Aging and Mental Health: Collaborating on Research Priorities with Older Adults, Caregivers and Health and Social Care Providers across Canada.

Age-related changes can affect mental health, but aging-focused mental health research is limited. The objective was to identify the top 10 unanswered research questions on aging and mental health according to what matters most to aging Canadians. A steering group of experts-by-experience (e.g., older adults, caregivers, health and social care providers) guided three phases of a modified James Lind Alliance priority-setting partnership: (1) a broad national survey (n = 305) and a rapid literature scan; (2) a follow-up national survey (n = 703); and (3) four online workshops (n = 52) with a nominal group technique. Forty-two unique questions on aging and mental health resulted, of which 18 were determined to be answered by existing evidence. Of the 25 partially and unanswered questions, 10 were ranked as top priority. Findings can be used to prioritize future research, knowledge mobilization, and funding decisions, and to promote and support collaboration between longstanding siloed research and care fields.

Co-designing action-oriented mental health conversations between care providers and ageing Canadians in the community: a participatory mixed-methods study protocol.

INTRODUCTION: The mental health of ageing Canadians is a growing concern, particularly post-pandemic. Older adults face systemic ageism and mental health stigma as pervasive barriers to seeking needed mental health support, care and treatment within health and social care systems. These barriers are exacerbated when service providers focus on physical healthcare needs or lack the skills and confidence to talk about and/or address mental health during routine visits. This study aims to co-design and test an evidence-based approach to mental health conversations at the point-of-care in home and community settings with older adults, family and friend caregivers and health and social care providers that could facilitate help-seeking activities and care access. METHODS AND ANALYSIS: A participatory mixed-methods study design will be applied, guided by a Working Group of experts-by-experience (n=30). Phase 1 engages ageing Canadians in four online workshops (n=60) and a national survey (n=1000) to adapt an evidence-based visual model of mental health for use with older adults in home and community care. Phase 2 includes six co-design workshops with community providers (n=90) in rural and urban sites across three Canadian provinces to co-design tools, resources and processes for enabling the use of the adapted model as a conversation guide. Phase 3 involves pilot and feasibility testing the co-designed conversations with older adult clients of providers from Phase 2 (n=180). ETHICS AND DISSEMINATION: Phases 1 and 2 of this study have received ethics clearance at the University of Waterloo (ORE #44187), University of British Columbia (#H22-02306) and St. Francis Xavier University (#26075). While an overview of Phase 3 is included, details will rely on Phase 2 outcomes. Knowledge mobilisation activities will include peer-reviewed publications, conference presentations, webinars, newsletters, infographics and policy briefs. Interested audiences may include community organisations, policy and decision-makers and health and social care providers.

Technology to support aging in place: key messages for policymakers and funders.

AgeTech, a subset of the health technology industry, uses technology to support healthy aging, and support care partners and health professionals to improve quality of life for aging adults. By enhancing and adapting alternative care approaches through emerging technologies, it is possible to enable and extend the ability for older adults to safely age in place within their own homes, improve care experiences, and/or decrease long-term care costs/needs. With the rapid development and proliferation of AgeTech into the consumer market, it is paramount for policymakers and funders to ensure that AgeTech solutions can be leveraged to support older adults to age well in place. This paper highlights five key messages for policymakers and funders drawing on experiences from Canada. First, it is essential to embrace a life course perspective on aging, recognizing the heterogeneity of older adults who experience diverse and evolving needs. AgeTech should adapt as needs and capacities evolve. Second, AgeTech should solve a real problem. Technology must be well aligned to the needs and preferences of older adults to be impactful. Third, health related AgeTech should empower, enhance, or support existing health care services, while recognizing the value of human interactions. In-person interactions can provide meaningful connection and important health data which should be enhanced not replaced. Fourth, the establishment and ongoing fostering of authentic partnerships to inform, co-create and co-design AgeTech solutions is key to developing successful products. Finally, policymakers and funders have an important role to play in enabling accelerated design, development and testing to meet current and future needs.

Experiential Value of Technologies: A Qualitative Study with Older Adults.

