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Interaction Between Duddingtonia flagrans and Pochonia chlamydosporia for the Biological of Bovine Gastrointestinal Nematodes
Maria Larissa Bitencourt Vidal
,Júlia dos Santos Fonseca
,Ítalo Stoupa Vieira
,Lorena Castro Altoé
,Lorendane Millena de Carvalho
,Wagner Nunes Rodrigues
,Isabella Vilhena Freire Martins
,Jackson Victor Araújo
Gastrointestinal nematodes are among the most significant parasites affecting liverstock health and productivity, leading to major economic losses and contributing to the global increase in resistance to anthelmintics. Biological control using fungi with ovicidal and nematophagous activity offers an environmentally friendly alternative. This study investigated, for the first time, the interactive effects between the nematophagous/larvicidal fungus Duddingtonia flagrans and the ovicidal fungus Pochonia chlamydosporia under natural infection conditions. Eighteen Holstein × Zebu males (12–15 months old) were divided into three groups (n = 6): T1 (D. flagrans), T2 (D. flagrans + P. chlamydosporia), and control. Treatments were administered orally daily (6 g/100 kg BW of each fungus; 10⁶ chlamydospores/g) for nine months. Faecal egg counts (EPG) and infective larvae in pasture (L3) were monitored. Groups T1 and T2 showed significantly lower EPG values than the control during most of the experimental period. Haemonchus spp. was identified as the predominant nematode, confirming its epidemiological relevance. The combined fungal treatment exhibited synergistic activity, enhancing parasite suppression through complementary ovicidal and larvicidal mechanisms. This approach proposes a sustainable and reproducible alternative to the excessive use of chemical compounds, contributing innovative and applicable solutions to national livestock production and integrated animal health.
Gastrointestinal nematodes are among the most significant parasites affecting liverstock health and productivity, leading to major economic losses and contributing to the global increase in resistance to anthelmintics. Biological control using fungi with ovicidal and nematophagous activity offers an environmentally friendly alternative. This study investigated, for the first time, the interactive effects between the nematophagous/larvicidal fungus Duddingtonia flagrans and the ovicidal fungus Pochonia chlamydosporia under natural infection conditions. Eighteen Holstein × Zebu males (12–15 months old) were divided into three groups (n = 6): T1 (D. flagrans), T2 (D. flagrans + P. chlamydosporia), and control. Treatments were administered orally daily (6 g/100 kg BW of each fungus; 10⁶ chlamydospores/g) for nine months. Faecal egg counts (EPG) and infective larvae in pasture (L3) were monitored. Groups T1 and T2 showed significantly lower EPG values than the control during most of the experimental period. Haemonchus spp. was identified as the predominant nematode, confirming its epidemiological relevance. The combined fungal treatment exhibited synergistic activity, enhancing parasite suppression through complementary ovicidal and larvicidal mechanisms. This approach proposes a sustainable and reproducible alternative to the excessive use of chemical compounds, contributing innovative and applicable solutions to national livestock production and integrated animal health.
