The oral health situation and treatment need of schoolchildren Afghanistan: a cross-sectional study.

AIM: The present study explores the treatment need for dental caries in schoolchildren in Herat, Afghanistan. METHODS: A convenience sample of 13 schools were selected for the study. All schools were located in the urban areas near Herat and were selected through allocation by the Ministry of Health, which also approved the study protocol. In the schools, classes were allocated by the principal of the school. All the children in the allocated classes were included in the survey. Data collection was performed in the school setting by trained Afghan dentist examiners. To measure caries experience, DMFT/dmft scores were used, counting the number of decayed (measured at both white spot (D≥1) and cavitation level (D≥3), according to WHO criteria), missing and filled teeth. CONCLUSION: Dental caries is a considerable oral health problem in the study population. The present sample has a high proportion of untreated carious lesions and a very low level of restorative care. Moreover, significant differences were shown in relation to gender and age groups. The present survey results confirm the need for professional operative and preventive oral health care in this region.

Antimicrobial use in animals: a journey towards integrated surveillance.

In 2015, the World Organisation for Animal Health (WOAH, founded as OIE) initiated the annual collection of data on antimicrobials intended for use in animals using a Microsoft Excel questionnaire. In 2022, WOAH initiated the migration to a customised interactive online system: ANIMUSE Global Database. This system enables national Veterinary Services not only to monitor and report data more easily and more accurately, but also to visualise, analyse and use data for surveillance purposes to their own benefit in the implementation of national action plans on antimicrobial resistance. This journey started seven years ago, with progressive improvements in the way data are collected, analysed and reported and continuous adaptations to overcome various challenges encountered (e.g. data confidentiality, training of civil servants, calculation of active ingredients, standardisation to enable fair comparisons and trend analyses, and data interoperability). Technical developments have been key in the success of this endeavour. However, it is important not to underestimate the importance of the human element: to listen to WOAH Members and their needs, and to exchange to solve issues, adapt tools, and gain and maintain trust. The journey is not over yet, and more developments are foreseen, such as to complement current data sources with data collected directly at the farm level; strengthen interoperability and integrated analysis with cross-sectoral databases; and facilitate institutionalisation of data collection and systematic use in monitoring, evaluation, lesson learning, reporting and, eventually, surveillance of antimicrobial use and antimicrobial resistance when implementing and updating national action plans. This paper describes how all these challenges were overcome and how future challenges will be addressed.

En 2015, l'Organisation mondiale de la santé animale (OMSA, fondée en tant qu'OIE) a démarré, au moyen d'un questionnaire Microsoft Excel, une collecte annuelle de données sur les agents antimicrobiens destinés à être utilisés chez les animaux. L'OMSA a engagé, en 2022, la migration de cette collecte vers un système interactif en ligne sur mesure : la base de données mondiale ANIMUSE. Grâce à ce système, les Services vétérinaires pourront non seulement suivre et faire remonter les données plus facilement et avec davantage de précision, mais ils pourront aussi visualiser, analyser et utiliser ces données à leurs propres fins de surveillance, dans le cadre de la mise en oeuvre de plans d'action nationaux sur la résistance aux antimicrobiens. Ce travail a commencé il y a sept ans et des progrès constants ont été enregistrés en termes de collecte, d'analyse et de notification des données ; des adaptations continues ont également permis de dépasser les différents défis rencontrés (par exemple, en termes de confidentialité des données, de formation des fonctionnaires, de calcul des ingrédients actifs, de normalisation permettant d'établir des comparaisons équitables et des analyses de tendances et d'interopérabilité des données). Les avancées techniques ont joué un rôle clé dans la réussite de cette initiative. Il est cependant essentiel de ne pas sous-estimer l'importance du facteur humain : écoute des Membres de l'OMSA et de leurs besoins, échanges afin de résoudre les problèmes, adaptation des outils et obtention et préservation de la confiance. Cette aventure n'est pas terminée et des évolutions sont à venir : ajout des données collectées directement au niveau des élevages parmi les sources de données actuelles ; renforcement de l'interopérabilité et de l'analyse intégrée en recourant aux bases de données intersectorielles ; et institutionnalisation de la collecte de données et de son usage systématique dans le suivi, l'évaluation, les enseignements, les notifications et, à terme, la surveillance de l'utilisation des agents antimicrobiens et de l'antibiorésistance lors du déploiement et de la mise à jour des plans d'action nationaux. Cet article décrit comment tous ces défis ont été surmontés, ainsi que la manière dont les futurs défis seront relevés.

