Vaccination trends in people with HIV infection participanting in the hospital-based survey of patients infected with HIV, 2006-2021.

OBJECTIVE: To assess the trend in hepatitis A, hepatitis B, pneumococcal, tetanus and seasonal influenza vaccination in people with HIV infection and to analyse associated factors. METHODS: The Hospital Survey of Patients with HIV, an annual cross-sectional study conducted on a fixed day (2006-2021), was used. Inpatients and outpatients were included. Trends in vaccination and associated factors were analysed using logistic regression. RESULTS: A total of 8643 participants were included. Vaccination rates increased to 65.3% for hepatitis A, 83.7% for hepatitis B, 49.3% for tetanus, 68.9% for pneumococcal and 74.5% for seasonal influenza in 2021. Factors positively associated with vaccination were older age for pneumococcal and influenza vaccination; higher educational level for hepatitis A and tetanus; living in a closed institutions or prison for tetanus, pneumococcal and influenza; and having acquired HIV through sex between men for hepatitis A, B and pneumococcal. In addition, being on antiretroviral treatment and having a high CD4 count were positively associated with vaccination for all these diseases. Factors inversely associated with vaccination were being older (hepatitis A, B and tetanus), being an immigrant (tetanus and seasonal influenza) and being an injection drug user/ex-user for hepatitis A and B. CONCLUSIONS: Vaccination in people with HIV has increased in the study period. The results are in line with the recommendations in this population, although there is still room to reach the established vaccination indicators.

Self-rated health among people living with HIV in Spain in 2019: a cross-sectional study.

BACKGROUND: HIV infection has become a chronic disease and well-being of people living with HIV (PLHIV) is now of particular concern. The objectives of this paper were to describe self-rated health among PLHIV, on ART and on ART virally suppressed and to analyse its determinants. METHODS: Data were obtained from a second-generation surveillance system based on a cross-sectional one-day survey in public hospitals. Epidemiological and clinical data were collected among HIV-infected inpatients and outpatients receiving HIV-related care the day of the survey in 86 hospitals in 2019. Self-rated health was measured using a question included in the National Health Survey: "In the last 12 months, how would you rate your health status?" an ordinal variable with five categories (very good, good, moderate, bad and very bad). For the analysis, these responses were dichotomized into two categories: 1 = very good/good and 0 = moderate, bad or very bad health status. Factors associated with very good/good self-rated health were estimated using logistic regression. RESULTS: Of 800 PLHIV, 67.5% perceived their health as very good/good, 68.4% among PLHIV on ART and 71.7% of those virally suppressed. Having university education (adjusted odds ratio (aOR):2.1), being unemployed (aOR:0.3) or retired (aOR:0.2), ever being diagnosed of AIDS (aOR:0.6), comorbidities (aOR:0.3), less than 2 year since HIV diagnosis (aOR:0.3) and not receiving ART (aOR:0.3) were associated with good self-rated health. Moreover, among PLHIV on ART, viral load less than 200 copies (aOR:3.2) were related to better perceived health. Bad adherence was inversely associated with good self-rated health among PLHIV on ART (aOR:0.5) and of those virally suppressed (aOR:0.4). CONCLUSIONS: Nearly seven in 10 PLHIV in Spain considered their health status as very good/good, being higher among virally suppressed PLHIV. Both demographic and clinical determinants affect quality of life.

Occurrence of apomictic conspecifics and ecological preferences rather than colonization history govern the geographic distribution of sexual Potentilla puberula.

