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1.
J Appl Psychol ; 105(12): 1382-1396, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33090858

RESUMO

The authors assess levels and within-person changes in psychological well-being (i.e., depressive symptoms and life satisfaction) from before to during the COVID-19 pandemic for individuals in the United States, in general and by socioeconomic status (SES). The data is from 2 surveys of 1,143 adults from RAND Corporation's nationally representative American Life Panel, the first administered between April-June, 2019 and the second during the initial peak of the pandemic in the United States in April, 2020. Depressive symptoms during the pandemic were higher than population norms before the pandemic. Depressive symptoms increased from before to during COVID-19 and life satisfaction decreased. Individuals with higher education experienced a greater increase in depressive symptoms and a greater decrease in life satisfaction from before to during COVID-19 in comparison to those with lower education. Supplemental analysis illustrates that income had a curvilinear relationship with changes in well-being, such that individuals at the highest levels of income experienced a greater decrease in life satisfaction from before to during COVID-19 than individuals with lower levels of income. We draw on conservation of resources theory and the theory of fundamental social causes to examine four key mechanisms (perceived financial resources, perceived control, interpersonal resources, and COVID-19-related knowledge/news consumption) underlying the relationship between SES and well-being during COVID-19. These resources explained changes in well-being for the sample as a whole but did not provide insight into why individuals of higher education experienced a greater decline in well-being from before to during COVID-19. (PsycInfo Database Record (c) 2020 APA, all rights reserved).


Assuntos
COVID-19/psicologia , Transtorno Depressivo/psicologia , Inquéritos Epidemiológicos/estatística & dados numéricos , Satisfação Pessoal , Classe Social , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Escolaridade , Feminino , Inquéritos Epidemiológicos/métodos , Humanos , Masculino , Pessoa de Meia-Idade , Pandemias , Estados Unidos
2.
J Homosex ; 67(11): 1587-1602, 2020 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-31006354

RESUMO

Scholars have recently started to examine how minority stressors are associated with wellbeing outcomes among lesbian, gay, and bisexual (LGB) people. Such studies have examined mainly hedonic wellbeing, and those that have investigated eudaimonic wellbeing have tended to use composite measures. The present study draws from this literature to examine how minority stressors are associated with a key indicator of eudaimonic wellbeing: life meaning. Drawing from the minority stress model, we examined these associations using structural equation modeling among 266 LGB adults. Expectations of rejection and identity concealment, but not discrimination or internalized homophobia, had significant negative associations with life meaning. Discrimination had negative indirect associations with life meaning via expectations of rejection and concealment. Our results highlight the nuanced relations that exist between minority stressors and life meaning and highlight the need to move beyond composite measures of wellbeing. Implications for clinical practice and directions for research are discussed.


Assuntos
Felicidade , Minorias Sexuais e de Gênero/psicologia , Estresse Psicológico , Adolescente , Adulto , Bissexualidade , Mecanismos de Defesa , Feminino , Homofobia , Homossexualidade Feminina , Humanos , Masculino , Pessoa de Meia-Idade , Grupos Minoritários/psicologia , Adulto Jovem
3.
J Couns Psychol ; 66(2): 195-209, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30714744

RESUMO

The psychology of working theory (PWT; Duffy, Blustein, Diemer, & Autin, 2016) provides a framework to understand predictors and outcomes of decent work. Given that basic need satisfaction is hypothesized to be a primary mediator in the link between decent work and well-being, it is essential to have valid and reliable scales that are consistent with the PWT framework. In the current study, we developed the Work Needs Satisfaction Scales, a set of instruments designed to measure satisfaction of survival, social contribution, and self-determination needs from a PWT perspective. In Study 1 (N = 345), a pool of items was developed and exploratory factor analysis was conducted, resulting in five 4-item scales representing survival need satisfaction, social contribution need satisfaction, and three components of self-determination need satisfaction (i.e., autonomy, competence, relatedness). In Study 2 (N = 476), we used confirmatory factor analysis to test 4 different structural models, finding that there were no significant differences between models. Thus, results offer a flexible 5-factor model, the structure of which may be adapted based on theory and researcher needs. Authors provide theory-driven recommendations on how to best use choice of structural models for PWT research. Finally, we demonstrated convergent, discriminant, and concurrent validity for the structural model most consistent with the PWT. Implications for research and practice are discussed. (PsycINFO Database Record (c) 2019 APA, all rights reserved).