This study investigated the experiences of older adults with technologies they own and determined how they value them. Thirty-seven older adults participated in a Show and Tell co-creation session at a one-day workshop. Participants described why they loved or abandoned technologies they own. Their responses were recorded and analysed using Atlas.ti 22.0.0. Seven main themes representing experiential value in older adults emerged from the analysis: Convenience, Economy, Learning and Support, Currency of Technology, Privacy and Security, Emotions and Identity aspects of their experiences. This qualitative study has resulted in implications to design that recommends (a) Design for product ecosystems with technologies and services well-coordinated and synchronized to facilitate use of the technology (b) Create awareness and information on privacy and security issues and technical language associated with it (c) Make anti-virus and anti-phishing software accessible to older population (d) Design technologies as tools that allow older adults to identify themselves in the community and family (e) Create services that make technologies and services in the ecosystem affordable for the older adults. The outcomes of this study are significant as they provide recommendations that target systemic issues which present barriers in the use of technology.

Engagement of older adults in regional health innovation: The ECOTECH concept mapping project.

OBJECTIVES: Regional health innovation ecosystems can activate collaboration and support planning, self-management and development and commercialization of innovations. We sought to understand how older adults and their caregivers can be meaningfully engaged in regional health innovation ecosystems focused on health and aging-related technology innovation. METHODS: A six-phase concept mapping technique gathered data over six time points across Canada. Brainstorming conducted online and in person identified engagement ideas. Statements were sorted by similarity and rated by participants on importance and feasibility. Qualitative approaches and multidimensional scaling, hierarchical cluster analysis, descriptive statistics and t tests were used for analysis. RESULTS: Sixty-two unique ideas were assembled into a seven-cluster framework of priorities for engagement in regional health innovation ecosystems including public forums, co-production and partnerships, engagement, linkage and exchange, developing cultural capacity, advocacy and investment in the ecosystem. CONCLUSIONS: This study identified a framework of priorities for directions and strategies for older adult and caregiver engagement in regional health innovation ecosystems. Next steps include collaborations to develop regional health innovation ecosystems that actively engage older adults and their caregivers in health and aging-related technology innovation.

A SHARP Response: Developing COVID-19 Research Aims in Partnership with the Seniors Helping as Research Partners (SHARP) Group.

COVID-19 has disproportionally impacted older adults, and has highlighted many issues, including extreme deficiencies in Canadian long-term care homes and gaps in home and community care services for older adults. In recent years, there has been a push towards better patient and family engagement in health system research, and with the onset of the pandemic, engaging older adults in research and policy planning is more important than ever. In this article, we describe the Seniors Helping as Research Partners (SHARP) approach to engagement with older adults as an example of how partnerships that engage older adults in the development of research aims and processes can help to ensure that future research meets the needs of older adults. SHARP members highlighted a number of areas for future COVID-19 research such as improvements to long-term care, enhancing access to home and community care, and a focus on aging and social isolation.

Building a Rehabilitative Care Measurement Instrument to Improve the Patient Experience.

OBJECTIVE: To develop and test face and content validity, and user interface design of a rehabilitative care patient experience measure. DESIGN: Mixed methods, cross-sectional validation study that included subject matter expert input. Cognitive interviewing tested user interface and design. SETTING: Outpatient rehabilitative care settings. PARTICIPANTS: Subject matter experts (n=3), health care providers (n=137), and patients and caregivers (n=5) contributed to the question development. Convenience and snowball sampling were used to recruit rehabilitative care patients postdischarge (n=9) for cognitive interviews to optimize survey design and user interface (N=154). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: This novel survey instrument measures 6 concepts previously identified as key to outpatient rehabilitative care patients' experience: ecosystem issues, client and informal caregiver engagement, patient and health care provider relations, pain and functional status, group and individual identity, and open-ended feedback. RESULTS: 502 survey questions from psychometrically tested instruments, secondary data from a related ethnographic study, and consultations with health care providers, patients, caregivers, and subject matter experts, were analyzed to create a 10-item questionnaire representing 6 key constructs that influence patient experience quality. Cognitive interviewing with 9 patients (3 rounds of 3 participants each), produced 3 progressively edited versions of the survey instrument. A final version required no further modifications. DISCUSSION: Rehabilitative care clients have characteristics that differentiate their experience from that of other sectors and patient groups, warranting a distinct experience measure. The survey instrument includes a parsimonious set of questions that address strategic issues in the ongoing improvement of care delivery and the patient experience in the rehabilitative care sector. CONCLUSION: The rehabilitative care patient experience survey instrument developed has an acceptable user interface, and content and face validity. Psychometric testing of the survey instrument is reported elsewhere.