Posted: 03 December 2025
Decoding Malaria: An African Perspective of the Journey from Microscopy to Genomics
Adejoke Onaolapo
,Olakunle Onaolapo
Posted: 21 October 2025
Identification of the Genes daf-12, sdc-2, and sex-1 Associated with Sexual Differentiation of Haemonchus contortus
Selina Montes de Oca
,Hugo Aguilar-Díaz
,Yazmin Alcala-Canto
,Fernando Alba-Hurtado
,Cesar Cuenca-Verde
,Ixchel Guadalupe Díaz-Esquivel
,Melodía Rubí Castro-Pérez
,Víctor Hugo Del Río-Araiza
Posted: 17 October 2025
Sand and Common Lizards (Lacerta agilis and Zootoca vivipara) Infested with Immature Ixodes ricinus Ticks Preferentially Maintain the Circulation of Borrelia lusitaniae and B. burgdorferi Sensu Stricto in Anthropogenic Areas of Western Poland
Magdalena Wieczorek
,Renata Grochowalska
,Bartłomiej Najbar
,Bozena Sikora
,Jerzy Michalik
Posted: 14 October 2025
Kai Pascal Alexander Hänggeli
,Joachim Müller
,Manfred Heller
,Anne-Christine Uldry
,Sophie Braga-Lagache
,David Arranz-Solis
,Luis Miguel Ortega-Mora
,Andrew Hemphill
Toxoplasma gondii, the causative agent of toxoplasmosis widespread in animals and humans, is an intracellular apicomplexan protozoan parasite infecting a variety of host cells. Gene editing using CRISPR-Cas9 has become a standard tool to investigate the molecular genetics of this interaction. With respect to gene knock-out (KO) studies, the general paradigm implies that the gene of interest is expressed in the wildtype and that only the gene of interest is affected by the knock-out. Consequently, the observed phenotype depends on presence or absence of genes of interest. To challenge this paradigm, we knocked out two open reading frames (ORFs) constitutively expressed in T. gondii ShSp1 tachyzoites, but not essential, namely ORF 297720 encoding a trehalose-6-phosphatase homolog and ORF 319730 encoding a You2 C2C2 zinc finger homolog. We analyzed the proteomes of tachyzoites isolated at a late stage of infection, of intracellular tachyzoites and of host cells at an early stage of infection. The intended KO proteins were present in the T. gondii Sp1 wildtype but absent in the KO clones. Moreover, besides differentially expressed (DE) proteins specific to each KO, 17 DE proteins common to both KOs were identified in isolated and 39 in intracellular tachyzoites. Moreover, 76 common DE proteins were identified in host cells. Network and enrichment analyses showed that these proteins were functionally related to antiviral defense mechanisms. These results indicate that the KO of a gene of interest may not only affect the expression of other genes of the target organism, in our case T. gondii, but also the gene expression of its host cells. Therefore, phenotypes of KO strains may not be causally related to the KO of a given gene.
Toxoplasma gondii, the causative agent of toxoplasmosis widespread in animals and humans, is an intracellular apicomplexan protozoan parasite infecting a variety of host cells. Gene editing using CRISPR-Cas9 has become a standard tool to investigate the molecular genetics of this interaction. With respect to gene knock-out (KO) studies, the general paradigm implies that the gene of interest is expressed in the wildtype and that only the gene of interest is affected by the knock-out. Consequently, the observed phenotype depends on presence or absence of genes of interest. To challenge this paradigm, we knocked out two open reading frames (ORFs) constitutively expressed in T. gondii ShSp1 tachyzoites, but not essential, namely ORF 297720 encoding a trehalose-6-phosphatase homolog and ORF 319730 encoding a You2 C2C2 zinc finger homolog. We analyzed the proteomes of tachyzoites isolated at a late stage of infection, of intracellular tachyzoites and of host cells at an early stage of infection. The intended KO proteins were present in the T. gondii Sp1 wildtype but absent in the KO clones. Moreover, besides differentially expressed (DE) proteins specific to each KO, 17 DE proteins common to both KOs were identified in isolated and 39 in intracellular tachyzoites. Moreover, 76 common DE proteins were identified in host cells. Network and enrichment analyses showed that these proteins were functionally related to antiviral defense mechanisms. These results indicate that the KO of a gene of interest may not only affect the expression of other genes of the target organism, in our case T. gondii, but also the gene expression of its host cells. Therefore, phenotypes of KO strains may not be causally related to the KO of a given gene.