The geographic distribution of sexual-apomictic taxa (i.e., comprising individuals usually reproducing either sexually or asexually via seeds) is traditionally thought to be driven by their ecological preferences and colonization histories. Where sexuals and apomicts get into contact with each other, competitive and reproductive interactions can interfere with these factors, an aspect which hitherto received little attention in biogeographic studies. We disentangled and quantified the relative effects of the three factors on the distribution of tetraploid sexuals in Potentilla puberula in a latitudinal transect through the Eastern European Alps, in which they are codistributed with penta-, hepta-, and octoploid apomictic conspecifics. Effects were explored by means of binomial generalized linear regression models combining a single with a multiple predictor approach. Postglacial colonization history was inferred from population genetic variation (AFLPs and cpDNA) and quantified using a cost distance metric. The study was based on 235 populations, which were purely sexual, purely apomictic, or of mixed reproductive mode. The occurrence of apomicts explained most of the variation in the distribution of sexuals (31%). Specifically, the presence of sexual tetraploids was negatively related to the presence of each of the three apomictic cytotypes. Effects of ecological preferences were substantial too (7% and 12% of the total variation explained by ecological preferences alone, or jointly with apomicts' occurrence, respectively). In contrast, colonization history had negligible effects on the occurrence of sexuals. Taken together, our results highlight the potentially high impact of reproductive interactions on the geographic distribution of sexual and apomictic conspecifics and that resultant mutual exclusion interrelates to ecological differentiation, a situation potentially promoting their local coexistence.

Difference in reproductive mode rather than ploidy explains niche differentiation in sympatric sexual and apomictic populations of Potentilla puberula.

Apomicts tend to have larger geographical distributional ranges and to occur in ecologically more extreme environments than their sexual progenitors. However, the expression of apomixis is typically linked to polyploidy. Thus, it is a priori not clear whether intrinsic effects related to the change in the reproductive mode or rather in the ploidy drive ecological differentiation. We used sympatric sexual and apomictic populations of Potentilla puberula to test for ecological differentiation. To distinguish the effects of reproductive mode and ploidy on the ecology of cytotypes, we compared the niches (a) of sexuals (tetraploids) and autopolyploid apomicts (penta-, hepta-, and octoploids) and (b) of the three apomictic cytotypes. We based comparisons on a ploidy screen of 238 populations along a latitudinal transect through the Eastern European Alps and associated bioclimatic, and soil and topographic data. Sexual tetraploids preferred primary habitats at drier, steeper, more south-oriented slopes, while apomicts mostly occurred in human-made habitats with higher water availability. Contrariwise, we found no or only marginal ecological differentiation among the apomictic higher ploids. Based on the pronounced ecological differences found between sexuals and apomicts, in addition to the lack of niche differentiation among cytotypes of the same reproductive mode, we conclude that reproductive mode rather than ploidy is the main driver of the observed differences. Moreover, we compared our system with others from the literature, to stress the importance of identifying alternative confounding effects (such as hybrid origin). Finally, we underline the relevance of studying ecological parthenogenesis in sympatry, to minimize the effects of differential migration abilities.

Acute flaccid paralysis (AFP) surveillance: challenges and opportunities from 18 years' experience, Spain, 1998 to 2015.

Acute flaccid paralysis (AFP) surveillance is key for global polio eradication. It allows detecting poliovirus (PV) reintroductions from endemic countries. This study describes AFP surveillance in Spain from 1998 to 2015. During this time, 678 AFP cases were reported to the Spanish National Surveillance Network. The mean notification rate was 0.58 AFP cases/100,000 population under 15 years old (range: 0.45/100,000-0.78/100,000). Two periods (P) are described: P1 (1998-2006) with the AFP notification rate ranging from 0.66/100,000 to 0.78/100,000, peaking in 2001 (0.84/100,000); and P2 (2007-2015) when the AFP rate ranged from 0.43/100,000 to 0.57/100,000, with the lowest rate in 2009 (0.31/100,000). No poliomyelitis cases were caused by wild PV infections, although two Sabin-like PVs and one imported vaccine-derived PV-2 were detected. Overall, 23 (3.4%) cases met the hot case definition. Most cases were clinically diagnosed with Guillain-Barré syndrome (76.9%; 504/655). The adequate stool collection rate ranged from 33.3% (7/21) to 72.5% (29/40). The annual proportion of AFP cases with non-polio enterovirus findings varied widely across the study period. AFP surveillance with laboratory testing for non-polio enteroviruses must be maintained and enhanced both to monitor polio eradication and to establish sensitive surveillance for prompt detection of other enteroviruses causing serious symptoms.