En 2015, la Organización Mundial de Sanidad Animal (OMSA, fundada como OIE) implantó un sistema de obtención anual de datos sobre los productos antimicrobianos destinados a los animales, empleando para ello un cuestionario en forma de hoja de cálculo Excel. En 2022, la OMSA inició la migración de este dispositivo a un sistema interactivo en línea especialmente adaptado al efecto: la base de datos mundial ANIMUSE. Este sistema permite a los Servicios Veterinarios nacionales no solo obtener y notificar datos con más facilidad y exactitud, sino también visualizar, analizar y aprovechar esta información con fines de vigilancia en la aplicación de planes nacionales de acción sobre la resistencia a antimicrobianos. Este viaje, que empezó hace siete años, ha supuesto una progresiva mejora de los métodos de obtención, análisis y notificación de los datos y continuas adaptaciones para superar las diversas dificultades que iban surgiendo (p.ej. en cuanto a confidencialidad de los datos, formación de funcionarios, cálculo de las cantidades de principio activo, normalización con fines de comparación y de análisis de tendencias, o compatibilidad de los datos). Aunque los avances técnicos han sido fundamentales para el éxito de la empresa, no cabe subestimar la importancia del factor humano, ese empeño de escuchar a los Miembros de la OMSA y tener en cuenta sus necesidades, favorecer el intercambio para resolver problemas, adaptar las herramientas y forjar y mantener relaciones de confianza. El viaje aún no ha terminado. Previsiblemente habrá nuevos avances que permitan, por ejemplo, complementar las actuales fuentes de información con datos obtenidos directamente en la explotación, mejorar la compatibilidad y los análisis integrados con bases de datos intersectoriales, o institucionalizar en mayor medida la obtención de datos y su uso sistemático con fines de seguimiento, evaluación, aprendizaje, notificación y a la postre vigilancia del uso de antimicrobianos y de eventuales resistencias a la hora de aplicar o actualizar planes nacionales de acción. Los autores explican cómo se fueron superando todas esas dificultades y cómo se abordarán los problemas que puedan ir surgiendo en el futuro.

Intersubband Polariton-Polariton Scattering in a Dispersive Microcavity.

The ultrafast scattering dynamics of intersubband polaritons in dispersive cavities embedding GaAs/AlGaAs quantum wells are studied directly within their band structure using a noncollinear pump-probe geometry with phase-stable midinfrared pulses. Selective excitation of the lower polariton at a frequency of ∼25 THz and at a finite in-plane momentum k_{‖} leads to the emergence of a narrowband maximum in the probe reflectivity at k_{‖}=0. A quantum mechanical model identifies the underlying microscopic process as stimulated coherent polariton-polariton scattering. These results mark an important milestone toward quantum control and bosonic lasing in custom-tailored polaritonic systems in the mid and far infrared.

Physical properties of [Formula: see text] polymer electrolytes: nuclear magnetic resonance investigation and comparison with [Formula: see text].

The physical properties of the ionic conductor [Formula: see text], obtained by dissolution of lithium trifluoromethanesulphonylimide in poly(propylene oxide), have been investigated for several values of n. The glass transition temperature [Formula: see text] has been established from both DSC and NMR techniques. The diffusion coefficients of [Formula: see text]-containing species have been determined by the pulsed magnetic field gradient technique. The behaviour of the proton relaxation time [Formula: see text] versus temperature and concentration has been correlated to the glass temperature. The behaviour of the proton transverse relaxation function, obtained by the spin-echo technique, has been interpreted using a simple model in which two regimes and consequently two transverse relaxation times coexist and are assigned to the `entangled' and `non-entangled' parts of the high-molecular-weight polymer chains investigated.