Assuntos
Satisfação no Emprego , Inquéritos e Questionários/normas , Local de Trabalho/psicologia , Adulto , Análise Fatorial , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Satisfação Pessoal , Reprodutibilidade dos Testes , Adulto Jovem
4.
J Couns Psychol ; 66(3): 328-340, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30589281

RESUMO

Over the past decade, research on work as a calling has seen a rapid growth, with hundreds of empirical articles on the topic having been published. Until recently, however, there has been no comprehensive theoretical model of work as a calling to guide research. Duffy, Dik, Douglass, England, and Velez (2018) published the Work as Calling Theory (WCT), which provides a comprehensive model of the predictors and outcomes of living out a calling. The present study provides the first empirical examination of the 20 propositions outlined within the predictor portion of this model. Using data collected from a sample of 424 employed adults living in the United States, from diverse social class backgrounds and occupations, we conducted latent variable structural equation modeling to evaluate the model propositions. Overall, we found full (17) and partial (1) support for 18 of the 20 model propositions, which included direct effects along with mediating and moderating effects. Person-environment fit, career commitment, and work meaning appear to be critical in helping to translate a perceived calling and access to opportunity into a lived calling. Additionally, calling motivation, organizational support, and job crafting may play a key role in helping employees with a calling experience more fit with their work environments. Taking these findings into consideration, we explore practical implications for career counselors and employers and highlight future directions for scholars using the WCT. (PsycINFO Database Record (c) 2019 APA, all rights reserved).


Assuntos
Emprego/psicologia , Satisfação no Emprego , Adulto , Feminino , Humanos , Masculino , Motivação , Ocupações , Estados Unidos , Local de Trabalho/psicologia
5.
J Homosex ; 66(2): 238-259, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-29072528

RESUMO

The present study examined the link between discrimination and the three components of subjective wellbeing (positive and negative affect and life satisfaction) among a cisgender sample of lesbian, gay, and bisexual (LGB) adults. Specifically, we investigated internalized homonegativity and expectations of rejection as potential mediators of the links between discrimination and subjective wellbeing among a sample of 215 participants. Results from our structural equation model demonstrated a strong, positive direct link between discrimination and negative affect. Discrimination also had small, negative indirect effects on life satisfaction through our two mediators. Interestingly, neither discrimination nor our two mediators were related with positive affect, demonstrating the need for future research to uncover potential buffers of this link. Finally, our model evidenced configural, metric, and scalar invariance, suggesting that our model applies well for both women and men. Practical implications and future directions for research are discussed.


Assuntos
Bissexualidade/psicologia , Minorias Sexuais e de Gênero/psicologia , Discriminação Social , Estresse Psicológico , Adulto , Mecanismos de Defesa , Feminino , Identidade de Gênero , Humanos , Masculino , Fatores Sexuais , Comportamento Sexual , Adulto Jovem
6.
J Couns Psychol ; 65(4): 423-439, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29999369

RESUMO

Perceiving work as a calling has been positioned as a key pathway to enhancing work-related well-being. However, no formal theory exists attempting to explain predictors and outcomes of living a calling at work. To address this important gap, this article introduces a theoretical, empirically testable model of work as a calling - the Work as Calling Theory (WCT) - that is suitable for the contemporary world of work. Drawing from research and theory in counseling, vocational, multicultural, and industrial-organizational psychology, as well as dozens of quantitative and qualitative studies on calling, the WCT is presented in three parts: (a) predictors of living a calling, (b) variables that moderate and mediate the relation of perceiving a calling to living a calling, and (c) positive (job satisfaction, job performance) and potentially negative (burnout, workaholism, exploitation) outcomes that result from living a calling. Finally, practical implications are suggested for counselors and managers, who respectively may seek to help clients and employees live a calling. (PsycINFO Database Record