Pollen precedence in sexual Potentilla puberula and its role as a protective reproductive barrier against apomictic cytotypes.

Cross-pollination is a major factor determining the demographic dynamics of mixed-ploidy populations. Typically, rare cytotypes are suppressed due to reduced female fertility by losing gametes in heteroploid crosses (i.e., through minority cytotype exclusion). In species with reproductive differentiation into sexual and apomictic cytotypes, sexuals might be reproductively suppressed by apomicts (or transformed due to introgression of apomixis genes). Pollen precedence potentially acts as a post-pollination pre-fertilization barrier protecting sexuals against their apomictic counterparts. We estimated the role of pollen precedence as a barrier against cross-fertilization of tetraploid sexuals by penta- and heptaploid gametophytic apomicts in Potentilla puberula (Rosaceae) by means of controlled crosses, and inference of the paternity through DNA ploidy estimation of embryos. Individuals from five regions spanning an elevational and biogeographic gradient were used to account for the variation in the relative frequencies of reproductive modes across the study area. We tested (1) whether the application of heteroploid pollen (sexual × apomictic) causes a reduction of seed yield compared to homoploid crosses (sexual × sexual), and (2) if so, whether pollen precedence recovers the seed yield in simultaneous applications of pollen from sexuals and apomicts (mixed-ploidy). Seed yield was significantly lower in hetero- than in homoploid crosses. We found clear evidence for precedence of homoploid pollen, despite a 13% to 15% of embryos experienced a change in ploidy due to heteroploid fertilizations. Thus, our study indicates that pollen precedence operates as a barrier against intercytotype fertilization in P. puberula, promoting the integrity of the sexual cytotype and their co-existence with apomictic individuals.

Sexual intraspecific recombination but not de novo origin governs the genesis of new apomictic genotypes in Potentilla puberula (Rosaceae).

Apomixis - asexual reproduction via seeds - might arise de novo following polyploidisation events, or via reproductive transfer of apomixis. Both processes can be obtained within species or via hybridisation. We aimed to determine the origin of apomictic genotypes in Potentilla puberula, a rosaceous species showing reproductive differentiation with ploidy: sexual tetraploids and apomictic penta- to octoploids, which regularly co-occur in sympatry. The study is based on 726 individuals, comprising all cytotypes, collected from 138 populations in the Eastern European Alps. We established relationships of cytotypes based on AFLP fingerprinting and cpDNA sequencing to test (1) whether the apomicts are of recurrent allopolyploid origin or originated from within the species via autopolyploidy, and (2) whether there are indications for reproductive transfer versus de novo origin of apomixis. Three principal pathways were identified which explain the origin of new apomictic genotypes, all involving at least one apomictic parent and thus compatible with the idea of reproductive transfer of the apomictic trait to the progeny: (1) self-fertilisation of unreduced egg cells in apomicts; (2) cross-fertilisation among apomicts; and (3) occasionally, heteroploid crosses among sexuals and apomicts. Autopolyploids derived from tetraploid sexuals were repeatedly observed, but did not express apomixis. Finally, our results suggest no role of other species in the origin of extant apomictic genotypes of P. puberula, although local hybrids with P. crantzii were identified. In conclusion, our results show that the formation of new apomictic genotypes required a genetic contribution from at least one apomictic parent. This finding is in accordance with the idea that apomixis is inheritable in P. puberula. On the contrary, lack of apomixis in penta- and hexaploids derived from sexual backgrounds did not support the hypothesis of a de novo origin of apomixis. Relatively high frequency of remnant sexuality in the apomicts involving different cytological pathways of seed formation can explain their high cytological and genotypic diversity. Finally, lack of global introgression from a third taxon is in support of P. puberula as a concise, although highly diverse, species.

Widening the Access to HIV Testing: The Contribution of Three In-Pharmacy Testing Programmes in Spain.

