Nanosecond pulsed electric field (nsPEF) and vaccines: a novel technique for the inactivation of SARS-CoV-2 and other viruses?

Since the beginning of 2020, worldwide attention has been being focussed on SARS-CoV-2, the second strain of the severe acute respiratory syndrome virus. Although advances in vaccine technology have been made, particularly considering the advent of mRNA vaccines, up to date, no single antigen design can ensure optimal immune response. Therefore, new technologies must be tested as to their ability to further improve vaccines. Nanosecond Pulsed Electric Field (nsPEF) is one such method showing great promise in different biomedical and industrial fields, including the fight against COVID-19. Of note, available research shows that nsPEF directly damages the cell's DNA, so it is critical to determine if this technology could be able to fragment either viral DNA or RNA so as to be used as a novel technology to produce inactivated pathogenic agents that may, in turn, be used for the production of vaccines. Considering the available evidence, we propose that nsPEF may be used to produce inactivated SARS-CoV-2 viruses that may in turn be used to produce novel vaccines, as another tool to address 20 the current COVID-19 pandemic.Key MessagesViral inactivation by using pulsed electric fields in the nanosecond frequency.DNA fragmentation by a Nanosecond Pulsed Electric Field (nsPEF).Opportunity to apply new technologies in vaccine development.

[Psychological evaluations of operation of patients with mental disorders].

UNLABELLED: The severe and chronic mental illnesses such as schizophrenia are associated with very complex problems that are not confined to the symptoms but also affect psychosocial functioning and community integration. OBJECTIVE: To evaluate the reliability (in terms of internal consistency) of the WHODAS 2.0 for analyzing the psychosocial functioning of people with schizophrenia living in the community and using mental health services, and report the WHODAS 2.0 results from the same sample. METHODS: The sample comprised 100 users diagnosed with schizophrenia (F20 to F29 of ICD 10) living in the community and in contact with mental health services in Córdoba, Buenos Aires and San Luis in Argentina. Interviewers were trained in the use of the WHODAS 2.0. RESULTS: For the overall internal consistency of the WHODAS 2.0: Cronbach's alpha = 0.78. WHODAS 2.0 results for these service users were: Domain 1, 57% none, 19.4% mild, 20.4% moderate, 3.2% severe. Domain 2, 60.2% none, 18.3% mild, 17.2% moderate, 3.2% severe. Domain 3, 54.9% none, 23.7% mild, 19.4% moderate, 2.2% severe. Domain 4, 74.2% none, 18.3% mild, 6.5% moderate, 1.1% severe. Domain 5, 82.8% none, 1.8% mild, 4.3% moderate, 1.1% severe. Domain 6, 81.7% none, 15.1% mild, 3.2% moderate. CONCLUSIONS: WHODAS 2.0 showed high internal consistency in this population. Most of the service users had no disability or mild disability in all 6 domains. A substantial minority had moderate disability in some domains (D1, D3). In all domains, <5% had severe disability.

Profesionales de la Salud y Formación Docente: Una propuesta de Curriculum integrado / Profissionais de saúde e formação de professores: uma proposta de currícula integrada / Health Professionals And Teacher Training: Integrated Syllabus Proposal

La presente investigación tiene el propósito de describir el proceso de formación en investigación-acción efectuada en la integración realizada por dos cátedras de la Carrera del Profesorado Universitario: Investigación educativa y Didáctica Especial producto de siete años de trabajo.Dicho proceso se sostiene a partir del reconocimiento de problemáticas planteadas por los alumnos-profesionales,en su trabajo como docentes. La construcción del problema de investigación requiere de diferentes estrategias pedagógicas. La metodología se basó en el enfoque de investigación-acción. Los resultados confirman que la integración inter cátedras un elemento clave para transformar el quehacer universitario y es una alternativa para fomentar y desarrollar la investigación científica que contribuya al mejoramiento y transformación de la sociedad, como uno de los objetivos de la Universidad Católica de Córdoba a la par que se constituye en una estrategia para el acuerdo, los consensos, la innovación e investigación que están en consonancia con la misión institucional...