Posted: 06 October 2025
Lessons Learnt from a Five-Year Experience of the Groupe de Recherche Action en Santé (GRAS) Clinical Laboratory, Burkina Faso, in Participating to an External Proficiency Testing (EPT) Programme
A Diarra
,I Nebie
,NB Henry
,A Ouedraogo
,AT Konate
,AB Tiono
,SB Sirima
Background: Clinical research lab is a key component of the conduct of clinical studies. Enrolment, follow up of patients is mainly based on the diagnosis skills of lab technicians and automates performance. To overcome this challenge, since 2020, as part of the quality assurance of its lab research activities, GRAS has registered with the College of American Pathologists (CAP) and the Clinical Laboratories Services (CLS) Johannesburg, South Africa for external proficiency testing (EPT) of its laboratory. The performances achieved during these last five years are reported. Methods: PT samples were couriered out three times a year (quadr-month) (hereafter referred to as Q) to GRAS Lab and results were generally due back two to three weeks later. For parasitology, challenges specimen are thick and thin blood films stained with Giemsa and mounted with strip to protected them for multiple use, or photographs also called ̎ whole slide images ̎ (WSI). For biochemistry and haematology, a set of 5 samples were received for processing. All the evaluations were performed according to the GRAS lab internal established procedures. Results: The overall CAP parasitological laboratory performance in term of diagnosis accuracy of malaria parasites and other blood parasites from 2020 to 2024 was 97.3% (ranging from 93,33 to 100%); with 93,33%, 100%, 100%, 93.33% and 100% achieved respectively in 2020, 2021, 2022, 2023 and 2024. Annually, the number of evaluated microscopists varied according to operational staff at the time of evaluation. In total, 31 microscopists were enrolled in CLS PT scheme, with 73.9% graded as “experts” microscopists and 19.2% graded as “reference” microscopists. For haematology, the PT showed 100% accuracy over the 4 years participation indicating the high-performance level of the tested automates and the comparability of data between automates. Same trend was observed for biochemistry PT results with an overall score of 92,12% ranging from 78% to 100%. Conclusion: The Proficiency testing has demonstrated value as an important laboratory quality assurance tool to guaranty the accuracy skill for malaria parasites and other blood parasites diagnosis by lab technicians and results generated by the automates. It has helped laboratories identify issues related to test design and performance.
Background: Clinical research lab is a key component of the conduct of clinical studies. Enrolment, follow up of patients is mainly based on the diagnosis skills of lab technicians and automates performance. To overcome this challenge, since 2020, as part of the quality assurance of its lab research activities, GRAS has registered with the College of American Pathologists (CAP) and the Clinical Laboratories Services (CLS) Johannesburg, South Africa for external proficiency testing (EPT) of its laboratory. The performances achieved during these last five years are reported. Methods: PT samples were couriered out three times a year (quadr-month) (hereafter referred to as Q) to GRAS Lab and results were generally due back two to three weeks later. For parasitology, challenges specimen are thick and thin blood films stained with Giemsa and mounted with strip to protected them for multiple use, or photographs also called ̎ whole slide images ̎ (WSI). For biochemistry and haematology, a set of 5 samples were received for processing. All the evaluations were performed according to the GRAS lab internal established procedures. Results: The overall CAP parasitological laboratory performance in term of diagnosis accuracy of malaria parasites and other blood parasites from 2020 to 2024 was 97.3% (ranging from 93,33 to 100%); with 93,33%, 100%, 100%, 93.33% and 100% achieved respectively in 2020, 2021, 2022, 2023 and 2024. Annually, the number of evaluated microscopists varied according to operational staff at the time of evaluation. In total, 31 microscopists were enrolled in CLS PT scheme, with 73.9% graded as “experts” microscopists and 19.2% graded as “reference” microscopists. For haematology, the PT showed 100% accuracy over the 4 years participation indicating the high-performance level of the tested automates and the comparability of data between automates. Same trend was observed for biochemistry PT results with an overall score of 92,12% ranging from 78% to 100%. Conclusion: The Proficiency testing has demonstrated value as an important laboratory quality assurance tool to guaranty the accuracy skill for malaria parasites and other blood parasites diagnosis by lab technicians and results generated by the automates. It has helped laboratories identify issues related to test design and performance.
