Estudio descriptivo sobre el uso de ensayo de liberación de interferón gamma en población reclusa con prueba de tuberculina positiva en el Centro Penitenciario de Burgos / Interferon-gamma release assay for the diagnosis of latent tuberculosis infection in the prison population with a positive tuberculin test: a descriptive study in a prison (Burgos, Spain)

Objetivos: En prisiones, existe una alta prevalencia de reclusos que tienen una prueba de tuberculina (PT) positiva mayor de 10 mm y, en ocasiones, se realizan tratamientos para infección tuberculosa latente (ITL) innecesarios. El programa de prevención y control de la tuberculosis (TB) en el medio penitenciario no ha generalizado el uso de uso de QuantiFERON®-TB (QFT) en las cárceles. Nos propusimos describir la implementación y la utilidad del QFT en una población de internos con PT positiva y, de forma secundaria, detectar falsos positivos y evitar tratamientos innecesarios. Secundariamente se han analizado las distintas variables sociodemográficas de la población reclusa. Material y método: Entre diciembre de 2020 y diciembre de 2021, de una población promedio de 300 internos de la cárcel de Burgos, se analizaron todas las pruebas de PT positivas. A todos estos casos positivos, se les midió el valor del QFT. Se analizaron diferentes variables sociodemográficas, y finalmente se evaluó la cantidad de internos con PT positiva, pero con resultado de QFT negativo. Resultados: Un total de 41 internos fueron incluidos en el estudio, con una edad media de 44 años. La proporción de internos nacidos en España fue del 56%, el resto habían nacido en otros países. El 48,8% de todas las PT positivas, fueron QFT negativo. De los 21 internos con QFT+, 12 (57%) estaban vacunados con bacilo de Calmette y Guérin (BCG). Discusión: Se ha observado que el QFT es un método seguro para el diagnóstico de la ITL en prisiones, y que su utilización contribuiría a una selección más específica de los internos que realmente necesitan un tratamiento para ITL. (AU)

Objectives: A high prevalence of prison inmates have a positive tuberculin skin test (TST) and sometimes unnecessary treatment for latent tuberculosis infection (LTBI) is prescribed. The prison tuberculosis prevention and control program has not generalized the use of QuantiFERON (QFT) in prisons. We set out to describe the implementation and usefulness o QFT in a population of inmates with positive TST, and to detect false positives and avoid unnecessary treatments. We also analysed the sociodemographic variables of the inmate population. Material and methods: All the positive TST tests between December 2020 and December 2021 from an average population of 300 inmates in Burgos prison were analysed. The QFT value was measured in all the positive cases. Sociodemographic variables were analysed and finally the number of inmates with positive TST, but with a negative QFT result and therefore not requiring LTBI treatment, was evaluated. Results: A total of 41 inmates were included in the study, with a mean age of 44 years. The proportion between Spanish inmates and foreigners was similar. Of all the positive TST, 48.8% were QFT negative. Discussion: It was observed that QFT is a safe method for the diagnosis of LTBI in prisons and that its use would contribute to a more specific selection of inmates who actually need chemoprophylactic treatment for LTBI. (AU)

HIV and HCV screening by non-infectious diseases physicians: can we improve testing and hidden infection rates?

Background: Missed opportunities for Human Immunodeficiency Virus (HIV) and Hepatitis C Virus (HCV) testing remain high. We aimed to ascertain the knowledge of screening guidelines and attitudes of non-infectious disease (ID) hospital physicians and assess the impact of a 1-h session on screening rates and diagnoses. Methods: This interventional study consisted of a 1-h training session on HIV and HCV epidemiology and testing guidelines for non-ID physicians. Pre-and post-session questionnaires compared the knowledge of the guidelines and attitudes toward screening before and after the session. Rates of screening and diagnoses were compared in three 6 months periods: before, immediately after, and 24 months ±4 after the session. Results: A total of 345 physicians from 31 departments participated in these sessions. Before the session, 19.9% (28% medical, 8% surgical) and 17.9% (30% medical, 2.7% surgical) were aware of HIV and HCV testing guidelines, respectively. The willingness to routinely test increased from 5.6 to 22%, whereas not ordering tests decreased from 34.1 to 2.4%. HIV screening rates significantly increased by 20% after the session (7.7 vs. 9.3 tests per 103 patients; p < 0.001), and the effect persisted until the long-term period. The HIV diagnosis rate increased globally (3.6 vs. 5.2 HIV diagnoses per 105 patients; p = 0.157), mainly because of medical services (4.7 vs. 7.7 per 105 patients; p = 0.082). The HCV screening rate increased significantly immediately and in the long term only in medical services (15.7 and 13.6%, respectively). The new active HCV infection rates increased immediately and declined steeply thereafter. Conclusion: A short session for non-ID physicians can improve HIV/HCV screening, increase diagnosis, and contribute to disease elimination.