The purpose of this research is to describe the training process in research-action that tookplace in the integration of Educational Research and Special Didactics; two chairs of thecourse of studies University Teaching, result of seven-year-work. Said process arises from theacknowledgment of issues proposed by students-professionals in their work as teachers. Theconstruction of the research problem requires different pedagogic strategies. Methodologywas based on the research-action approach. Results confi rm that inter-chair integrationis a key factor to transform university tasks and an alternative to encourage and developscientifi c research helping to improve and transform society as one of the objectives on theCatholic University of Cordoba. At the same time, it is becoming a strategy for agreement,consensus, innovation and investigation, consistent with the institutional mission...

Consumption of psychoactive substances in educational institutions: an inquiry into the state of affairs in the schools of Córdoba.

This study describes and analyses the consumption of psychoactive substances in educational institutions, the school environment conditions and its relation to the school standing of the students. In the first stage, a quantitative evaluation was performed, based on the records of the Second National Survey of Secondary School Students carried out in Córdoba in 2005; the second stage used a qualitative approach. A multistage probabilistic sample of 4593 students was used for the quantitative assessment. The analysis comprised summary measurements, multivariate and factorial correspondence analysis, in all cases with a significance level of p < 0.05. For the qualitative stage, an ethnographic approach was applied. The state schools were chosen using an intentional, cumulative and sequential sampling method. Ten in-depth interviews were carried out to gather qualitative data that was analyzed using the comparative constant method. Results evince that consumption is lower among morning-shift students and that grade repetition and behavior problems are associated to consumption of illegal drugs. Furthermore, it was detected that students in night-shift schools with low academic and disciplinary demand standards have a higher probability of consumption. It is clear that as academic standards decrease, consumption increases.

Mortalidad por trastornos mentales y por causas externas: análisis de una Década en Argentina / Mortality due to mental disorders and external causes: analysis of a decade in Argentina

Objetivo: analizar las tasas de mortalidad de Trastornos Mentales y del Comportamiento (TMyC) y de las Causas Externas (CE) en las Estadísticas Vitales de Argentina, periodo 2000-2009.Metodología: se utilizó las bases de datos de defunciones, Argentina, años 2000 a 2009, de la Dirección de Estadísticas e Información en Salud Ministerial. Se construyeron tasas generales y específicas. Las estimaciones poblacionales, se obtuvieron a partir del aplicativo AGEINT. Según la distribución de la variable, se utilizó análisis de la varianza o test no paramétricos. Resultados: se observa un comportamiento disímil de la tasa de mortalidad por TMyC según sexo, pero con un comportamiento similar por cada año. Los TMyC y las CE, comprometen a la población adulta del país, con tasas mayores en el grupo de varones.Conclusión: tener en cuenta el impacto de los TMyC y CE, permite diseñar políticas públicas en salud adecuadas a las realidades de cada contexto

Objective: To analyze mortality rates due to mental and behavioral disorders (MBD) and external causes (EC) using Vital Statistics of Argentina, 2000-2009.Methods: Mortality data 2000-2009 were obtained from the Bureau of Statistics and Information, Ministry of Health, Argentina. General and specific rates were set up. Population estimates were obtained from the AGEINT application. According to the distribution of the variable, analysis of variance or nonparametric tests were used.Results: Dissimilar MBD mortality rates according to sex were observed, but with a similar pattern each year. The MBD and EC affect the adult population of the country, with higher rates in the male group.Conclusion: Taking into account the impact of MBD and EC, allows the design of public policies suitable to the realities of each health context

Consumption of psychoactive substances in educational institutions: an inquiry into the state of affairs in the schools of Córdoba / Consumption of psychoactive substances in educational institutions: an inquiry into the state of affairs in the schools of Córdoba.

