascariasis is a major neglected tropical disease caused by the nematode<jats:italic>Ascaris lumbricoides</jats:italic>. We report a 296 megabase (Mb) reference quality genome comprised of 17902 protein-coding genes derived from a single, representative<jats:italic>Ascaris</jats:italic>worm collected from 60 human hosts in Kenyan villages where pig husbandry is rare. Notably, the majority of human isolates (63/68) possessed mitochondrial genomes that clustered closer to the pig parasite<jats:italic>Ascaris suum</jats:italic>than to<jats:italic>A. lumbricoides</jats:italic>. Comparative phylogenomic analyses identified over 11 million nuclear-encoded SNPs but just two distinct genetic types that had recombined across the genomes analysed. The nuclear genomes had extensive heterozygosity and all samples existed as genetic mosaics with either<jats:italic>A. suum</jats:italic>-like or<jats:italic>A. lumbricoides</jats:italic>-like inheritance patterns supporting a highly interbred<jats:italic>Ascaris</jats:italic>species genetic complex. As no barriers appear to exist for anthroponotic transmission of these “hybrid” worms, a one-health approach to control the spread of human ascariasis will be necessary.</jats:p>

Journal article

Wang W, Yang K, 2020, Schistosomiasis and the Global Goals, NEW ENGLAND JOURNAL OF MEDICINE, Vol: 382, Pages: 1575-1576, ISSN: 0028-4793

Journal article

Jones BP, Norman BF, Borrett HE, Attwood SW, Mondal MMH, Walker AJ, Webster JP, Jayanthe Rajapakse PRV, Lawton SPet al., 2020, Divergence across mitochondrial genomes of sympatric members of the Schistosoma indicum group and clues into the evolution of Schistosoma spindale, Scientific Reports, Vol: 10, ISSN: 2045-2322

Schistosoma spindale and Schistosoma indicum are ruminant-infecting trematodes of the Schistosoma indicum group that are widespread across Southeast Asia. Though neglected, these parasites can cause major pathology and mortality to livestock leading to significant welfare and socio-economic issues, predominantly amongst poor subsistence farmers and their families. Here we used mitogenomic analysis to determine the relationships between these two sympatric species of schistosome and to characterise S. spindale diversity in order to identify possible cryptic speciation. The mitochondrial genomes of S. spindale and S. indicum were assembled and genetic analyses revealed high levels of diversity within the S. indicum group. Evidence of functional changes in mitochondrial genes indicated adaptation to environmental change associated with speciation events in S. spindale around 2.5 million years ago. We discuss our results in terms of their theoretical and applied implications.

Journal article

Faust CL, Crotti M, Moses A, Oguttu D, Wamboko A, Adriko M, Adekanle EK, Kabatereine N, Tukahebwa EM, Norton AJ, Gower CM, Webster JP, Lamberton PHLet al., 2019, Two-year longitudinal survey reveals high genetic diversity of <i>Schistosoma mansoni</i> with adult worms surviving praziquantel treatment at the start of mass drug administration in Uganda, PARASITES & VECTORS, Vol: 12, ISSN: 1756-3305

Journal article

Deol AK, Fleming FM, Calvo-Urbano B, Walker M, Bucumi V, Gnandou I, Tukahebwa EM, Jemu S, Mwingira UJ, Alkohlani A, Traore M, Ruberanziza E, Toure S, Basanez M-G, French MD, Webster JPet al., 2019, Schistosomiasis — assessing progress toward the 2020 and 2025 global goals, New England Journal of Medicine, Vol: 381, Pages: 2519-2528, ISSN: 0028-4793