Assuntos
Escolha da Profissão , Satisfação no Emprego , Modelos Teóricos , Apoio Social , Desempenho Profissional , Esgotamento Profissional/epidemiologia , Esgotamento Profissional/psicologia , Humanos
7.
J Couns Psychol ; 65(3): 280-293, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29672079

RESUMO

The present study tested key tenets of the Psychology of Working Theory (PWT) in a sample of 526 racially and ethnically diverse employed adults. The authors investigated how economic resources and marginalization predicted decent work through experiences of work volition and career adaptability. Support for the hypotheses was mixed. There was a direct, negative relation between marginalization and decent work; a direct, positive relation between economic resources and work volition; and a direct, negative relation between marginalization and work volition. There was a positive relation between work volition and career adaptability as well as with decent work. Work volition was also found to significantly mediate the relations between marginalization and economic resources to decent work. These results suggest that the primary reason why greater economic resources and lower experiences of marginalization predict engaging in decent work is attributable to an increased sense of choice in one's career decision making. Results suggest the need for further investigation using the PWT to understand how racially and ethnically diverse employed adults secure decent work. Practical implications are discussed. (PsycINFO Database Record


Assuntos
Diversidade Cultural , Status Econômico , Emprego/psicologia , Etnicidade/psicologia , Teoria Psicológica , Grupos Raciais/psicologia , Adulto , Escolha da Profissão , Estudos Transversais , Status Econômico/tendências , Emprego/economia , Emprego/tendências , Feminino , Humanos , Masculino , Grupos Raciais/etnologia , Marginalização Social/psicologia , Percepção Social , Volição
8.
J Couns Psychol ; 64(5): 550-559, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28333474

RESUMO

Research has found heterosexist discrimination negatively relates to vocational outcomes among lesbian, gay, and bisexual (LGB) people, but no known study has examined how heterosexist discrimination relates to the attainment of decent work. Building from the Psychology of Working Theory, which proposes that specific forms of marginalization coupled with economic constraints limit a person's ability to secure decent work, the present study examined theoretically hypothesized pathways to decent work among a sample of employed sexual minority adults. Heterosexist discrimination and social class were examined as direct predictors of decent work, and indirect links were examined via work volition and career adaptability. Among our sample of 218 sexual minority people, structural equation modeling results suggested heterosexist discrimination and social class directly-and indirectly through work volition-predicted decent work. Practical implications and directions for future research are discussed. (PsycINFO Database Record


Assuntos
Emprego/psicologia , Preconceito/psicologia , Minorias Sexuais e de Gênero/psicologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Modelos Psicológicos , Adulto Jovem
9.
J Couns Psychol ; 64(2): 206-221, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28165257

RESUMO

Decent work is positioned as the centerpiece of the recently developed Psychology of Working Theory (PWT; Duffy, Blustein, Diemer, & Autin, 2016). However, to date, no instrument exists which assesses all 5 components of decent work from a psychological perspective. In the current study, we developed the Decent Work Scale (DWS) and demonstrated several aspects of validity with 2 samples of working adults. In Study 1 (N = 275), a large pool of items were developed and exploratory factor analysis was conducted resulting in a final 15-item scale with 5 factors/subscales corresponding to the 5 components of decent work: (a) physically and interpersonally safe working conditions, (b) access to health care, (c) adequate compensation, (d) hours that allow for free time and rest, and (e) organizational values that complement family and social values. In Study 2 (N = 589), confirmatory factor analysis demonstrated that a 5-factor, bifactor model offered the strongest and most parsimonious fit to the data. Configural, metric, and scalar invariance models were tested demonstrating that the structure of the instrument did not differ across gender, income, social class, and majority/minority racial/ethnic groups. Finally, the overall scale score and 5 subscale scores correlated in the expected directions with similar constructs supporting convergent and discriminant evidence of validity, and subscale scores evidenced predictive validity in the prediction of job satisfaction, work meaning, and withdrawal intentions. The development of this scale provides a useful tool for researchers and practitioners seeking to assess the attainment of decent work among employed adults. (PsycINFO Database Record