This study describes and analyses the consumption of psychoactive substances in educational institutions, the school environment conditions and its relation to the school standing of the students. In the first stage, a quantitative evaluation was performed, based on the records of the Second National Survey of Secondary School Students carried out in Córdoba in 2005; the second stage used a qualitative approach. A multistage probabilistic sample of 4593 students was used for the quantitative assessment. The analysis comprised summary measurements, multivariate and factorial correspondence analysis, in all cases with a significance level of p < 0.05. For the qualitative stage, an ethnographic approach was applied. The state schools were chosen using an intentional, cumulative and sequential sampling method. Ten in-depth interviews were carried out to gather qualitative data that was analyzed using the comparative constant method. Results evince that consumption is lower among morning-shift students and that grade repetition and behavior problems are associated to consumption of illegal drugs. Furthermore, it was detected that students in night-shift schools with low academic and disciplinary demand standards have a higher probability of consumption. It is clear that as academic standards decrease, consumption increases.

Consumption of psychoactive substances in educational institutions: an inquiry into the state of affairs in the schools of Córdoba. / Consumption of psychoactive substances in educational institutions: an inquiry into the state of affairs in the schools of Córdoba.

This study describes and analyses the consumption of psychoactive substances in educational institutions, the school environment conditions and its relation to the school standing of the students. In the first stage, a quantitative evaluation was performed, based on the records of the Second National Survey of Secondary School Students carried out in Córdoba in 2005; the second stage used a qualitative approach. A multistage probabilistic sample of 4593 students was used for the quantitative assessment. The analysis comprised summary measurements, multivariate and factorial correspondence analysis, in all cases with a significance level of p < 0.05. For the qualitative stage, an ethnographic approach was applied. The state schools were chosen using an intentional, cumulative and sequential sampling method. Ten in-depth interviews were carried out to gather qualitative data that was analyzed using the comparative constant method. Results evince that consumption is lower among morning-shift students and that grade repetition and behavior problems are associated to consumption of illegal drugs. Furthermore, it was detected that students in night-shift schools with low academic and disciplinary demand standards have a higher probability of consumption. It is clear that as academic standards decrease, consumption increases.

Mortalidad por trastornos mentales y por causas externas: análisis de una Década en Argentina / Mortality due to mental disorders and external causes: analysis of a decade in Argentina

Objetivo: analizar las tasas de mortalidad de Trastornos Mentales y del Comportamiento (TMyC) y de las Causas Externas (CE) en las Estadísticas Vitales de Argentina, periodo 2000-2009.Metodología: se utilizó las bases de datos de defunciones, Argentina, años 2000 a 2009, de la Dirección de Estadísticas e Información en Salud Ministerial. Se construyeron tasas generales y específicas. Las estimaciones poblacionales, se obtuvieron a partir del aplicativo AGEINT. Según la distribución de la variable, se utilizó análisis de la varianza o test no paramétricos. Resultados: se observa un comportamiento disímil de la tasa de mortalidad por TMyC según sexo, pero con un comportamiento similar por cada año. Los TMyC y las CE, comprometen a la población adulta del país, con tasas mayores en el grupo de varones.Conclusión: tener en cuenta el impacto de los TMyC y CE, permite diseñar políticas públicas en salud adecuadas a las realidades de cada contexto(AU)

Objective: To analyze mortality rates due to mental and behavioral disorders (MBD) and external causes (EC) using Vital Statistics of Argentina, 2000-2009.Methods: Mortality data 2000-2009 were obtained from the Bureau of Statistics and Information, Ministry of Health, Argentina. General and specific rates were set up. Population estimates were obtained from the AGEINT application. According to the distribution of the variable, analysis of variance or nonparametric tests were used.Results: Dissimilar MBD mortality rates according to sex were observed, but with a similar pattern each year. The MBD and EC affect the adult population of the country, with higher rates in the male group.Conclusion: Taking into account the impact of MBD and EC, allows the design of public policies suitable to the realities of each health context(AU)