BACKGROUND AND OBJECTIVE: Spain has implemented several in-pharmacy HIV testing programmes performed by pharmacists as part of their everyday routine. We aim to assess the feasibility and the main outcomes of three programmes implemented in three Spanish regions with different sociological profiles and also different epidemiology for HIV. METHODS: The characteristics of the 24151 people tested between 2009 and 2013 at 74 urban pharmacies are studied. We compare the main outcomes of the programmes with those of each Regional HIV Surveillance System (RHSS) assessing the contribution to the total new diagnosis in each region and if priority groups are being reached. RESULTS: 45.7% were heterosexual men (MSW), 14.4% men who have sex with men (MSM), and 27% women. The 35% were younger than 30 and 9.6% foreigners. The 52% were previously untested, and women were the most likely to be untested. The three programmes altogether diagnosed 226 people, resulting in a global prevalence of 0.9% (95%CI: 0.8-1.1); 3.4% in MSM (95%CI: 2.8-4.0). The prevalence among Spaniards was 0.8% (0.7-1.0) vs. 2.2 (1.6-2.9) among foreigners. The percentages of MSM diagnosed by all three programmes were higher than the one reported by their respective RHSS. Thirty four percent of the reactive MSM and the 71.4% of the reactive MSW did not have a previous HIV test although big testing history differences were observed across the programmes. Altogether, these services contributed with the 10.6% of all HIV diagnoses in these regions. CONCLUSIONS: In-pharmacy HIV testing programmes are a valuable testing option, having been able to uncover 1 out of 10 the new diagnoses reported in each region. They showed a good capacity of reaching and diagnosing previously untested populations, not only a priority population such as MSM but also heterosexual population who are more affected by delayed diagnosis. They seem to be particularly suitable for regions without large cities and specific HIV diagnostic services.

Determinantes de la asistencia irregular a consulta médica en pacientes con infección por el virus de la inmunodeficiencia humana: resultados de la Encuesta Hospitalaria de pacientes con el virus de la inmunodeficiencia humana, 2002-2012 / Factors determining irregular attendance to follow-up visits among human immunodeficiency virus patients: Results of the hospital survey of patients infected with human immunodeficiency virus

INTRODUCCIÓN: Describir la frecuencia de la asistencia irregular a consulta médica de pacientes con VIH y analizar sus determinantes. MÉTODOS: Estudio transversal realizado anualmente (2002-2012) en un día prefijado. Se recogen datos epidemiológicos, clínicos y conductuales de los pacientes con VIH (hospitalizados y ambulatorios) atendidos ese día en los hospitales públicos participantes. Se definió «asistencia irregular a consulta» como asistencia a consulta de forma esporádica, según la valoración del médico. Se realizó un análisis descriptivo, bivariante y multivariante de regresión logística para estimar los factores asociados a asistencia irregular a la consulta. RESULTADOS: En total se incluyeron 7.304 pacientes de los que el 13,7% acudían irregularmente a la consulta. La probabilidad de asistencia irregular aumentó en pacientes entre 25 y 49 años, subsaharianos o latinoamericanos, con menor nivel de estudios, aquellos sin domicilio fijo o que estaban en prisión, los que vivían solos o en establecimientos colectivos, los desempleados o jubilados, los que se infectaron por compartir material de inyección, los que no usaron condón en su última relación sexual y los inyectores activos. Por el contrario, los pacientes diagnosticados hacía menos de un año y los hombres homo/bisexuales tenían menor probabilidad de acudir irregularmente. CONCLUSIÓN: A pesar de la universalidad de nuestro sistema de salud existen variables sociales y demográficas que actúan como barreras para la asistencia a consulta, lo que puede comprometer la efectividad del tratamiento en determinados grupos de población. Estos determinantes deberían tenerse en cuenta a la hora de planificar políticas de control de la infección por el VIH