Interferon-gamma release assay for the diagnosis of latent tuberculosis infection in the prison population with a positive tuberculin test: a descriptive study in a prison (Burgos, Spain).

OBJECTIVES: A high prevalence of prison inmates have a positive tuberculin skin test (TST) and sometimes unnecessary treatment for latent tuberculosis infection (LTBI) is prescribed. The prison tuberculosis prevention and control program has not generalized the use of QuantiFERON (QFT) in prisons. We set out to describe the implementation and usefulness of QFT in a population of inmates with positive TST, and to detect false positives and avoid unnecessary treatments. We also analysed the sociodemographic variables of the inmate population. MATERIAL AND METHODS: All the positive TST tests between December 2020 and December 2021 from an average population of 300 inmates in Burgos prison were analysed. The QFT value was measured in all the positive cases. Sociodemographic variables were analysed and finally the number of inmates with positive TST, but with a negative QFT result and therefore not requiring LTBI treatment, was evaluated. RESULTS: A total of 41 inmates were included in the study, with a mean age of 44 years. The proportion between Spanish inmates and foreigners was similar. Of all the positive TST, 48.8% were QFT negative. DISCUSSION: It was observed that QFT is a safe method for the diagnosis of LTBI in prisons and that its use would contribute to a more specific selection of inmates who actually need chemoprophylactic treatment for LTBI.

The evolution of the HIV-1 protease folding stability.

The evolution of structural proteins is generally constrained by the folding stability. However, little is known about the particular capacity of viral proteins to accommodate mutations that can potentially affect the protein stability and, in general, the evolution of the protein stability over time. As an illustrative model case, here, we investigated the evolution of the stability of the human immunodeficiency virus (HIV-1) protease (PR), which is a common HIV-1 drug target, under diverse evolutionary scenarios that include (1) intra-host virus evolution in a cohort of seventy-five patients sampled over time, (2) intra-host virus evolution sampled before and after specific PR-based treatments, and (3) inter-host evolution considering extant and ancestral (reconstructed) PR sequences from diverse HIV-1 subtypes. We also investigated the specific influence of currently known HIV-1 PR resistance mutations on the PR folding stability. We found that the HIV-1 PR stability fluctuated over time within a constant and wide range in any studied evolutionary scenario, accommodating multiple mutations that partially affected the stability while maintaining activity. We did not identify relationships between change of PR stability and diverse clinical parameters such as viral load, CD4+ T-cell counts, and a surrogate of time from infection. Counterintuitively, we predicted that nearly half of the studied HIV-1 PR resistance mutations do not significantly decrease stability, which, together with compensatory mutations, would allow the protein to adapt without requiring dramatic stability changes. We conclude that the HIV-1 PR presents a wide structural plasticity to acquire molecular adaptations without affecting the overall evolution of stability.

CD4+:CD8+ T-cell ratio changes in people with HIV receiving antiretroviral treatment.

BACKGROUND: Cofactors associated with persistently abnormal CD4+:CD8+ T-cell ratio in people with HIV (PWH) on antiretroviral treatment (ART) might change over time as the population of people with HIV ages or as new ART drugs become available. The main objective of our study was to determine the long-term associations of baseline factors, including the CD4+ T-cell count and ratio, with ratio normalization (≥1). In addition to this, we explored whether the ratio remained associated with the risk of both AIDS and non-AIDS events among individuals on suppressive ART. METHODS: Clinic-based study in a tertiary, university hospital in Madrid. People with HIV starting a first-line ART regimen (January 2006-June 2017) were included in a prospective national multicentre cohort (CoRIS). People with controlled HIV-infection within the first year of ART initiation and complete CD4+ and CD8+ T-cell records were selected. Cox proportional hazard (PH) regression models were used to estimate the cumulative incidence of ratio normalization and to examine associations with socio-demographic and clinical variables. To investigate factors independently associated with the development of AIDS and non-AIDS events we used a time updated Poisson regression model. RESULTS: The study included 557 subjects. During follow-up (median 5.24 years), 44% of participants achieved a ratio of 1 within a median of 1.49 years. In a multivariate PH model, pre-ART factors negatively associated with ratio normalization were the pre-ART CD4+:CD8+ T-cell ratio and mode of HIV acquisition. For the secondary analysis, 1.3 events/100 person years of follow-up were observed. After adjustment, older age, HIV RNA >200 copies/ml and CD4+:CD8+ T-cell ratios over follow-up, remained significantly associated with the development of AIDS and non-AIDS events. In contrast, pre-ART ratio was not associated with the risk of AIDS and non-AIDS events. CONCLUSIONS: In summary, our study showed that higher pre-ART CD4+:CD8+ T-cell ratio is associated with rates of ratio normalization ≥1. In addition, the risk of AIDS and non-AIDS events seems to be predicted by the time updated CD4+:CD8+ T-cell ratio not by the pre-ART CD4+:CD8+ T-cell ratio. Therefore, CD4+:CD8+ T-cell ratio should be considered as a dynamic marker for translation into clinical practice.