Assuntos
Escolha da Profissão , Mobilidade Ocupacional , Satisfação no Emprego , Psicometria/estatística & dados numéricos , Inquéritos e Questionários , Carga de Trabalho/psicologia , Local de Trabalho , Adulto , Feminino , Acessibilidade aos Serviços de Saúde , Humanos , Renda , Relações Interpessoais , Masculino , Pessoa de Meia-Idade , Saúde Ocupacional , Teoria Psicológica , Estados Unidos
10.
J Couns Psychol ; 64(1): 1-11, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27929299

RESUMO

Research has found perceived discrimination to be a risk factor for mental health concerns among lesbian, gay, and bisexual (LGB) people, but less clarity exists linking perceived discrimination with well-being outcomes. Building from Meyer's (2003) minority stress model, the present study examined the links between perceived discrimination and the 3 components of subjective well-being: positive affect, negative affect, and life satisfaction. Self-esteem and stigma consciousness were explored as empirically and theoretically implied moderators. In a sample of 368 LGB people, structural equation modeling results suggested that discrimination was not significantly associated with positive affect or life satisfaction but had a significant positive relation with negative affect. Self-esteem moderated the associations between discrimination and positive and negative affect, and stigma consciousness moderated the link with negative affect. Practical implications and directions for future research are discussed. (PsycINFO Database Record


Assuntos
Bissexualidade/psicologia , Preconceito/psicologia , Minorias Sexuais e de Gênero/psicologia , Adulto , Feminino , Humanos , Masculino , Saúde Mental , Qualidade de Vida/psicologia , Autoimagem , Comportamento Sexual/psicologia , Estigma Social
11.
Ecol Evol ; 7(24): 11113-11123, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-29299286

RESUMO

Small-mammal population densities can be regulated by bottom-up (food availability) and top-down (predation) forces. In 1993, an El Niño Southern Oscillation event was followed by a cluster of human hantavirus with pulmonary syndrome in the southwestern United States. An upward trophic cascade hypothesis was proposed as an explanation for the outbreak: Increased plant productivity as a consequence of El Niño precipitations led to an unusual increase in distribution and abundance of deer mice (Peromyscus maniculatus; reservoir host of Sin Nombre virus). Could such drastic events occur in mesic habitats, where plant productivity in response to climate conditions is likely to be much less dramatic? In this work, we investigate to what extent deer mouse populations follow a precipitation-driven, bottom-up model in central and western Montana and discuss important conditions for such a model to be possible. We found positive correlations between deer mouse abundance and on-the-ground measured plant productivity with a several-month lag in three of six study sites. This effect was weaker when deer mouse populations were more abundant, indicating density-dependent effects. Dispersal resulting from territoriality may be important in attenuating local density increments in spite of high food availability. In addition, there is evidence that population abundance in the study area could respond to other abiotic factors. In particular, precipitation in the form of snow may reduce deer mice survival, thus compensating the benefits of improved plant productivity. Deer mouse populations in Montana study sites follow complex dynamics determined by multiple limiting factors, leading to a damped precipitation-driven bottom-up regulation. This prevents dramatic changes in rodent abundances after sudden increments of food availability, such as those observed in other regions.