Sistema de vigilancia en Chagas facilitado por tecnologías de información y comunicación / Surveillance system in Chagas facilitated by information and communication technologies

La aplicación de las tecnologías de información ycomunicación para los sistemas de vigilancia especializadosen enfermedades prioritarias en América Latina como laenfermedad de Chagas, constituye un nuevo y valiosoaporte para el control de la enfermedad que representa ungrave problema de salud pública. El objetivo del presentetrabajo fue evaluar un sistema de vigilancia epidemiológica yatención médica con el apoyo de tecnologías de informacióny comunicación (TICs), con la finalidad de detectar eintroducir precozmente al sistema de salud a los individuosseropositivos para Chagas en un área endémica del interiorde Argentina.

[Postoperative hyponatremia in pediatric patients]. / Hiponatremia postoperatoria en pacientes pediátricos.

Fluid replacement therapy for pediatric patients in the past 50 years has meant the infusion of hypotonic solutions in amounts calculated using the Holliday-Segar formula. Recent studies have focused attention on the incidence of postoperative hyponatremia and associated morbidity and mortality rates, generating debate on the advisability of perioperative fluid therapy and calling into question both the effectiveness of this strategy and the quantities used. We report 3 cases of hyponatremic encephalopathy in children following different types of minor surgery. Free water excretion by the kidneys is known to be a conditioning factor in this therapy, yet the ideal way to provide pediatric fluid therapy is still hotly debated. The question cannot be resolved until large randomized clinical trials are carried out to compare the use of hypotonic and isotonic solutions. Some general recommendations can be offered, however, in the interest of lowering the incidence of electrolyte disturbances and diminishing their repercussions.

Hiponatremia postoperatoria en pacientes pediátricos / Postoperative hyponatremia in pediatric patients

Durante los últimos 50 años la fluidoterapia de mantenimientopara pacientes pediátricos se ha realizadocon soluciones hipotónicas y se ha cuantificado mediantela fórmula de Holliday y Segar. Recientes publicacioneshan puesto de manifiesto tanto la incidencia como lamorbi-mortalidad asociadas a la hiponatremia postoperatoria,generando opiniones encontradas sobre la idoneidadde la fluidoterapia perioperatoria, tanto respectoa su cantidad como a su calidad.Describimos tres casos de encefalopatía hiponatrémicaen niños, tras intervenciones menores realizadas pordiferentes servicios quirúrgicos en nuestro centro.La disminución en la capacidad de excreción renal deagua libre perioperatoria condiciona de forma marcadala fluidoterapia a realizar durante este periodo; a pesardel reconocimiento de este hecho, existe gran controversiarespecto a la fluidoterapia pediátrica ideal que nopodrá resolverse hasta que no se realicen amplios ensayosclínicos, prospectivos y randomizados comparandola fluidoterapia de mantenimiento con soluciones hipotónicase isotónicas. Sin embargo, es posible realizar unasrecomendaciones generales para reducir la incidencia yconsecuencias de esta alteración electrolítica(AU)

Fluid replacement therapy for pediatric patients inthe past 50 years has meant the infusion of hypotonicsolutions in amounts calculated using the Holliday-Segarformula. Recent studies have focused attention on theincidence of postoperative hyponatremia and associatedmorbidity and mortality rates, generating debate on theadvisability of perioperative fluid therapy and callinginto question both the effectiveness of this strategy andthe quantities used. We report 3 cases of hyponatremicencephalopathy in children following different types ofminor surgery. Free water excretion by the kidneys isknown to be a conditioning factor in this therapy, yet theideal way to provide pediatric fluid therapy is still hotlydebated. The question cannot be resolved until largerandomized clinical trials are carried out to compare theuse of hypotonic and isotonic solutions. Some generalrecommendations can be offered, however, in theinterest of lowering the incidence of electrolytedisturbances and diminishing their repercussions(AU)

Trichinella: differential expression of angiogenic factors in macrophages stimulated with antigens from encapsulated and non-encapsulated species.

