Pre-existing T cell immunity determines the frequency and magnitude of cellular immune response to two doses of mRNA vaccine against SARS-CoV-2.

Little is known about the factors associated with lack of T-cell response to mRNA vaccines against SARS-CoV-2. In a prospective cohort of 61 health care workers (HCWs), 21% and 16% after the first dose of mRNA BNT162b vaccine, and 12% and 7% after the second dose, showed lack of CD4+ and CD8+ T-cell response, respectively. Pre-existing T-cell immunity, due to past infection (46%) or cross-reactive cellular response (26%), was significantly associated with T-cell response in frequency (CD4+ T-cell, 100% vs 82% after two doses; p = 0.049) and in the magnitude of T-cell response during follow up. Furthermore, baseline CD4+ T-cell correlated positively with the titer of specific IgG-antibodies after first and second vaccine dose. Our data demonstrate that cross-reactive T-cells correlate with a better cellular response as well as an enhanced humoral response, and we confirm the close correlation of humoral and cellular response after mRNA vaccination.

BNT162b2 mRNA COVID-19 vaccine Reactogenicity: The key role of immunity.

We examined the impact of pre-existing SARS-CoV-2-specific cellular immunity on BNT162b2 mRNA COVID-19 vaccine reactogenicity. Of 96 healthcare workers (HCWs), 76% reported any vaccine reaction (first dose: 70%, second dose: 67%), none of which was severe. Following first dose, systemic reactions were significantly more frequent among HCWs with past infection than in infection-naïve individuals, and among HCWs with pre-existing cellular immunity than in those without it. The rate of systemic reactions after second dose was 1.7 and 2.0-times higher than after first dose among infection-naïve HCWs and those without pre-existing cellular immunity, respectively. Levels of SARS-CoV-2-specific T-cells before vaccination were higher in HCWs with systemic reactions after the first dose than in those without them. BNT162b2 vaccine reactogenicity after first dose is attributable to pre-existing cellular immunity elicited by prior COVID-19 or cross-reactivity. Reactogenicity following second dose suggests an immunity-boosting effect. Overall, these data may reduce negative attitudes towards COVID-19 vaccines. Study Registration. The study was registered on clinicaltrials.gov, NCT04402827.

T-cell response after first dose of BNT162b2 SARS-CoV-2 vaccine among healthcare workers with previous infection or cross-reactive immunity.

OBJECTIVES: Antibody response to the first dose of BNT162b2 SARS-CoV-2 is greater in COVID-19-convalescent than in infection-naïve individuals. However, there are no data about T-cell response in individuals with pre-existing cellular immunity. METHODS: We evaluated T-cell responses in parallel with SARS-CoV-2 antibody level after first dose of BNT162b2 vaccine in 23 infection-naïve and 27 convalescent healthcare workers (HCWs) previously included in a study about humoral and T-cell immunity. RESULTS: Overall, the antibody response was lower in the infection-naïve group than in convalescent individuals (18 895 vs 662.7 AU mL-1, P < 0.001), and intermediate but significantly lower in convalescent HCWs with previous negative serology (25 174 vs 1793 AU mL-1; P = 0.015). Indeed, anti-spike IgG titres after the first dose correlated with baseline anti-nucleocapsid IgG titres (rho = 0.689; P < 0.001). Pre-existing T-cell immunity was observed in 78% of convalescent and 65% of the infection-naïve HCWs. T-cell response after the first dose of the vaccine was observed in nearly all the cases with pre-existing T-cell immunity, reaching 94% in convalescent HCWs and 93% in those with cross-reactive T cells. It was lower in the infection-naïve group (50%; P = 0.087) and in convalescent HCWs with negative serology (56%; P = 0.085). Notably, systemic reactogenicity after vaccination was mainly observed in those with pre-existing T-cell immunity (P = 0.051). CONCLUSION: Here, we report that the first dose of BTN162b2 elicits a similar S-specific T-cell response in cases of either past infection or cross-reactive T cells, but lower in the rest of infection-naïve individuals and in convalescent HCWs who have lost detectable specific antibodies during follow-up.