Tratamiento vía Internet con contactos semanales por e-mail utilizado en una unidad de tabaquismo: utilidad clínica y predictores de éxito / An Internet treatment with weekly e-mail contacts used in a Tobacco Unit: clinical utility and predictors of outcome

Este trabajo presenta datos preliminares sobre la utilidad clínica y los predictores de éxito de la "Página web de San Francisco para dejar de fumar" (San Francisco Stop Smoking Internet Site, SFSSIS; Lenert et al., 2003) junto a contactos semanales vía e-mail y el tratamiento farmacológico habitual. Cincuenta fumadores participaron en la presente serie de casos, 24 varones y 26 mujeres, con una edad media de 43,24 (DT = 10,24) años. Treinta y dos participantes comienzan el tratamiento. La tasa de abstinencia en el postratamiento es de 78,1% y en el seguimiento al año es de 53,1%. El mejor predictor de éxito en el postratamiento es la puntuación en el Inventario para la depresión de Beck(R2 = 0,46; β = 0,51; p < 0,05), en cambio en el seguimiento al año son la cooximetría (β1 = 0,39; p < 0,05) y la edad de comienzo a fumar (R2 = 0,60; β2 = 0,43; p < 0,05). Es importante destacar que los participantes están motivados para comenzar el tratamiento y satisfechos al finalizarlo. Estos resultados preliminares apoyan la utilidad clínica del SFSSIS para dejar de fumar

This work presents preliminary data on the clinical utility and outcome predictors of The San Francisco Stop Smoking Internet Site (SFSSIS) (Lenert et al., 2003) used with weekly e-mail contacts and the usual pharmacological treatment. Fifty smokers participated in the current series of cases, 24 males and 26 females, with an age average of 43.24 (SD = 10.24) years old. Thirty-two of the participants started the treatment. The abstinence rate in the postreatment is 78.1% and in the one year follow-up 53.1%. The best outcome predictor in the postreatment is the Beck Depression Inventory score (R2 = 0.46, β = 0.51, p < 0.05), however in the one year follow-up the predictors are the carbon monoxide test (β1 = 0.39, p < 0.05) and the age at time of starting to smoke (R2 = 0.60, β2 = 0.43, p < 0.05). It is important to emphasize that the participants were motivated to start the treatment and satisfied with it at the end. These preliminary results support the clinical utility of the SFSSIS for giving up smoking

Rheological and volumetric properties of TiO2-ethylene glycol nanofluids.

Homogeneous stable suspensions obtained by dispersing dry TiO2 nanoparticles in pure ethylene glycol were prepared and studied. Two types of nanocrystalline structure were analyzed, namely anatase and rutile phases, which have been characterized by scanning electron microscopy. The rheological behavior was determined for both nanofluids at nanoparticle mass concentrations up to 25%, including flow curves and frequency-dependent storage and loss moduli, using a cone-plate rotational rheometer. The effect of temperature over these flow curve tests at the highest concentration was also analyzed from 283.15 to 323.15 K. Furthermore, the influence of temperature, pressure, nanocrystalline structure, and concentration on the volumetric properties, including densities and isobaric thermal expansivities, were also analyzed.

Psychometric properties of the Situational Inventory of Body-Image Dysphoria-Short form in a Spanish sample.

The primary objective of this study was to translate and validate Situational Inventory of Body-Image Dysphoria-Short form (SIBID-S) in a Spanish population. The scale consists of 20 items to assess the frequency of dysphoric body-image emotions in certain situational contexts, using a five-point rating scale. The questionnaire was administered to 214 women between the ages of 14 and 29 years, from primary and secondary schools and a university. Principal components analysis indicated a one-factor structure for the entire sample and both younger (<18) and older (>or=18) participants. Internal consistency was high (0.94), and the test-retest reliability over 1 month ranged between 0.89 and 0.93. The SIBID-S showed good convergent validity in relation to other pertinent measures of body image, eating pathology, and self-esteem. Moreover, the SIBID-S was differentiated low-risk, subclinical eating disturbed, and clinical eating disordered patients. Results support the potential utility of the SIBID-S in the Spanish female population, including a younger group than previously studied, as well as its usefulness in the assessment of body image among females varying in degrees of eating pathology.