The newborn larval stage of Trichinella spiralis enters the host striated skeletal muscle cell resulting in the formation of the nurse cell. Vascular Endothelial Growth Factor (VEGF) was detected in cells in the area immediately surrounding the nurse cells. However, no data are available on the antigens involved, the role of other angiogenic factors or the relationship of angiogenesis with Nitric Oxide (NO) production. Using macrophage cell culture we study the effect of different Trichinella L1 antigens from one encapsulated (T. spiralis) and one non-encapsulated (Trichinellapseudospiralis) on the expression of VEGF and basic Fibroblast Growth Factor (FGF2). Also, we investigate the relationship between the production of NO and angiogenic mediators. The results show that encapsulated and non-encapsulated Trichinella species are different in their capacity to stimulate the expression of VEGF and FGF2 from host macrophages. Finally, there is no relationship between angiogenic factors and NO production by T. spiralis antigen.

Involvement of the beta-adrenergic system in the cardiac chronic form of experimental Trypanosoma cruzi infection.

Changes in the cardiac beta-adrenergic system in early stages of Trypanosoma cruzi infection have been described. Here, we studied an early (135 days post-infection-p.i.) and a late stage (365 days p.i.) of the cardiac chronic form of the experimental infection (Tulahuen or SGO-Z12 strains), determining plasma epinephrine and norepinephrine levels, beta-receptor density, affinity and function, cardiac cAMP concentration and phosphodiesterase activity, cardiac contractility, and the presence of beta-receptor autoantibodies. Tulahuen-infected mice presented lower epinephrine and norepinephrine levels; lower beta-receptor affinity and density; a diminished norepinephrine response and higher cAMP levels in the early stage, and a basal contractility similar to non-infected controls in the early and augmented in the late stage. The Tulahuen strain induced autoantibodies with weak beta-receptor interaction. SGO-Z12-infected mice presented lower norepinephrine levels and epinephrine levels that diminished with the evolution of the infection; lower beta-receptor affinity and an increased density; unchanged epinephrine and norepinephrine response in the early and a diminished response in the late stage; higher cAMP levels and unchanged basal contractility. The SGO-Z12 isolate induced beta-receptor autoantibodies with strong interaction with the beta-receptors. None of the antibodies, however, acted a as beta-receptor agonist. The present results demonstrate that this system is seriously compromised in the cardiac chronic stage of T. cruzi infection.

Trichinellosis survey in the wild boar from the Toledo mountains in south-western Spain (2007-2008): molecular characterization of Trichinella isolates by ISSR-PCR.

In Spain, trichinellosis represents a public health problem, with an average of five outbreaks per year, wild boar meat being the main source of infection. A trichinellosis survey (2007-2008 hunting campaign) was carried out on wild boars in the Toledo Mountains (south-western Spain, EU) in the context of a surveillance programme on wildlife diseases. A total of 2216 wild boars from different locations of the region were examined. The examination was carried out by veterinarians in the local abattoir (Matadero Municipal de Toledo). The positive samples were sent to the Department of Parasitology (Facultad de Farmacia, UCM) for experimental isolation and specific identification by inter-simple sequence repeat-polymerase chain reaction (ISSR-PCR). Using this technique we identified 17 isolates as Trichinella spiralis with an electrophoretic profile indistinguishable from the T. spiralis reference strain (ISS48). We confirmed that ISSR-PCR is a robust technique for the molecular identification of Trichinella isolates. According to our results, the prevalence of T. spiralis in wild boars from the Toledo Mountains (>800 m above sea level) during the hunting season was approximately 0.77%. The prevalence of T. spiralis (100% of our observations) is a good example of the persistence of this species in sylvatic conditions (coming from the domestic cycle), if a good wild host is abundant. Our observations confirm the major prevalence of T. spiralis over T. britovi in this region, as well as the risk to human health represented by the consumption of uninspected wild boar meat.