Posted: 18 September 2025
Homology Modeling of Type‐P5 ATPases from the Malaria Parasite: Insight into Their Functions and Evolution, and Implications About the Effect and Role of Intrinsically Disordered Protein Structure
Mark F. Wiser
Posted: 18 September 2025
Detection of Leishmania DNA in Ticks and Fleas from Dogs and Domestic Animals in Endemic Algerian Provinces
Razika Benikhlef
,Naouel Eddaikra
,Assia Beneldjouzi
,Maria Dekar
,Lydia Hamrioui
,Karima Brahmi
,Souad Bencherifa
,Denis Sereno
Background: Leishmaniasis is a zoonotic vector-borne disease and a significant global public health concern worldwide and in Algeria. In This study we have investigated the potential role of ticks and fleas as carriers of Leishmania in endemic regions of Algeria. Methods: Adult ectoparasites were collected from reservoir dogs and cohabiting animals across three provinces: Tizi-Ouzou (northeast), M'Sila (southeast), and Tébessa (extreme east). A subset of 247 ectoparasites was randomly selected for Leishmania DNA screening using ITS1-PCR. Results: Morphological identification revealed two tick species, Rhipicephalus turanicus (378 specimens) and Rhipicephalus sanguineus s.l (127 specimens), and one flea species, Ctenocephalides felis (94 specimens). Dogs were the most heavily infested hosts (74.12%), followed by sheep (9.51%) and cats (9.34%). Leishmania DNA was detected in 36.43% (90/247) of the tested specimens, with higher positivity in ticks (41.32%) compared to fleas (17.64%). Infection rates varied by host species, with dogs harboring the majority of positive ectoparasites (62/90), primarily R. sanguineus s.l (19/30) and R. turanicus (40/115). Leishmania DNA was also detected in ectoparasites collected from cats and sheep, whereas goats and rabbits were free from Leishmania DNA. Conclusions: This investigation highlights the high detection rate of Leishmania DNA in ticks and fleas from animals in Algerian endemic regions, indicating exposure to infected hosts. Together with previous reports, these findings support the view that ticks and fleas may act as incidental hosts or mechanical carriers of the parasite. However, their role in parasite transmission remains unconfirmed and warrant further investigation, particularly through studies assessing vector competence. These results emphasize the need for additional research to clarify the contribution of these ectoparasites to Leishmania transmission and multi-host dynamics.
Background: Leishmaniasis is a zoonotic vector-borne disease and a significant global public health concern worldwide and in Algeria. In This study we have investigated the potential role of ticks and fleas as carriers of Leishmania in endemic regions of Algeria. Methods: Adult ectoparasites were collected from reservoir dogs and cohabiting animals across three provinces: Tizi-Ouzou (northeast), M'Sila (southeast), and Tébessa (extreme east). A subset of 247 ectoparasites was randomly selected for Leishmania DNA screening using ITS1-PCR. Results: Morphological identification revealed two tick species, Rhipicephalus turanicus (378 specimens) and Rhipicephalus sanguineus s.l (127 specimens), and one flea species, Ctenocephalides felis (94 specimens). Dogs were the most heavily infested hosts (74.12%), followed by sheep (9.51%) and cats (9.34%). Leishmania DNA was detected in 36.43% (90/247) of the tested specimens, with higher positivity in ticks (41.32%) compared to fleas (17.64%). Infection rates varied by host species, with dogs harboring the majority of positive ectoparasites (62/90), primarily R. sanguineus s.l (19/30) and R. turanicus (40/115). Leishmania DNA was also detected in ectoparasites collected from cats and sheep, whereas goats and rabbits were free from Leishmania DNA. Conclusions: This investigation highlights the high detection rate of Leishmania DNA in ticks and fleas from animals in Algerian endemic regions, indicating exposure to infected hosts. Together with previous reports, these findings support the view that ticks and fleas may act as incidental hosts or mechanical carriers of the parasite. However, their role in parasite transmission remains unconfirmed and warrant further investigation, particularly through studies assessing vector competence. These results emphasize the need for additional research to clarify the contribution of these ectoparasites to Leishmania transmission and multi-host dynamics.