12.
Ecosphere ; 7(6)2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-27398256

RESUMO

We use data collected on 18,1-ha live trapping grids monitored from 1994 through 2005 and on five of those grids through 2013 in the mesic northwestern US to illustrate the complexity of the deer mouse (Peromyscus maniculatus)/Sin Nombre virus (SNV) host-pathogen system. Important factors necessary to understand zoonotic disease ecology include those associated with distribution and population dynamics of reservoir species as well as infection dynamics. Results are based on more than 851,000 trap nights, 16,608 individual deer mice and 10,572 collected blood samples. Deer mice were distributed throughout every habitat we sampled and were present during every sampling period in all habitats except high altitude habitats over1900 m. Abundance varied greatly among locations with peak numbers occurring mostly during fall. However, peak rodent abundance occurred during fall, winter and spring during various years on three grids trapped 12 mo/yr. Prevalence of antibodies to SNV averaged 3.9% to 22.1% but no grids had mice with antibodies during every month. The maximum period without antibody-positive mice ranged from one month to 52 months, or even more at high altitude grids where deer mice were not always present. Months without antibody-positive mice were more prevalent during fall than spring. Population fluctuations were not synchronous over broad geographic areas and antibody prevalences were not well spatially consistent, differing greatly over short distances. We observed an apparently negative, but non-statistically significant relationship between average antibody prevalence and average deer mouse population abundance and a statistically significant positive relationship between the average number of antibody positive mice and average population abundance. We present data from which potential researchers can estimate the effort required to adequately describe the ecology of a rodent-borne viral system. We address different factors affecting population dynamics and hantavirus antibody prevalence and discuss the path to understanding a complex rodent-borne disease system as well as the obstacles in that path.

13.
Bioscience ; 65(7): 651-666, 2015 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-26955081

RESUMO

Understanding the environmental drivers of zoonotic reservoir and human interactions is crucial to understanding disease risk, but these drivers are poorly predicted. We propose a mechanistic understanding of human-reservoir interactions, using hantavirus pulmonary syndrome as a case study. Crucial processes underpinning the disease's incidence remain poorly studied, including the connectivity among natural and peridomestic deer mouse host activity, virus transmission, and human exposure. We found that disease cases were greatest in arid states and declined exponentially with increasing precipitation. Within arid environments, relatively rare climatic conditions (e.g., El Niño) are associated with increased rainfall and reservoir abundance, producing more frequent virus transmission and host dispersal. We suggest that deer mice increase their occupancy of peridomestic structures during spring-summer, amplifying intraspecific transmission and human infection risk. Disease incidence in arid states may increase with predicted climatic changes. Mechanistic approaches incorporating reservoir behavior, reservoir-human interactions, and pathogen spillover could enhance our understanding of global hantavirus ecology, with applications to other directly transmitted zoonoses.

14.
J Couns Psychol ; 61(4): 605-15, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25181588

RESUMO

The current study examined the link between living a calling and career commitment, work meaning, and job satisfaction with a diverse group of working adults at 3 time points over a 6-month period. Using structural equation modeling, 3 models were tested that hypothesized that living a calling would predict career commitment, work meaning, and job satisfaction over time. However, counter to hypotheses, living a calling was best positioned as an outcome of each of these variables. Specifically, living a calling at Time 2 and Time 3 was significantly predicted by career commitment, work meaning, and job satisfaction at Time 1 and Time 2, respectively. Time 2 living a calling did predict Time 3 work career commitment and work meaning, but these effects were small. Results suggest that over time, individuals who feel committed to their career, derive more meaning from their work, and are more satisfied with their jobs are more likely to feel they are living a calling. Practical implications are discussed.