BackgroundWith the vision of “a world free of schistosomiasis,” the World Health Organization (WHO) set ambitious goals of control of this debilitating disease and its elimination as a public health problem by 2020 and 2025, respectively. As these milestones become imminent, and if programs are to succeed, it is important to evaluate the WHO programmatic guidelines empirically.MethodsWe collated and analyzed multiyear cross-sectional data from nine national schistosomiasis control programs (in eight countries in sub-Saharan Africa and in Yemen). Data were analyzed according to schistosome species (Schistosoma mansoni or S. haematobium), number of treatment rounds, overall prevalence, and prevalence of heavy-intensity infection. Disease control was defined as a prevalence of heavy-intensity infection of less than 5% aggregated across sentinel sites, and the elimination target was defined as a prevalence of heavy-intensity infection of less than 1% in all sentinel sites. Heavy-intensity infection was defined as at least 400 eggs per gram of feces for S. mansoni infection or as more than 50 eggs per 10 ml of urine for S. haematobium infection.ResultsAll but one country program (Niger) reached the disease-control target by two treatment rounds or less, which is earlier than projected by current WHO guidelines (5 to 10 years). Programs in areas with low endemicity levels at baseline were more likely to reach both the control and elimination targets than were programs in areas with moderate and high endemicity levels at baseline, although the elimination target was reached only for S. mansoni infection (in Burkina Faso, Burundi, and Rwanda within three treatment rounds). Intracountry variation was evident in the relationships between overall prevalence and heavy-intensity infection (stratified according to treatment rounds), a finding that highlights the challenges of using one metric to define control or elimination across all epidemiologic settings.Conclusio

Journal article

Wood CL, Sokolow SH, Jones IJ, Chamberlin AJ, Lafferty KD, Kuris AM, Jocque M, Hopkins S, Adams G, Buck JC, Lund AJ, Garcia-Vedrenne AE, Fiorenza E, Rohr JR, Allan F, Webster B, Rabone M, Webster JP, Bandagny L, Ndione R, Senghor S, Schacht A-M, Jouanard N, Riveau G, De Leo GAet al., 2019, Precision mapping of snail habitat provides a powerful indicator of human schistosomiasis transmission, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 116, Pages: 23182-23191, ISSN: 0027-8424

Journal article

Mutombo N, Landoure A, Man WY, Fenwick A, Dembele R, Sacko M, Keita AD, Traore MS, Webster JP, McLaws M-Let al., 2019, The association between child <i>Schistosoma</i> spp. infections and morbidity in an irrigated rice region in Mali: A localized study, ACTA TROPICA, Vol: 199, ISSN: 0001-706X

Journal article

Platt RN, McDew-White M, Le Clec'h W, Chevalier F, Allan F, Emery AM, Garba A, Hamidou AA, Ame SM, Webster JP, Rollinson D, Webster BL, Anderson TJCet al., 2019, Ancient Hybridization and Adaptive Introgression of an Invadolysin Gene in Schistosome Parasites, MOLECULAR BIOLOGY AND EVOLUTION, Vol: 36, Pages: 2127-2142, ISSN: 0737-4038

Journal article

Chevalier FD, Le Clec'h W, McDew-White M, Menon V, Guzman MA, Holloway SP, Cao X, Taylor AB, Kinung'hi S, Gouvras AN, Webster BL, Webster JP, Emery AM, Rollinson D, Garba Djirmay A, Al Mashikhi KM, Al Yafae S, Idris MA, Mone H, Mouahid G, Hart PJ, LoVerde PT, Anderson TJCet al., 2019, Oxamniquine resistance alleles are widespread in Old World <i>Schistosoma mansoni</i> and predate drug deployment, PLOS PATHOGENS, Vol: 15, ISSN: 1553-7366

Journal article

Doyle SR, Sankaranarayanan G, Allan F, Berger D, Jimenez Castro PD, Collins JB, Crellen T, Duque-Correa MA, Ellis P, Jaleta TG, Laing R, Maitland K, McCarthy C, Moundai T, Softley B, Thiele E, Ouakou PT, Tushabe JV, Webster JP, Weiss AJ, Lok J, Devaney E, Kaplan RM, Cotton JA, Berriman M, Holroyd Net al., 2019, Evaluation of DNA Extraction Methods on Individual Helminth Egg and Larval Stages for Whole-Genome Sequencing, FRONTIERS IN GENETICS, Vol: 10

Journal article

Neves MI, Webster JP, Walker M, 2019, Estimating helminth burdens using sibship reconstruction, PARASITES & VECTORS, Vol: 12, ISSN: 1756-3305

Journal article

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