INTRODUCTION: To describe the occurrence of non-regular attendance to follow-up visits among HIV patients and to analyze the determining factors. METHODS: One-day survey carried out annually (2002-2012) in public hospitals. Epidemiological, clinical and behavioral data are collected in all HIV-infected inpatients and outpatients receiving HIV-related care on the day of the survey. «Non-regular attendance to a follow-up visit» was defined as sporadic attendance to the medical appointments, according to the judgment of the attending physician. Descriptive and bivariate analyses were performed, and factors associated to non-regular attendance to follow-up visits were estimated using logistic regression. RESULTS: A total of 7,304 subjects were included, of whom 13.7% did not attend medical appointments regularly. Factors directly associated with non-regular attendance were: age between 25-49 years; birth in Sub-Saharan Africa or Latin-America; low educational level; being homeless or in prison; living alone or in closed institutions; being unemployed or retired; being an intravenous drug user; not using a condom at last sexual encounter, and injecting drugs in the last 30 days. Conversely, HIV diagnosis within the last year and being men who have sex with men were factors inversely associated with non-regular attendance to follow-up visits. CONCLUSION: In spite of health care beings free of charge for everyone in Spain, social factors can act as barriers to regular attendance to medical appointments, which, in turn, can endanger treatment effectiveness in some population groups. This should be taken into account when planning HIV policies in Spain

[Factors determining irregular attendance to follow-up visits among human immunodeficiency virus patients: results of the hospital survey of patients infected with human immunodeficiency virus]. / Determinantes de la asistencia irregular a consulta médica en pacientes con infección por el virus de la inmunodeficiencia humana: resultados de la Encuesta Hospitalaria de pacientes con el virus de la inmunodeficiencia humana, 2002-2012.

INTRODUCTION: To describe the occurrence of non-regular attendance to follow-up visits among HIV patients and to analyze the determining factors. METHODS: One-day survey carried out annually (2002-2012) in public hospitals. Epidemiological, clinical and behavioral data are collected in all HIV-infected inpatients and outpatients receiving HIV-related care on the day of the survey. "Non-regular attendance to a follow-up visit" was defined as sporadic attendance to the medical appointments, according to the judgment of the attending physician. Descriptive and bivariate analyses were performed, and factors associated to non-regular attendance to follow-up visits were estimated using logistic regression. RESULTS: A total of 7,304 subjects were included, of whom 13.7% did not attend medical appointments regularly. Factors directly associated with non-regular attendance were: age between 25-49 years; birth in Sub-Saharan Africa or Latin-America; low educational level; being homeless or in prison; living alone or in closed institutions; being unemployed or retired; being an intravenous drug user; not using a condom at last sexual encounter, and injecting drugs in the last 30 days. Conversely, HIV diagnosis within the last year and being men who have sex with men were factors inversely associated with non-regular attendance to follow-up visits. CONCLUSION: In spite of health care beings free of charge for everyone in Spain, social factors can act as barriers to regular attendance to medical appointments, which, in turn, can endanger treatment effectiveness in some population groups. This should be taken into account when planning HIV policies in Spain.

Patrón de inicio del seguimiento clínico en los pacientes con infección por el virus de la inmunodeficiencia humana en España / Linkage to care among new human immunodeficiency virus diagnoses in Spain

OBJETIVO: Describir el tiempo trascurrido desde el diagnóstico de la infección por el VIH hasta el inicio del seguimiento clínico en España y estimar los factores asociados al inicio de seguimiento correcto. Métodos Se calculó la distribución del intervalo entre las fechas del diagnóstico de VIH y la primera determinación de CD4 (considerada la fecha de inicio de seguimiento) entre los nuevos diagnósticos notificados en 2010 en las 7 comunidades autónomas participantes. Se consideró «inicio correcto» si este intervalo era < 3 meses. Se estimaron mediante regresión logística los factores asociados al inicio correcto. Resultados De los 1.769 nuevos diagnósticos del 2010, el 83,1% inició seguimiento en el primer año tras el diagnóstico y el 75,7% antes de 3 meses. Los usuarios de drogas inyectadas (UDI) tuvieron una probabilidad de inicio correcto significativamente menor (OR = 0,3; IC del 95%, 0,2-0,6).Conclusión En España, el inicio del seguimiento clínico tras el diagnóstico de VIH se hace en un tiempo razonable, pero hay margen de mejora y los UDI están en desventaja