AGING AND HEALTH TECHNOLOGY ASSESSMENT: AN IDEA WHOSE TIME HAS COME.

OBJECTIVES: With the increase in technologies to support an aging population, health technology assessment (HTA) of aging-related technologies warrants special consideration. At Health Technology Assessment international (HTAi) 2016 and HTAi 2017, an international panel explored interests in HTA focused on aging. METHODS: Panelists from five countries shared the state of aging and HTA in their countries. Opportunities were provided for participants to discuss and rate the themes identified by the panelists. RESULTS: In 2016, the highest ranked themes were: (i) identifying unmet needs of older adults that could be met by technology-how can HTA help?; (ii) differences in assessment of aging-related technologies-what is the scope?; and (iii) involvement of older adults and caregivers. These themes became the starting point for discussion in 2017, for which the highest ranked themes were: (i) identification of challenges in HTA and aging; and (ii) approaches to advancing effectiveness of HTA for aging. CONCLUSION: These discussions allowed for examination of future directions for HTA and aging: engagement of older adults to inform the agenda of HTA and the broader public policy enterprise; a systems approach to thinking about needs of older persons should support the type and level of care desired by the individual rather than the health institutions, and HTA should reflect these desires when evaluating technological aides; and there is potential for health information systems and "big data" to support HTA activities that assess usability of technologies for older adults. We hope to build on the momentum of this community to continue exploring opportunities for aging and HTA.

Psychometric Testing of a Rehabilitative Care Patient Experience Instrument.

OBJECTIVE: To evaluate the internal consistency and test-retest reliability, construct validity, and feasibility of the WatLX, a measure of the experience of patients in rehabilitative care. DESIGN: Multisite, cross-sectional, and test-retest self-report study. SETTING: Outpatient rehabilitative care settings. PARTICIPANTS: The WatLX was administered to English-speaking, cognitively intact outpatients (N=1174) over 18 years old who had completed a program of cardiac, musculoskeletal, neurologic, stroke, pulmonary, or speech language rehabilitative care, at 2 separate time points: (1) immediately following completion of their rehabilitation program, and (2) 2 weeks later (n=29). A subsequent feasibility study was conducted with 1013 patients from 19 clinics. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: The WatLX measures 6 concepts, previously identified as key to outpatient rehabilitative care patients' experience: (1) ecosystem issues, (2) client and informal caregiver engagement, (3) patient and health care provider relations, (4) pain and functional status, (5) group and individual identity, and (6) open-ended feedback. RESULTS: Reliability analyses were conducted on 2 versions of the WatLX. Using a 7-point versus a 5-point Likert scale resulted in higher internal consistency and reliability scores. Cronbach's alpha coefficients were .863 and .957 for the 5- and 7-point scale, respectively, and the ICC scores were .827 and .880, respectively. The proof of concept study recruited 1013 patients with little interruption of workflow; results displayed strong internal consistency (Cronbach's alpha coefficient =.906). There is evidence of ceiling effects. CONCLUSIONS: The WatLX is a parsimonious question set that is feasible for administration in ambulatory rehabilitative care settings, and which shows promising psychometric properties.

Engaging Older Adults in Health Care Decision-Making: A Realist Synthesis.

BACKGROUND: Engagement in healthcare decision making has been recognized as an important, and often lacking, aspect of care, especially in the care of older adults who are major users of the healthcare system. OBJECTIVE: We aimed to conduct a review of available knowledge on engagement in healthcare decision making with a focus on older patients and their caregivers. METHODS: We conducted a realist synthesis focusing on strategies for engagement of older patients and their caregivers in healthcare decision making. The synthesis encompassed theoretical frameworks and both peer-reviewed and grey literature. Expert consultations included interviews (n = 2) with academics and group consultations (n = 3) with older adults and their caregivers. Abstracts that reported description, assessment, or evaluation of strategies for engagement of adult patients, families, or caregivers (i.e., that report on actual experiences of engagement) were included. RESULTS: The search generated 15,683 articles, 663 of which were pertinent to healthcare decision making. Theoretical and empirical work identified a range of strategies and levels of engagement of older patients and their families in healthcare decision making. The importance of communication emerged as a key recommendation for meaningful engagement among providers and patients and their caregivers. The principles developed in this study should be implemented with consideration of the context in which care is being provided. CONCLUSIONS: We have developed a framework that promotes the engagement of patients and their caregivers as equal partners in healthcare decision making. Future research should implement and test the framework in various clinical settings.