Assuntos
Escolha da Profissão , Satisfação no Emprego , Qualidade de Vida/psicologia , Identificação Social , Adolescente , Adulto , Idoso , Feminino , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Adulto Jovem
15.
Ecohealth ; 10(2): 159-65, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23532351

RESUMO

The most common mechanism for human exposure to hantaviruses throughout North America is inhalation of virally contaminated particulates. However, risk factors associated with exposure to particulates potentially contaminated with hantaviruses are generally not well understood. In North America, Sin Nombre virus (SNV) is the most common hantavirus that infects humans, causing hantavirus pulmonary syndrome, which has a significant mortality rate (approximately 35%). We investigated human exposure to particulate matter and evaluated the effects of season, location (sylvan and peridomestic environment), and activity (walking and sweeping) on generation of particulates at the breathing zone (1.5 m above the ground). We found greater volumes of small inhalable particulates during the spring and summer compared to the fall and winter seasons and greater volumes of small inhalable particulates produced in peridomestic, compared to sylvan, environments. Also, greater volumes of particulates were generated at the breathing zone while walking compared to sweeping. Results suggest that more aerosolized particles were generated during the spring and summer months. Our findings suggest that simply moving around in buildings is a significant source of human exposure to particulates, potentially contaminated with SNV, during spring and summer seasons. These findings could be advanced by investigation of what particle sizes SNV is most likely to attach to, and where in the respiratory tract humans become infected.


Assuntos
Síndrome Pulmonar por Hantavirus/transmissão , Exposição por Inalação/efeitos adversos , Material Particulado/efeitos adversos , Vírus Sin Nombre/isolamento & purificação , Zoonoses , Animais , Reservatórios de Doenças/virologia , Meio Ambiente , Fezes/virologia , Síndrome Pulmonar por Hantavirus/virologia , Humanos , Exposição por Inalação/análise , Camundongos , Montana , Material Particulado/análise , Peromyscus/virologia , Doenças dos Roedores/transmissão , Doenças dos Roedores/virologia , Estações do Ano , Vírus Sin Nombre/patogenicidade , Zoonoses/transmissão , Zoonoses/virologia
16.
PLoS One ; 7(10): e47731, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23110096

RESUMO

Sin Nombre hantavirus (SNV), hosted by the North American deermouse (Peromyscus maniculatus), causes hantavirus pulmonary syndrome (HPS) in North America. Most transmission studies in the host were conducted under artificial conditions, or extrapolated information from mark-recapture data. Previous studies using experimentally infected deermice were unable to demonstrate SNV transmission. We explored SNV transmission in outdoor enclosures using naturally infected deermice. Deermice acquiring SNV in enclosures had detectable viral RNA in blood throughout the acute phase of infection and acquired significantly more new wounds (indicating aggressive encounters) than uninfected deermice. Naturally-infected wild deermice had a highly variable antibody response to infection, and levels of viral RNA sustained in blood varied as much as 100-fold, even in individuals infected with identical strains of virus. Deermice that infected other susceptible individuals tended to have a higher viral RNA load than those that did not infect other deermice. Our study is a first step in exploring the transmission ecology of SNV infection in deermice and provides new knowledge about the factors contributing to the increase of the prevalence of a zoonotic pathogen in its reservoir host and to changes in the risk of HPS to human populations. The techniques pioneered in this study have implications for a wide range of zoonotic disease studies.


Assuntos
Síndrome Pulmonar por Hantavirus/veterinária , Peromyscus , Doenças dos Roedores/transmissão , Doenças dos Roedores/virologia , Vírus Sin Nombre/fisiologia , Zoonoses/transmissão , Animais , Anticorpos Antivirais/sangue , Primers do DNA/genética , Ensaio de Imunoadsorção Enzimática/veterinária , Síndrome Pulmonar por Hantavirus/transmissão , Humanos , Montana , RNA Viral/sangue , Reação em Cadeia da Polimerase em Tempo Real/veterinária , Reação em Cadeia da Polimerase Via Transcriptase Reversa/veterinária , Carga Viral
17.
PLoS One ; 7(6): e37254, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22768034