Posted: 16 September 2025
Geographic Distance as a Driver of Tabanidae Community Structure in the Coastal Plain of Southern Brazil
Rodrigo Ferreira Krüger
,Helena Iris Leite de Lima Silva
,Rafaela Freitas Rodrigues Mengue Dimer
,Marta Farias Aita
,Pablo Parodi
,Steve Mihok
,Tiago Kütter Krolow
Posted: 13 September 2025
First Molecular Characteristics and Morphology Updates of Priapocephalus eschrichtii (Cestoda: Tetrabothriidae) from a Gray Whale (Eschrichtius robustus)
Olga Loginova
,Ivan Belokobylskiy
,Sergei Spiridonov
Parasites of marine mammals are of significant interest in the fields of evolutionary biology, veterinary medicine, human health, conservation, and ecology. Therefore, every opportunity to study them should be seized. This study aimed to report on specimens of cestodes found in the small intestine of a gray whale (Eschrichtius robustus) in Chukotka, Russia, in 2024. The specimens were examined using light and scanning electron microscopy, histology, and molecular analysis. Based on their morphology and host specificity, the cestodes were identified as Priapocephalus eschrichtii. Analyses of the 18S and 28S ribosomal RNA genes confirmed a close relationship between P. eschrichtii and species of Tetrabothrius, which infect seabirds and whales. Sequences of the 18S, 28S, ITS2 rDNA, and gene CoxI mtDNA are reported here for the first time. More than 50 specimens of P. eschrichtii were detected in 1 meter of intestine of the whale with a maximum length of 50 cm. Chronic lymphoplasmacytic inflammation of the intestinal mucosa was observed in the infected whale. The eggs of the cestodes were clustered within an irregular membrane, which may contribute to multiple infestations of the host and lead to diseases that affect the whale’s health and survival. This study should be continued.
Parasites of marine mammals are of significant interest in the fields of evolutionary biology, veterinary medicine, human health, conservation, and ecology. Therefore, every opportunity to study them should be seized. This study aimed to report on specimens of cestodes found in the small intestine of a gray whale (Eschrichtius robustus) in Chukotka, Russia, in 2024. The specimens were examined using light and scanning electron microscopy, histology, and molecular analysis. Based on their morphology and host specificity, the cestodes were identified as Priapocephalus eschrichtii. Analyses of the 18S and 28S ribosomal RNA genes confirmed a close relationship between P. eschrichtii and species of Tetrabothrius, which infect seabirds and whales. Sequences of the 18S, 28S, ITS2 rDNA, and gene CoxI mtDNA are reported here for the first time. More than 50 specimens of P. eschrichtii were detected in 1 meter of intestine of the whale with a maximum length of 50 cm. Chronic lymphoplasmacytic inflammation of the intestinal mucosa was observed in the infected whale. The eggs of the cestodes were clustered within an irregular membrane, which may contribute to multiple infestations of the host and lead to diseases that affect the whale’s health and survival. This study should be continued.
Posted: 20 August 2025
Silent Circulation of Plasmodium vivax: First Asymptomatic Malaria Case Following Malaria-Free Certification in Argentina
María J. Dantur-Juri
,Betty J. Pazmiño-Gómez
,Fabricio Guevara-Viejó
,Roberto D. Coello-Peralta
,Paul L. Duque
,Natalia González-Piñeres
,Virginie Rougeron
,Fanny Degrugillier
,Stefania Dentice-Maidana
,Jonathan Liria-Salazar
+1 authors
Posted: 20 August 2025
Influence of Incubation Time for Correctness of Viability Assessment of Ascaris suum Eggs – Attempts to Optimise the Parasitological Examination
Radosław Badziak
,Jolanta Zdybel
,Zbigniew Osiński
,Ewa Bilska-Zając
,Jacek Karamon
,Jacek Sroka
,Marta Skubida
,Angelina Wójcik-Fatla
,Tomasz Cencek
Posted: 13 August 2025
Crithidia fasciculata Exhibits a Monoxenic Behaviour In Vitro and In Vivo
Julia Fernandes Barbosa dos Santos
,Carolina Boucinha Martins
,Valter Viana Andrade-Neto
,Thais Lemos-Silva
,Rosiane Freire Dos Santos
,Silvia Amaral Gonçalves Da-Silva
,Yara Maria Traub-Csekö
,Rubem Figueiredo Sadok Menna-Barreto
,Eduardo Caio Torres-Santos
,Claudia Masini D'Avila
+1 authors
Posted: 04 August 2025
C14DM Ablation Leads to Reduced Tolerance to Plasma Membrane Stress and Increased Drug Sensitivity in Leishmania major