Identification of Spanish Trichinella isolates by ISSR-PCR: intra-specific variability of Trichinella britovi.

In the present work, we investigated genetic variability of the Spanish Trichinella isolates by ISSR-PCR (inter-simple sequence repeat polymerase chain reaction), a technique that is being successfully used to study diversity among related populations. We recovered a total of 43 isolates from different host and geographic localization and identified them by molecular techniques (RAPD and multiplex-PCR) and by Western blot with monoclonal antibodies US5 and US9. Nineteen (44.2%) out of 43 were identified as Trichinella spiralis and 24 (55.8%) as Trichinella britovi. When these samples were analysed by the ISSR technique, all the T. spiralis isolates presented a pattern similar to the T. spiralis ISS116. By contrast, the ISSR-PCR analysis of the isolates identified as T. britovi, showed two different banding profiles compatible with the European T. britovi isolate pattern (ISS2), and the autochthonous Spanish T. britovi isolate (ISS11). Three of these 43 isolates were involved in human outbreaks; the three were identified as T. britovi and showed a pattern similar to the European isolate ISS2. As conclusion, we highlight that an intra-species variability within the Spanish T. britovi isolates analysed was observed, with a predominant group similar to T. britovi ISS2, while T. spiralis group isolates were more homogeneous. No correlations were found between the different ISSR-PCR T. britovi types and the host/geographical origin of the isolates.

Prevalence of Trichinella spp. in North Spain wild fauna and new variety of Trichinella britovi identification.

Trichinella spiralis and Trichinella britovi live in apparent sympatry among wild fauna of the Iberian Peninsula. In the present study 105 Trichinella isolates from wild mammals were typed by inter-sequence simple repeat PCR (ISSR-PCR). All isolates identified as T. spiralis were indistinguishable from the ISS48 reference strain. Among those belonging to T. britovi, four variations were clearly distinguishable; two of them, ISS11 C-76 and ISS86 MON, had been previously detected while the ISS2 reference strain and Trichinella Rioja 3, (MVUL/SP/02/R3) had not been reported before. The newly distinguished genotype of T. britovi was analyzed by ISSR-PCR, multiplex-PCR, UARR sequencing, and single larva cross-breeding with the other T. britovi genotypes including Trichinella T8 (ISS49). Among all of them, the ISS11 and ISS2 isolates were found to be the most frequent. The uniformity found within T. spiralis isolates is consistent with its recent introduction in Iberian Peninsula, whereas the presence of four variations within T. britovi suggests that this species is an endemic species. Orographical diversity of the West-End of Eurasian Region could act to preserve population diversity observed within T. britovi.

The addition of a new immunomodulator with the adjuvant adaptation ADAD system using fatty acid binding proteins increases the protection against Fasciola hepatica.

Fatty acid binding proteins (FABP) have shown protective immune response against Fasciola hepatica infection. We evaluated the protection induced by the Fh12 FABP from F. hepatica (Fh12) combined with the new immunomodulator the lipidic aminoalcohol OA0012 in the ADAD system in mice and sheep. In this work we introduced a lipidic aminoalcohol OA0012 as immunomodulator alone or in combination with the hydroalcoholic extract of Phlebodium pseudoaureum; PAL. Mice vaccinated with ADAD containing OA0012+Fh12 or OA0012+Qs+Fh12 had survival rates of 40-50%. Sheep ADAD-vaccinated with OA0012+Qs+Fh12 showed lower fluke recovery, less hepatic lesions and higher post-infection daily weight gain than F. hepatica infected control animals. Sheep ADAD-vaccinated with OA0012 combined PAL and Qs+Fh12 showed lower fluke recovery (42%), lower adult worms count (57%) lower faecal egg count (38%), less hepatic lesions and higher post-infection daily weight gain than F. hepatica infected control animals. Thus, the addition of a new immunomodulator of synthesis to ADAD system with FABPs increased the protection against F. hepatica.