RESUMO

Surveys of wildlife host-pathogen systems often document clear seasonal variation in transmission; conclusions concerning the relationship between host population density and transmission vary. In the field, effects of seasonality and population density on natural disease cycles are challenging to measure independently, but laboratory experiments may poorly reflect what happens in nature. Outdoor manipulative experiments are an alternative that controls for some variables in a relatively natural environment. Using outdoor enclosures, we tested effects of North American deermouse (Peromyscus maniculatus) population density and season on transmission dynamics of Sin Nombre hantavirus. In early summer, mid-summer, late summer, and fall 2007-2008, predetermined numbers of infected and uninfected adult wild deermice were released into enclosures and trapped weekly or bi-weekly. We documented 18 transmission events and observed significant seasonal effects on transmission, wounding frequency, and host breeding condition. Apparent differences in transmission incidence or wounding frequency between high- and low-density treatments were not statistically significant. However, high host density was associated with a lower proportion of males with scrotal testes. Seasonality may have a stronger influence on disease transmission dynamics than host population density, and density effects cannot be considered independent of seasonality.


Assuntos
Síndrome Pulmonar por Hantavirus/veterinária , Doenças dos Roedores/transmissão , Doenças dos Roedores/virologia , Estações do Ano , Vírus Sin Nombre/fisiologia , Animais , Síndrome Pulmonar por Hantavirus/epidemiologia , Síndrome Pulmonar por Hantavirus/transmissão , Síndrome Pulmonar por Hantavirus/virologia , Incidência , Masculino , América do Norte/epidemiologia , Peromyscus/virologia , Densidade Demográfica , Reprodução , Doenças dos Roedores/epidemiologia , Testículo/patologia , Aumento de Peso
18.
Rev Chilena Infectol ; 29(2): 200-6, 2012 Apr.
Artigo em Espanhol | MEDLINE | ID: mdl-22689036

RESUMO

Oligoryzomys longicaudatus is the main reservoir of Andes virus (AND), which causes hantavirus pulmonary syndrome in Patagonia. The factors associated with the presence of antibodies against AND in this species are unknown. This study used a logistic regression model to analyze which characteristics of O. longicaudatus, captured in northern Argentinean Patagonia, led to an increased probability of an animal having antibodies against AND and to relate these characteristics to possible mechanisms of transmission of the virus within the population. Sex, age, body mass, and wounds were important predictors regarding the presence of antibodies against AND within O. longicaudatus populations. The probability of a wounded male O. longicaudatus adult having AND antibodies increased in parallel with the body mass. The probability of having antibodies was more than 80% in individuals with body masses above 44 gram. However, the possible transmission mechanism of AND within O. longicaudatus population is still uncertain and further studies involving a larger number of individuals and prolonged monitoring including the process of seroconversion are needed.


Assuntos
Anticorpos Antivirais/sangue , Reservatórios de Doenças/veterinária , Infecções por Hantavirus/veterinária , Orthohantavírus/imunologia , Doenças dos Roedores/virologia , Sigmodontinae/virologia , Animais , Argentina , Índice de Massa Corporal , Reservatórios de Doenças/virologia , Feminino , Infecções por Hantavirus/imunologia , Modelos Logísticos , Masculino , Estudos Retrospectivos , Doenças dos Roedores/imunologia , Estações do Ano , Estudos Soroepidemiológicos
19.
J Wildl Dis ; 48(2): 348-60, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22493110

RESUMO

Deer mice (Peromyscus maniculatus) are the main reservoir host for Sin Nombre virus, the primary etiologic agent of hantavirus pulmonary syndrome in North America. Sequential changes in weather and plant productivity (trophic cascades) have been noted as likely catalysts of deer mouse population irruptions, and monitoring and modeling of these phenomena may allow for development of early-warning systems for disease risk. Relationships among weather variables, satellite-derived vegetation productivity, and deer mouse populations were examined for a grassland site east of the Continental Divide and a sage-steppe site west of the Continental Divide in Montana, USA. We acquired monthly deer mouse population data for mid-1994 through 2007 from long-term study sites maintained for monitoring changes in hantavirus reservoir populations, and we compared these with monthly bioclimatology data from the same period and gross primary productivity data from the Moderate Resolution Imaging Spectroradiometer sensor for 2000-06. We used the Random Forests statistical learning technique to fit a series of predictive models based on temperature, precipitation, and vegetation productivity variables. Although we attempted several iterations of models, including incorporating lag effects and classifying rodent density by seasonal thresholds, our results showed no ability to predict rodent populations using vegetation productivity or weather data. We concluded that trophic cascade connections to rodent population levels may be weaker than originally supposed, may be specific to only certain climatic regions, or may not be detectable using remotely sensed vegetation productivity measures, although weather patterns and vegetation dynamics were positively correlated.