A valid and reliable scale to assess cultural sensibility in nursing.

BACKGROUND: Cultural sensibility is an important concept linked to the achievement of cultural competence. Health professionals must first improve their cultural sensibility to become culturally competent and to be able to offer competent care to culturally diverse populations. Aim To develop and psychometrically test the Cultural Sensibility Scale for Nursing (CUSNUR), a cultural sensibility scale that can be used in nursing for the achievement of competencies needed to care for culturally diverse populations. DESIGN AND METHODS: The cross-sectional survey was conducted over two stages. The first stage involved the cross-cultural and discipline-specific adaptation of an existing scale addressing this concept in the field of law using the reverse translation method. Second, validation of the scale was carried out from October 2016-June 2017 by studying the psychometric properties of the questionnaire through an analysis of content acceptability and reliability and through exploratory factor analysis (EFA). RESULTS: The questionnaire was designed to be clear, easy to understand, and of adequate length, and experts involved in content validation agreed that the scale meets these criteria. A total of 253 nursing students participated in the validation stage. Four factors were identified from the EFA: (1) patient and health professional behaviours, (2) self-assessments, (3) self-awareness, and (4) cultural influence. Two items were excluded. Factorial saturation is adequate for all factors (>0.30). The Cronbach alpha was measured as 0.75. CONCLUSIONS: This study presents the first version of the CUSNUR and demonstrates that the scale is valid and reliable.

SARS CoV-2 infections in healthcare workers with a pre-existing T-cell response: a prospective cohort study.

OBJECTIVE: T-cell responses against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are observed in unexposed individuals. We evaluated the impact of this pre-existing cellular response on incident SARS-CoV-2 infections. METHODS: This was a follow-up study of 38 seronegative healthcare workers (HCWs) with previous evaluation of CD8+ and CD4+ T-cell responses after stimulation with SARS-CoV-2 structural proteins. Infection was considered in the presence of a positive RT-PCR test and/or confirmed seroconversion. RESULTS: Twenty of the 38 HCWs included (53%) had a previous specific CD8+ T-cell response to peptides encompassing the spike protein (S) in 13 (34%), the membrane (M) in 17 (45%), or/and the nucleocapsid (N) in three (8%). During a follow-up of 189 days (interquartile range (IQR) 172-195), 11 HCWs (29%) had an RT-PCR-positive test (n = 9) or seroconverted (n = 2). Median duration of symptoms was 2 days (IQR 0-7), and time to negative RT-PCR was 9 days (IQR 4-10). Notably, six incident infections (55%) occurred in HCWs with a pre-existing T-cell response (30% of those with a cellular response), who showed a significantly lower duration of symptoms (three were asymptomatic). Three of the six HCWs having a previous T-cell response continued to test seronegative. All the infected patients developed a robust T-cell response to different structural SARS-CoV-2 proteins, especially to protein S (91%). CONCLUSION: A pre-existing T-cell response does not seem to reduce incident SARS-CoV-2 infections, but it may contribute to asymptomatic or mild disease, rapid viral clearance and differences in seroconversion.

Exploiting the Microbiota for the Diagnosis of Anal Precancerous Lesions in Men Who Have Sex With Men.