Secretory IgA antibodies to Cryptosporidium parvum in AIDS patients with chronic cryptosporidiosis.

Immune mechanisms that may control Cryptosporidium parvum infection remain unknown. The role of T cell-mediated immunity is suggested by the chronic disease observed in AIDS patients and in athymic or CD4+ T cell-depleted mice. The role of specific antibodies is also unclear. This study sought to determine serum and secretory antibodies to C. parvum in patients infected with human immunodeficiency virus type 1 (HIV-1) with or without chronic cryptosporidiosis. C. parvum-specific antibodies and specific secretory antibodies were determined by ELISA in saliva and sera from 50 HIV-1-infected patients, 27 healthy adults, and 21 healthy children. Despite lower CD4+ lymphocyte counts, patients with chronic cryptosporidiosis had increased levels of C. parvum-specific antibodies in saliva and serum and higher specific secretory antibody levels in saliva than did controls. Persistence of protracted diarrhea despite high levels of both serum and secretory antibodies suggests that specific secretory antibodies are not sufficient to control this protozoan parasite infection of intestinal mucosa.

Cryptosporidium parvum sporozoite staining by propidium iodide.

Modified Ziehl-Neelsen (ZN) acid-fast stain is the usual method for detection of Cryptosporidium oocysts in feces. Propidium iodide permitted us to stain free or intra-oocyst sporozoites. With the ZN method only 3-5% of the oocysts purified from three human and one experimentally infected lamb dichromate-preserved feces were stained by carbol fuchsin. These fuchsin-stained oocysts were free of intact sporozoites as identified by propidium iodide staining. Treatment with 10% formalin or 0.5% sodium hypochlorite increased the percentage of acid-fast stained oocysts and thus the sensitivity of acid-fast staining. Treatment with sodium hypochlorite induced intra-oocyst sporozoite alterations as demonstrated by flow cytometric analysis of the oocysts' DNA content. Propidium iodide staining of fixed oocysts is a simple and rapid method to visualize sporozoites and to assess oocyst preservation after different treatments.

Transient secretory IgA deficiency in mice after cyclophosphamide treatment.

Cyclophosphamide (Cy), an alkylating agent widely used in chemotherapy of leukemia and cancer, causes a well-documented toxicity on hematopoietic and lymphoid cells. Neutropenia is thought to be the main factor involved in infectious complications following antimitotic chemotherapy. Little is known on the effects of these therapies on the mucosal associated lymphoid system which is one of the main barriers against environmental pathogenic agents. The present study examined the effects of a single administration of Cy (200 mg/kg) on murine T and B cell populations of Peyer's patches (PPs), IgA secretion in the proximal part of the small intestine, and plasma cells of the lamina propria. Cy induced in mice a transient decrease in the T and B cell populations of the PPs with a drastic fall of B cell counts and a profound decrease of intestinal IgA secretion due to a reduction of lamina propria plasma cells. This transient secretory IgA deficiency may contribute to the infectious complications following antimitotic chemotherapy.

Proliferative response of human T lymphocytes to a vaccinal preparation of ribosomes from Streptococcus pyogenes.

The in vitro lymphocyte-activating properties of a ribosomal preparation of Streptococcus pyogenes were investigated. The preparation was mitogenic for human lymphocytes with a peak of 3H-thymidine incorporation occurring after 3-5 days of culture. The response was abolished by removal of CD3-positive cells and by alteration of accessory cells by exposure to L-leucine methyl ester. Most of the cells synthesizing DNA at the end of the culture expressed CD4 or CD8 but not CD20 antigens. No immunoglobulin synthesis was demonstrable. Although the same preparation was shown to be a T-independent polyclonal B-cell activator of murine cells, it preferentially triggers T cells in humans.