OBJECTIVE: To describe linkage to care among new HIV diagnoses in Spain; and to estimate factors associated to linkage to care within three months after diagnosis. METHODS: The distribution of the time elapsing between the date of HIV diagnosis and the date of first determination of CD4 (considered to be the date of linkage to care) was calculated among new HIV diagnoses in 2010 in the seven Autonomous Regions participating, where data on date of CD4 count was available. Linkage to care was considered «correct» if done within three months after diagnosis. Factors associated to correct linkage to care were estimated using logistic regression. RESULTS: A total of 1769 new HIV diagnoses were included. Of them, 83.1% had evidence of linkage to care within a year, and 75.7% were linked within three months after diagnosis. Being an injectable drug user(IDU) was the only factor inversely associated with linkage to care within 3 months (OR = 0.3; 95% CI:0.2-0.6)

[Linkage to care among new human immunodeficiency virus diagnoses in Spain]. / Patrón de inicio del seguimiento clínico en los pacientes con infección por el virus de la inmunodeficiencia humana en España.

OBJETIVE: To describe linkage to care among new HIV diagnoses in Spain; and to estimate factors associated to linkage to care within three months after diagnosis. METHODS: The distribution of the time elapsing between the date of HIV diagnosis and the date of first determination of CD4 (considered to be the date of linkage to care) was calculated among new HIV diagnoses in 2010 in the seven Autonomous Regions participating, where data on date of CD4 count was available. Linkage to care was considered «correct¼ if done within three months after diagnosis. Factors associated to correct linkage to care were estimated using logistic regression. RESULTS: A total of 1769 new HIV diagnoses were included. Of them, 83.1% had evidence of linkage to care within a year, and 75.7% were linked within three months after diagnosis. Being an injectable drug user (IDU) was the only factor inversely associated with linkage to care within 3 months (OR = 0.3; 95% CI: 0.2-0.6). CONCLUSION: In Spain linkage to care after HIV diagnosis is good, but there is still room for improvement, especially among IDUs.

[Seroprevalence of infection due to Echinococcus granulosus in the population of Castilla and León (Spain)]. / Seroprevalencia de infección por Echinococcus granulosus en la población de Castilla y León.

INTRODUCTION: Human hydatidosis is a prevalent zoonotic disease in the Castilla y León region of Spain. The aim of this study is to investigate the seroprevalence of Echinococcus granulosus infection in this region. METHODS: We studied 4824 serum samples from a random, representative population of healthy individuals from each province of Castilla y León, obtained over one year. An indirect enzyme-immunoassay developed in our laboratory was used to determine the presence of IgG antibodies against Echinococcus granulosus in these samples. RESULTS: IgG antibodies against Echinococcus granulosus were detected in 3.4% (164/4824) of samples studied, with a range of 1.26% to 7.10%, depending on the province. Antibody seroprevalence increased significantly with age, but there was no significant sex-related difference (3.66% men vs. 3.14% women). CONCLUSION: The seroprevalence of Echinococcus granulosus infection in Castilla y León is still high. These data contribute to hydatidosis surveillance within the control program for this disease.

Seroprevalencia de infección por Echinococcus granulosus enla población de Castilla y León / Seroprevalence of infection due to Echinococcus granulosus in the population of Castilla and León (Spain)