Engaging older adults in healthcare research and planning: a realist synthesis.

PLAIN ENGLISH SUMMARY: The importance of citizen involvement in healthcare research and planning has been widely recognized. There is however, a lack of understanding of how best to engage older adults, Canada's fastest growing segment of the population and biggest users of the healthcare system. We aimed to address this gap by developing an understanding of the engagement of older adults and their caregivers in healthcare research and planning. We conducted a review of available knowledge on engagement in healthcare research and planning with a focus on older adults and their caregivers. A five stage engagement framework emerged from this study that can be used to guide engagement efforts. We are continuing to collaborate with older adults and decision makers to develop and test strategies based on the presented framework. ABSTRACT: Background The importance of engaging the community in healthcare research and planning has been widely recognized. Currently however, there is a limited focus on older adults, Canada's fastest growing segment of the population and biggest users of the healthcare system. Objective This project aimed to develop an understanding of engagement of older adults and their caregivers in healthcare research and planning. Method A realist synthesis was conducted of the available knowledge on engagement in healthcare research and planning. The search methodology was informed by a framework for realist syntheses following five phases, including consultations with older adults. The synthesis included theoretical frameworks, and both peer-reviewed and grey literature. Results The search generated 15,683 articles, with 562 focusing on healthcare research and planning. The review lead to the development of a framework to engage older adults and their caregivers in healthcare research and planning. The 5 stages environment, plan, establish, build, and transition are accompanied with example context, mechanism, and outcomes to guide the use of this framework. Conclusion We have identified a framework that promotes meaningful engagement of older adults and their caregivers. We are continuing to collaborate with our community partners to further develop and evaluate engagement strategies that align with the presented framework.

Giving voice to older adults living with frailty and their family caregivers: engagement of older adults living with frailty in research, health care decision making, and in health policy.

PLAIN ENGLISH SUMMARY: The paper discusses engaging older adults living with frailty and their family caregivers. Frailty is a state that puts an individual at a higher risk for poor health outcomes and death. Understanding whether a person is frail is important because treatment and health care choices for someone living with frailty may be different from someone who is not (i.e., who is fit). In this review, we discuss strategies and hurdles for engaging older adults living with frailty across three settings: research, health and social care, and policy. We developed this review using published literature, expert opinion, and stakeholder input (including citizens). Engaging frail older individuals will be challenging because of their vulnerable health state - but it can be done. Points of consideration specific to engaging this vulnerable population include:In any setting, family caregivers (defined to include family, friends, and other social support systems) play an important role in engaging and empowering older adults living with frailtyEngagement opportunities need to be flexible (e.g., location, time, type)Incentivizing engagement for researchers and citizens (financial and otherwise) may be necessaryThe education and training of citizens, health and social care providers, and researchers on engagement practicesPatient-centered care approaches should consider the specific needs of individuals living with frailty including end-of-life care and advanced care planningInfluencing policy can occur in many ways including participating at institutional, regional, provincial or national committees that relate to health and social care. ABSTRACT: Older adults are the fastest growing segment of Canada's population resulting in an increased number of individuals living with frailty. Although aging and frailty are not synonymous the proportion of those who are frail increases with age. Frailty is not defined by a single condition, but rather a health state characterized by an increased risk of physical, mental, or social decline, deterioration of health status, and death. Recognizing frailty is important because earlier detection allows for program implementation focused on prevention and management to reduce future hospitalization, improve outcomes, and enhance vitality and quality of life. Even though older adults living with frailty are significant users of health care resources, their input is under-represented in research, health care decision making, and health policy formulation. As such, engaging older adults living with frailty and their family caregivers is not only an ethical imperative, but their input is particularly important as health and social care systems evolve from single-illness focused to those that account for the complex and chronic needs that accompany frailty. In this review, we summarize existing literature on engaging older adults living with frailty and their family caregivers across three settings: research, health and social care, and policy. We discuss strategies and barriers to engagement, and ethical and cultural factors and implications. Although this review is mainly focused on Canada it is likely to be broadly applicable to many of the health systems in the developed world where aging and frailty pose important challenges.