Assuntos
Reservatórios de Doenças/veterinária , Peromyscus , Plantas , Tempo (Meteorologia) , Animais , Reservatórios de Doenças/virologia , Feminino , Masculino , Modelos Biológicos , Montana , Peromyscus/crescimento & desenvolvimento , Peromyscus/virologia , Densidade Demográfica , Dinâmica Populacional , Crescimento Demográfico , Vigilância da População , Valor Preditivo dos Testes , Comunicações Via Satélite , Estações do Ano , Vírus Sin Nombre/crescimento & desenvolvimento , Vírus Sin Nombre/patogenicidade , Árvores
20.
Rev. chil. infectol ; 29(2): 200-206, abr. 2012. ilus, graf, tab
Artigo em Espanhol | LILACS | ID: lil-627234

RESUMO

Oligoryzomys longicaudatus is the main reservoir of Andes virus (AND), which causes hantavirus pulmonary syndrome in Patagonia. The factors associated with the presence of antibodies against AND in this species are unknown. This study used a logistic regression model to analyze which characteristics of O. longicaudatus, captured in northern Argentinean Patagonia, led to an increased probability of an animal having antibodies against AND and to relate these characteristics to possible mechanisms of transmission of the virus within the population. Sex, age, body mass, and wounds were important predictors regarding the presence of antibodies against AND within O. longicaudatus populations. The probability of a wounded male O. longicaudatus adult having AND antibodies increased in parallel with the body mass. The probability of having antibodies was more than 80% in individuals with body masses above 44 gram. However, the possible transmission mechanism of AND within O. longicaudatus population is still uncertain and further studies involving a larger number of individuals and prolonged monitoring including the process of seroconversion are needed.


Oligoryzomys longicaudatus es el principal reservorio del virus Andes Sur (AND) causante del síndrome pulmonar por hantavirus en la Patagonia. Aún se desconoce qué características individuales están asociadas a una mayor presencia de anticuerpos contra AND en esta especie. En este estudio, mediante un modelo de regresión logística evaluamos qué características de O. longicaudatus, capturados en la Patagonia norte de Argentina, incrementan la probabilidad de un individuo de presentar anticuerpos contra AND para relacionarlos con posibles mecanismos de transmisión del virus dentro de la población. El sexo, la edad, la masa corporal y las heridas resultaron factores importantes para la circulación y persistencia del virus dentro de la población de O. longicaudatus. La probabilidad de que un O. longicaudatus, macho, adulto con heridas presente anticuerpos contra AND aumentó con el incremento de la masa corporal, siendo esta probabilidad mayor al 80% en individuos con masas corporales mayores a 44 g. Sin embargo, el posible mecanismo de transmisión de AND dentro de la población de O. longicaudatus queda aún incierto, por lo que son necesarios estudios futuros que involucren un mayor número de individuos y un tiempo prolongado de seguimiento en su proceso de seroconversión.


Assuntos
Animais , Feminino , Masculino , Anticorpos Antivirais/sangue , Reservatórios de Doenças/veterinária , Infecções por Hantavirus/veterinária , Orthohantavírus/imunologia , Doenças dos Roedores/virologia , Sigmodontinae/virologia , Argentina , Índice de Massa Corporal , Reservatórios de Doenças/virologia , Infecções por Hantavirus/imunologia , Modelos Logísticos , Estudos Retrospectivos , Doenças dos Roedores/imunologia , Estações do Ano , Estudos Soroepidemiológicos
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