INTRODUCCIÓN. La hidatidosis es una de las zoonosis más importantes en la Comunidad Autónoma de Castilla y León. Este estudio pretende conocer la seroprevalencia de infección por Echinococcus granulosus en dicha comunidad autónoma. MÉTODOS. Se han estudiado 4.824 muestras de suero pertenecientes a 4.824 personas seleccionadas de forma aleatoria y que constituían una muestra representativa de la población de las provincias de Castilla y León. En cada suero se estudió la presencia de anticuerpos de clase IgG frente a Echinococcus granulosus mediante una prueba de enzimoinmunoanálisis indirecto de fabricación propia. RESULTADOS. Se detectaron anticuerpos de clase IgG frente a Echinococcus granulosus en el 3,40 por ciento de los sueros estudiados (164 positivos de 4.824), oscilando entre el 1,26 y el 7,10 por ciento según la provincia de origen. La seroprevalencia de anticuerpos aumentaba significativamente con la edad. No se observaron diferencias estadísticamente significativas entre las seroprevalencias halladas en mujeres y en varones (3,14 por ciento frente a 3,66 por ciento). CONCLUSIÓN. La seroprevalencia de infección por E. granulosus en la Comunidad Autónoma de Castilla y León es todavía alta. Estos datos de seroprevalencia contribuyen a la vigilancia de la hidatidosis dentro de un programa control de esta enfermedad (AU)

Serologic evidence of human infection by Francisella tularensis in the population of Castilla y León (Spain) prior to 1997.

Prior to an outbreak in Castilla y León in December 1997, tularaemia was practically non-existent in Spain. In this paper we studied the prevalence of antibodies against Francisella tularensis in a representative sample of the population (4825 people) from Castilla y León (Spain) in samples collected before this outbreak. Antibodies against F. tularensis were detected in nine (0.19%) of the 4825 sera, with antibody titres ranging from 1/20 to 1/160. Of these nine sera, one was positive in seroagglutination against Brucella. Seroagglutination against other bacteria (Yersinia enterocolitica O:9 and O:3 and Proteus OX19) was negative in all sera. Seroprevalence of antibodies in females was 0.20% and 0.17% in males; no statistically significant differences were found in prevalence in terms of sex, age or province.

[Prevalence of antibodies against Francisella tularensis in Castilla y León (Spain) before 1997]. / Prevalencia de anticuerpos frente a Francisella tularensis en la población de Castilla y León con anterioridad a 1997.

BACKGROUND AND OBJECTIVES: The aim of this paper was determine the prevalence of antibodies against Francisella tularensis in the representative sample of people from Castilla-León (Spain) before epidemic outbreak of end 1997. SUBJECTS AND METHOD: We obtain 4,825 sera (between april-1996 and april-1997) of people from Castilla-León. All sera were tested by a microagglutination technique to detect antibodies against Francisella tularensis. The positive sera were tested to determine cross-reaction with Brucella, Yersinia enterocolitica and Proteus in the tube agglutination tests. RESULTS: We detected antibodies against Francisella tularensis in 9 (0,19%) of the 4,825 sera. Only one serum from the 9 seropositive was positive in the tube agglutination against Brucella. None of the 9 sera were positive against the remaining bacterial antigen tested. CONCLUSIONS: In the people of Castilla-León before 1997 the prevalence of antibodies against Francisella tularensis was 0,19%.

Prevalencia de anticuerpos frente a Francisella tularensis en la población de Castilla y León con anterioridad a 1997 / Prevalence of antibodies against Francisella tularensis in Castilla y León (Spain) before 1997

FUNDAMENTO Y OBJETIVOS: Este trabajo pretende conocer la prevalencia de infección por Francisella tularensis en la población de Castilla y León previa al brote de tularemia humana de finales de 1997. SUJETOS Y MÉTODO: Se obtuvieron 4.825 sueros (entre abril de 1996 y abril de 1997) de residentes en Castilla y León. Se realizó una prueba de microaglutinación en placa para detectar anticuerpos anti-F. tularensis. En los sueros positivos se llevaron a cabo seroaglutinaciones en tubo frente a Brucella, Yersinia enterocolitica y Proteus. RESULTADOS: Se detectaron anticuerpos anti-F.tularensis en 9 (0,19 per cent) de los 4.825 sueros. De esos 9 sueros, uno fue positivo en la seroaglutinación frente a Brucella, siendo todos negativos frente a las otras bacterias. CONCLUSIONES: Antes de 1997 la seroprevalencia de anticuerpos anti-F. tularensis en la población de Castilla y León era baja (0,19 per cent) (AU)