Measuring Patients' Experience of Rehabilitation Services Across the Care Continuum. Part II: Key Dimensions.

OBJECTIVES: To identify key dimensions of patients' experience across the rehabilitative care system and to recommend a framework to develop survey items that measure the rehabilitative care experience. DATA SOURCES: Data were sourced from a literature review that searched MEDLINE (PubMed), CINAHL (Ebsco), and PsycINFO (APA PsycNET) databases from 2004 to 2014, the reference lists of the final accepted articles, and hand searches of relevant journals. STUDY SELECTION: Four reviewers performed the screening process on 2472 articles; 33 were included for analysis. Interrater reliability was confirmed through 2 rounds of title review and 1 round of abstract review, with an average κ score of .69. DATA EXTRACTION: The final sample of 33 accepted articles was imported into a qualitative data analysis software application. Multiple levels of coding and a constant comparative methodology generated 6 themes. There were 502 discreet survey questions measuring patient experience that were categorized using the following dimensions: rehabilitative care ecosystem, client and informal caregiver engagement, patient and health care provider relation, pain and functional status, group and individual identity, and open ended. DATA SYNTHESIS: The most common survey questions examine the care delivery ecosystem (37%), the engagement of clients and their informal caregivers (24.9%), and the quality of relations between providers and patients (21.7%). Examination of patient's functional status and management of pain yielded (15.3%) of the instruments' questions. CONCLUSIONS: Currently available instruments and questions that measure patients' experience in rehabilitative care are unable to assess the performance of rehabilitative delivery systems that aspire to integrate care across the continuum. However, question panels derived from our 6 key themes may measure the key concepts that define rehabilitative care and facilitate measurement of patient experience at the system level.

Measuring Patients' Experience of Rehabilitation Services Across the Care Continuum. Part I: A Systematic Review of the Literature.

OBJECTIVE: To identify empirically tested survey instruments designed to measure patient experience across a rehabilitative care system. DATA SOURCES: A comprehensive search was conducted of the MEDLINE (PubMed), CINAHL (EBSCO), and PsycINFO (APA PsycNET) databases from 2004 to 2014. Further searches were conducted in relevant journals and the reference lists of the final accepted articles. STUDY SELECTION: Of 2472 articles identified, 33 were selected for inclusion and analysis. Articles were excluded if they were unrelated to rehabilitative care, were anecdotal or descriptive reports, or had a veterinary, mental health, palliative care, dental, or pediatric focus. Four reviewers performed the screening process. Interrater reliability was confirmed through 2 rounds of title review (30 articles each) and 1 round of abstract review (10 articles), with an average κ score of .69. DATA EXTRACTION: Data were extracted related to the instrument, study setting, and patient characteristics, including treated disease, type of rehabilitation (eg, occupational or physical therapy), methodology, sample size, and level of evidence. DATA SYNTHESIS: There were 25 discrete measurement instruments identified in the 33 articles evaluated. Seven of the instruments originated outside of the rehabilitative care sector, and only 1 measured service experience across the care continuum. CONCLUSIONS: As providers move to integrate rehabilitative care across the continuum from hospital to home, patients experience a system of care. Research is required to develop psychometrically tested instruments that measure patients' experience across a rehabilitative system.

Choosing Healthcare Options by Involving Canada's Elderly: a protocol for the CHOICE realist synthesis project on engaging older persons in healthcare decision-making.