BACKGROUND: While the microbiota has been associated with human papillomavirus malignant transformation, it is unclear whether anal bacteria could improve the low specificity of anal cytology for the screening of high-grade intraepithelial squamous neoplasia (HSIL). METHODS: We recruited men who have sex with men undergoing anal cytology and high-resolution anoscopy. We assessed the microbiota composition from fecal samples and cytobrush anal samples using 16S ribosomal DNA sequencing in participants with or without biopsy-proven HSIL (bHSIL). We selected bacterial biomarkers based on their linear discriminant analysis. We assessed their predictive performance using logistic regression and bootstrap resampling. RESULTS: We included 128 individuals, 47 (36.7%) with bHSIL and 99 (77.3%) with human immunodeficiency virus. We detected 40 potential predictors of bHSIL. Ruminococcaceae NK4A214 group, Alloprevotella genus, Prevotella melanonigenica, and Ruminococcaceae UCG-014 were the most predictive of bHSIL. From 35 false-positive cytologic results, the combination of these 4 biomarkers with the anal cytology reclassified to true-negative 33 individuals (94%) and showed good diagnostic performance (area under the receiver operating characteristic curve, 0.805; 95% confidence interval, .728-.882). CONCLUSIONS: We found anal-associated bacteria indicative of a higher risk of precancerous anal lesions, which combination was highly specific. The microbiota could be developed as a complementary diagnostic tool to overcome the limitations of the current screening strategy for anal cancer.

Zanja de aguas negras como criadero de stegomyia aegypti: aspecto entomológico a considerar en el control de la especie / Sewage ditch as breeding place of Stegomyia aegypti: entomological aspect to consider in the species control

Se reporta la presencia de Stegomyia aegypti, importante vector del dengue/dengue hemorrágico en un depósito raro, una zanja con vertimiento de aguas negras extremadamente poluida. Este hallazgo al parecer es el resultado de condicionantes desfavorable en el interior de las viviendas debido a las intensas y extensivas jornadas de tratamiento focal y adulticida ejecutadas en todo el universo urbano atendido por el policlínico. Por ello se deben extremar también las acciones de pesquisaje para detectar y destruir todo probable sitio de cría de mosquitos en el peridomicilio, implementar acciones de lucha integrada que incluyan biológicas, físicas, químicas y educativas según lo requiera para establecer barreras higiénico-epidemiológicas que impidan la presencia y dispersión de la especie en el territorio(AU)

The presence of Stegomyia aegypti is reported, important vector of the dengue/ hemorrhagic dengue in a rare deposit, a ditch with sewage pouring extremely polluted. This finding seems to be the result of unfavorable conditions inner homes due to the intense and extensive days of focal and adulticide treatment carried out in all the urban universe attended by the hospital. That is why inquiry actions should be extreme to detect and to destroy all probable mosquitos breeding place in the perihome, to implement integrated actions that include biological, physical, chemical and educational as required to establish sanitary-epidemiological barriers that prevent the presence and the spread of the species in the territory(AU)

Zanja de aguas negras como criadero de Stegomyia aegypti: Aspecto entomológico a considerar en el control de la especie / Sewage ditch as breeding place of Stegomyia aegypti: Entomological aspect to consider in the species control

Se reporta la presencia de Stegomyia aegypti, importante vector del dengue/dengue hemorrágico en un depósito raro, una zanja con vertimiento de aguas negras extremadamente poluida. Este hallazgo al parecer es el resultado de condicionantes desfavorable en el interior de las viviendas debido a las intensas y extensivas jornadas de tratamiento focal y adulticida ejecutadas en todo el universo urbano atendido por el policlínico. Por ello se deben extremar también las acciones de pesquisaje para detectar y destruir todo probable sitio de cría de mosquitos en el peridomicilio, implementar acciones de lucha integrada que incluyan biológicas, físicas, químicas y educativas según lo requiera para establecer barreras higiénico-epidemiológicas que impidan la presencia y dispersión de la especie en el territorio.

The presence of Stegomyia aegypti is reported, important vector of the dengue/ hemorrhagic dengue in a rare deposit, a ditch with sewage pouring extremely polluted. This finding seems to be the result of unfavourable conditions inner homes due to the intense and extensive days of focal and adulticide treatment carried out in all the urban universe attended by the hospital. That is why inquiry actions should be extreme to detect and to destroy all probable mosquitos breeding place in the perihome, to implement integrated actions that include biological, physical, chemical and educational as required to establish sanitary-epidemiological barriers that prevent the presence and the spread of the species in the territory.