Pharmacological immunomodulation of surgical trauma.

Surgery and accidental trauma induce changes in the immune response, showing a predominant pattern of activation through the Th2 cell pathway to the detriment of Th1 cell pathway activation. Anapsos is a hydrosoluble extract obtained from Polypodium leucotomos. Anapsos has shown immunomodulating effects in vitro. On a rat experimental model (tibia and fibula fracture), cytokines (interleukin [IL]-2, IL-4, IL-6, IL-10, and IL-12) (enzyme-linked immunosorbent assay, ELISA) and cell percentages of CD4, CD8 CD25, CD122, and CD132 (monoclonal antibodies, MoAb) were determined in peripheral blood 7 days before surgery (PRE), 1 day after surgery (1PO), and 7 days after surgery (7PO). On postoperative day 1, rats undergoing fracture show an increase of CD8 percent expression and IL-6 and IL-10 levels, in contrast to rats undergoing fracture plus anapsos treatment. On postoperative day 7, rats undergoing fracture show an increase of IL-6 levels, whereas rats undergoing fracture plus anapsos do not. The IL-12 level decreases on postoperative day 7 in the group with fracture but not in the fracture plus anapsos group. Thus, we conclude that anapsos is able to modulate the immune response after trauma, inhibiting Th2 pathway activation with no effect on Th1 pathway activation. In trauma, Anapsos could prevent the shifting Th1/Th2 balance.

Genetic and immunological characterization of the 14-3-3xi molecule from Schistosoma bovis.

Currently available candidate vaccines against schistosomiasis elicit only partial protection. In addition, the type of immune response that could lead to the highest level of protection against schistosomes has not yet been described. Thus, efforts should be made in both the identification of novel proteins essential for the parasite cycle and in the modulation of immune responses against these novel candidates through the combined use of immunomodulatory molecules. Several parasites have 14-3-3 proteins, and these proteins are known to play a key role in parasite biology. In the present work, we report the isolation and characterization of a new 14-3-3 gene from Schistosoma bovis and offer new information regarding the genetic structure of the gene. In addition, we have produced the corresponding recombinant protein. Finally, we describe the immune responses elicited by this protein when combined with 4 different immunomodulators in immunized mice.

Progress in the development of Fasciola hepatica vaccine using recombinant fatty acid binding protein with the adjuvant adaptation system ADAD.

Fatty acid binding proteins (FABP) have been designed as a potential vaccine against fasciolosis. In this work, the immunoprophylaxis of the recombinant Fh15 FABP from F. hepatica (Fh15) in adjuvant/immunomodulator ADAD system was evaluated using mice and sheep challenged with F. hepatica. The ADAD system combines the Fh15 antigen with an immunomodulator (hydroalcoholic extract of Polypodium leucotomos; PAL) and/or an adjuvant (saponins of Quillaja saponaria; Qs) in a water/oil emulsion (30/70) with a non-mineral oil (Montanide). All the infected control mice died by 41-48 days post-infection. The mice vaccinated with ADAD only with PAL+Fh15 present a survival rate of 40-50% and those vaccinated with ADAD containing PAL+Qs+Fh15 had a survival rate of 50-62.5%. IgG1 antibodies were lower in surviving mice in comparison with non-surviving mice. The sheep vaccinated with ADAD PAL+Qs+Fh15 showed lower fluke recovery (43%), less hepatic lesions and higher post-infection daily weight gain than F. hepatica infected control animals. Thus, the ADAD system using recombinant fatty acid binding proteins from F. hepatica could be a good option to develop vaccines against F. hepatica.