INTRODUCTION: While patient and citizen engagement has been recognised as a crucial element in healthcare reform, limited attention has been paid to how best to engage seniors-the fastest growing segment of the population and the largest users of the healthcare system. To improve the healthcare services for this population, seniors and their families need to be engaged as active partners in healthcare decision-making, research and planning. This synthesis aims to understand the underlying context and mechanisms needed to achieve meaningful engagement of older adults in healthcare decision-making, research and planning. METHODS AND ANALYSIS: The CHOICE Knowledge Synthesis Project: Choosing Healthcare Options by Involving Canada's Elderly aims to address this issue by synthesising current knowledge on patient, family, and caregiver engagement. A realist synthesis will support us to learn from other patient and citizen engagement initiatives, from previous research, and from seniors, families and caregivers themselves. The synthesis will guide development or adaptation of a framework, leading to the development of best practice guidelines and recommendations for engagement of older people and their families and caregivers in clinical decision-making, healthcare delivery, planning and research. ETHICS AND DISSEMINATION: The components of this protocol involving consultation with patients or caregivers have received ethics clearance from the University of Waterloo, Office of Research Ethics (ORE#19094). After completion of the project, we will amalgamate the information collected into a knowledge synthesis report which will include best practice guidelines and recommendations for patient, family and caregiver engagement in clinical and health system planning and research contexts. RESULTS: Will be further disseminated to citizens, clinicians, researchers and policymakers with the help of our partners. TRIAL REGISTRATION NUMBER: CRD42015024749.

Measured outcomes of chronic care programs for older adults: a systematic review.

BACKGROUND: Wagner's Chronic Care Model (CCM), as well as the expanded version (ECCM) developed by Barr and colleagues, have been widely adopted as frameworks for prevention and management of chronic disease. Given the high prevalence of chronic illness in older persons, these frameworks can play a valuable role in reorienting the health care system to better serve the needs of seniors. We aimed to identify and assess the measured goals of E/CCM interventions in older populations. In particular, our objective was to determine the extent to which published E/CCM initiatives were evaluated based on population, community, system and individual-level outcomes (including clinical, functional and quality of life measures). METHODS: We conducted a systematic search of the Science Citation Index Web of Knowledge search tool to gather articles published between January 2003 and July 2014. We included published CCM interventions that cited at least one of the fundamental papers that introduced and described the CCM and ECCM. Studies retained for review reported evaluations of senior-focused E/CCM initiatives in community-based settings, with the topic of "older adults" OR senior* OR elder* OR geriatric OR aged. The resulting 619 published articles were independently reviewed for inclusion by two researchers. We excluded the following: systematic reviews, meta-analyses, descriptions of proposed programs, and studies whose populations did not focus on seniors. RESULTS: We identified 14 articles that met inclusion criteria. Studies used a wide range of measures, with little consensus between studies. All of the included studies used the original CCM. While a range of system-level and individual patient outcomes have been used to evaluate CCM interventions, no studies employed measures of population or community health outcomes. CONCLUSIONS: Future efforts to test E/CCM interventions with seniors would be aided by more consistent outcome measures, greater attention to outcomes for the caregivers of older persons with chronic illness, and a greater focus on population and community impacts.

Online strategies to facilitate health-related knowledge transfer: a systematic search and review.

BACKGROUND: Health interventions and practices often lag behind the available research, and the need for timely translation of new health knowledge into practice is becoming increasingly important. OBJECTIVE: The objective of this study was to conduct a systematic search and review of the literature on online knowledge translation techniques that foster the interaction between various stakeholders and assist in the sharing of ideas and knowledge within the health field. METHODS: The search strategy included all published literature in the English language since January 2003 and used the medline, Cumulative Index to Nursing and Allied Health Literature (cinahl), embase and Inspec databases. RESULTS: The results of the review indicate that online strategies are diverse, yet all are applicable in facilitating online health-related knowledge translation. The method of knowledge sharing ranged from use of wikis, discussion forums, blogs, and social media to data/knowledge management tools, virtual communities of practice and conferencing technology - all of which can encourage online health communication and knowledge translation. CONCLUSIONS: Online technologies are a key facilitator of health-related knowledge translation. This review of online strategies to facilitate health-related knowledge translation can inform the development and improvement of future strategies to expedite the translation of research to practice.

Novel protease produced by a Pasteurella trehalosi serotype 10 isolate from a pneumonic bighorn sheep: characteristics and potential relevance to protection.