Induction of murine B cell proliferation and immunoglobulin synthesis by some bacterial ribosomes.

Ribosomal preparations from Klebsiella pneumoniae, Haemophilus influenzae, Streptococcus pyogenes, and Streptococcus pneumoniae were investigated with respect to their activating capacity towards murine lymphoid cells. The proliferation of BALB/c spleen cells was induced in a dose-dependent fashion (from 1 to 100 micrograms/ml) by ribosomes of K. pneumoniae, H. influenzae, and S. pyogenes with a peak activity at 48 or 72 hr of culture. The majority of the blast cells induced by these ribosomal preparations were positive for surface-immunoglobulin (S-Ig) and negative for Thy 1.2. Furthermore, K. pneumoniae, H. influenzae, and S. pyogenes ribosomes induced the synthesis of IgM and some IgA. Cell proliferation and induction of IgM production were also demonstrated with the 3 ribosomal preparations using spleen cells from athymic nude (nu+/nu+) mice, Lyb-5-defective CBA/N spleen cells, B cell-enriched and T cell-depleted BALB/c spleen cell suspensions, as well as spleen cells from the Ips gene-deficient C3H/HeJ strain. Cell culture supernatants contained specific anti-ribosome IgM antibodies. Antibodies of other specificities (anti-sheep erythrocytes) were also demonstrated in supernatants from K. pneumoniae-stimulated cultures. Evidence against a possible role of contamination of K. pneumoniae and H. influenzae ribosomes by lipopolysaccharide- or lipid A-associated proteins in this effect is discussed. Ribosomes from S. pneumoniae did not induce 3H-thymidine incorporation nor Ig production. None of the 4 ribosomal preparations was found to stimulate T cell blastogenesis or to induce interleukin-2 production by naive BALB/c spleen cells. Finally, ribosomes from H. influenzae, S. pyogenes, S. pneumoniae but not those of K. pneumoniae stimulated interleukin-1 production by adherent spleen cells, from BALB/c mice.

Polyclonal activation of murine B cells by a membrane proteoglycan of Klebsiella pneumoniae.

The lymphocyte activating properties of a membrane proteoglycan (MPG) extracted from a mutant non-encapsulated strain of Klebsiella pneumoniae (Kp) (biotype a I-145) were investigated. Kp MPG induced a strong proliferative response of BALB/c spleen cells and Peyer's patches cells. Thymidine incorporation was dose-related (from 1 to 100 micrograms Kp MPG/ml) and reached a maximum at day 3. It was not reduced by removal of most adherent cells, nor by depletion of Thy1-2 positive cells, but it was abrogated by removal of surface immunoglobulin bearing cells. Spleen cells from nude mice and those from C3H/Hej mice were strongly stimulated by Kp MPG. Conversely Kp MPG did not induce interleukin 2 production and did not trigger the proliferation of thymocytes but stimulated interleukin 1 production by adherent spleen cells. Finally, unfractionated or B-enriched spleen cells cultured with Kp MPG synthesized IgM and, to a lesser extent, IgG and IgA. It is concluded that Kp MPG is a T-independent polyclonal B cell activator and an inducer of interleukin 1 production.

[beta2-Microglobulin and experimental nephropathies in macacus monkey (author's transl)]. / Néphropathies expérimentales et beta2-microglobuline chez le singe.

In the monkey, the action of four renal toxics : lead acetate, sodium maleate, cadmium chloride and sodium chromate was compared. Tubulopathies were obtained only with cadmium chloride and sodium chromate with in the best cases about 16 mg/l of beta2-microglobulin (beta2m) in the urine. Monkey and human beta2m have the same molecular weight and are antigenically similar. However, they differed in electrophoretic mobility, the monkey beta2m being slightly more cathodic.