Samrat Moitra
,Sumit Mukherjee
,Veronica L Hernandez
,Kai Zhang
Posted: 04 August 2025
Towards Setting Minimum and Optimal Data to Report for Malaria Molecular Surveillance with Targeted Sequencing: The “What” and the “Why”
Jonathan Juliano
,Cecile Meier-Scherling
,Neeva Wernsman Young
,George Tollefson
,Sean Connelly
,Jonathan Parr
,Melissa Conrad
,Jacob Sadler
,Christopher Hennelly
,Ashenafi Assefa
+12 authors
The COVID-19 pandemic showcased the power of genomic surveillance in tracking infectious diseases, driving rapid public health responses, and global collaboration. This same infrastructure is being leveraged for malaria molecular surveillance (MMS) in Africa to tackle challenges like artemisinin partial resistance and Plasmodium falciparum histidine-rich protein 2 and 3 gene deletions. However, variability in reporting sequencing methods and data reporting is currently limiting the validation, comparability, and reuse of data. To maximize the impact of MMS, we propose minimal and optimal data for reporting that are key for validation and maximize transparency and FAIR (Findable, Accessible, Interoperable, Reusable) principles. Rather than focusing on specific data formats, here, we propose what should be reported and why. Moving to reporting individual infection-level polymorphism or microhaplotype data is central to maximizing the impact of MMS. Reporting must adhere to local regulatory practices and ensure proper data oversight and management, preventing data colonialism and preserving opportunities for data generators. With malaria’s challenges transcending borders, reporting and adopting standardized practices are essential to advance research and strengthen global public health efforts.
The COVID-19 pandemic showcased the power of genomic surveillance in tracking infectious diseases, driving rapid public health responses, and global collaboration. This same infrastructure is being leveraged for malaria molecular surveillance (MMS) in Africa to tackle challenges like artemisinin partial resistance and Plasmodium falciparum histidine-rich protein 2 and 3 gene deletions. However, variability in reporting sequencing methods and data reporting is currently limiting the validation, comparability, and reuse of data. To maximize the impact of MMS, we propose minimal and optimal data for reporting that are key for validation and maximize transparency and FAIR (Findable, Accessible, Interoperable, Reusable) principles. Rather than focusing on specific data formats, here, we propose what should be reported and why. Moving to reporting individual infection-level polymorphism or microhaplotype data is central to maximizing the impact of MMS. Reporting must adhere to local regulatory practices and ensure proper data oversight and management, preventing data colonialism and preserving opportunities for data generators. With malaria’s challenges transcending borders, reporting and adopting standardized practices are essential to advance research and strengthen global public health efforts.
Posted: 21 July 2025
Progression of Trypanosoma cruzi Dm28c Strain Infection in a BALB/c Mouse Experimental Model
Maria Azul de Hernandez
,Silvina Villar
,Pamela Cribb
Posted: 17 July 2025
Deciphering the Fasciola hepatica Glycocode and Its Involvement in Host-Parasite Interactions
Jaclyn Swan
,Timothy C. Cameron
,Terry W. Spithill
,Travis Beddoe
Posted: 17 July 2025
Monthly and Daily Dynamics of Stomoxys calcitrans (Diptera: Muscidae) in Livestock Farms of the Batna Region (Northeastern Algeria)
Chaimaa Azzouzi
,Mehdi Boucheikhchoukh
,Noureddine Mechouk
,Scherazed Sedraoui
,Zenia Safia
Posted: 15 July 2025
Epidemiological Situation of Bovine Haemoparasites in the Peri-Urban Area of Bouaké in Côte d'Ivoire
Laciné Kalo Bamba
,Nawolo Yeo
,Gouagoua Severin Kouadja
,Adam Camille Kouamé
,Kouakou Eugene Kouadio
,Kouabena Kreman
Posted: 11 July 2025
Consensus Document for the Study of Leishmaniasis from a One Health Approach in Spain
Joaquina Martín-Sánchez
,Jose M. Requena
,Montserrat Gállego
,Maribel Jiménez
,Ricardo Molina
,Paul Nguewa
,Francisco Morillas-Márquez
,José M. Pérez-Victoria
,Begoña Monge-Maillo
,Manuel Morales-Yuste
+1 authors
Posted: 11 July 2025
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