A strain of Pasteurella trehalosi serotype 10, E(CO)-100, isolated from a bighorn sheep that had succumbed to pneumonic pasteurellosis during an epizootic, was compared to well-characterized strains of P. trehalosi serotype 10 and Mannheimia haemolytica serotype 1. The gene for leukotoxin A (lktA) from E(CO)-100 was sequenced and found to be identical on an amino acid basis to a published sequence for lktA from P. trehalosi serotype 10. However, the toxic activity in culture supernatant measured over time for E(CO)-100 was quite different from reference strains. Typically, the ability of the supernatant to lyse target cells increases over time corresponding to the logarithmic growth of the organism, peaks at mid to late phase, then declines gradually. Supernatant from E(CO)-100 exhibited a sharp decline in toxicity after mid-logarithmic growth to undetectable levels. Investigation of this anomaly using a commercial kit with a porcine gelatin/bovine albumin substrate matrix revealed high protease activity in the supernatant of this strain compared to another P. trehalosi serotype 10 and to a M. haemolytica serotype 1. Protease activity was also visualized using gelatin based zymogram gels. This protease was not substrate specific as it was shown to degrade leukotoxin. Activity was neutralized by bighorn sera in a titratable manner. There was an association between the ability to neutralize protease and low pneumonic lung scores in bighorn sheep experimentally challenged with E(CO)-100 (r=0.5, P=0.1). This previously unidentified protease may be an important protective antigen in vaccines designed to prevent pneumonic pasteurellosis resulting from P. trehalosi in bighorn sheep.

Mannheimia haemolytica serotype 1 and Pasteurella trehalosi serotype 10 culture supernatants contain fibrinogen-binding proteins.

Fibrinogen-binding proteins were found in the culture supernatants of Mannheimia haemolytica serotype 1 (ATCC 43270) and Pasteurella trehalosi serotype 10 (ECO-100). Sheep fibrinogen was biotinylated and shown to bind to proteins in the culture supernatants by modified western blot. Fibrinogen-binding proteins in the culture supernatant may be important virulence factors leading to the characteristic fibrinous pneumonia caused by these organisms and may be critical antigenic targets for immune prophylaxis.

Tracing the history of nuclear releases: determination of 129I in tree rings.

Concentrations of the long-lived radioisotope 1291 were measured in dated tree rings in order to determine whether the distribution of this isotope reflects the history of nuclear deposition. 129I concentrations and 129I/127I ratios were analyzed in tree rings and bark samples from four trees at West Valley, NY, and from one tree at Rochester, NY. West Valley was the site of short-lived nuclear fuel reprocessing activities (1966-1972), while Rochester, located 115 km to the northeast, provided a regional control site for the study. The selected trees reflect different modes of fluid and nutrient transport in trees, with three species of ring-porous trees (elm, oak, and locust), one semidiffuse (cherry), and one diffuse-porous tree (maple). The results show that 1291 levels in ring-porous trees, in which xylem or hydrologic tissue is localized in the outermost growth ring, are generally well correlated with the expected 1291 deposition pattern for the region. In contrast, tree rings of the more common semidiffuse to diffuse-porous wood, where xylem is disseminated throughout the trunk, show a less well developed 129I signal, probably due to the transport of iodine ions across annual rings. Iodine concentrations in the tree rings range from 0.04 to 2 mg/kg, 129I/127I ratios from 6 x 10(-10) to 3.8 x 10(-6). Tree bark and the outermost rings show significantly higher 129I concentrations than the wood of the trunk. The 129I/127I ratios for bark are very similar to values obtained for surface soil and water at the two localities, while inner rings have ratios similar to those in deeper layers of the soil, reflecting different pathways for 129I uptake and the differences in ambient 1291 levels between the atmosphere and deep soil. Although ring porous trees preserve the depositional pattern of nuclear releases, rings older than or close to the onset of the nuclear age have 129I/127I ratios significantly above the preanthropogenic level, suggesting that even in these trees some redistribution of 129I occurs throughout the trunk. Our results indicate that growth rings from ring-porous wood are useful in time-series analyses of regional 129I deposition, yielding reliable information on relative changes in 129I concentrations but requiring caution in the reconstruction of absolute ambient concentrations during any given time.