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characteristics of hiv infection in patients fifty years or older in michigan.this study analyzed factors associated with human immunodeficiency virus (hiv) infection among persons ages 50 years or older at hiv diagnosis and examined differences in morbidity and survival between them and those ages 13 to 49 years. hiv-infected persons reported to the michigan hiv/aids registry between january 1990 and october 2000 were analyzed. of 12,614 hiv-infected persons selected, 938 (7.4%) were ages 50 years or older at hiv diagnosis. persons ages 50 years or older at hiv diagnosis ...200111788066
prevalence of michigan dairy herds infected with mycobacterium avium subspecies paratuberculosis as determined by environmental sampling.a cross-sectional, stratified random survey of michigan dairy herds was conducted to estimate the prevalence of herds infected with mycobacterium avium paratuberculosis (map), the causative agent of johne's disease, in michigan using targeted environmental sampling. one pooled sample each from the primary manure storage area and a high-traffic common cow area from each herd was collected and cultured for map using the esp culture system ii. a herd was classified as positive if at least one sampl ...200919359059
longitudinal study of the distribution of mycobacterium avium subsp. paratuberculosis in the environment of dairy herds in the michigan johne's disease control demonstration herd project.the objective of this study was to describe the distribution of mycobacterium avium subsp. paratuberculosis (map) in the environment of infected dairy farms over time. johne's disease (jd) prevalence was monitored annually in 7 michigan dairy herds. environmental samples were collected bi-annually and cultured for map. of 731 environmental samples that were cultured, 81 (11%) were positive. the lactating cow floor and manure storage areas were the areas most commonly contaminated, representing 3 ...200920046602
association between risk-assessment scores and individual-cow johne's disease-test status over time on seven michigan, usa dairy herds.to evaluate the effectiveness of management practices implemented to control the spread of johne's disease (jd), we conducted a 5-year observational study (january 2003 to december 2007) on seven michigan, usa dairy herds containing cows infected with mycobacterium avium subsp. paratuberculosis (map; the causative agent of the disease). the jd incidence and prevalence was monitored in each herd annually by serum elisa and/or fecal culture of all adult cows. a jdcp was designed specifically for e ...201021030097
epizootiologic survey of mycobacterium bovis in wildlife and farm environments in northern michigan.bovine tuberculosis (bovine tb), caused by mycobacterium bovis, has reemerged in northern michigan, usa, with detections in white-tailed deer (odocoileus virginianus) in 1994 and in cattle in 1998. since then, significant efforts have been directed toward reducing deer densities in the area in the hopes of reducing the bovine tb prevalence rate in deer and eliminating spillover of the disease into cattle. despite the success of the efforts to reduce deer densities, additional cattle herds have b ...201020688630
quality of care for hiv infection provided by ryan white program-supported versus non-ryan white program-supported facilities.the ryan white hiv/aids care act (now the treatment modernization act; ryan white program, or rwp) is a source of federal public funding for hiv care in the united states. the health services and resources administration requires that facilities or providers who receive rwp funds ensure that hiv health services are accessible and delivered according to established hiv-related treatment guidelines. we used data from population-based samples of persons in care for hiv infection in three states to ...200818806878
detection of mycobacterium avium subspecies paratuberculosis in naturally exposed dairy heifers and associated risk factors.an observational prospective study was conducted to identify risk factors associated with fecal shedding of mycobacterium avium ssp. paratuberculosis (map) in naturally exposed dairy heifers. the study population consisted of heifers from 8 dairy herds in michigan participating in a map control demonstration project. ten heifers from 4 age groups (0 to 3, 4 to 6, 7 to 14, and 15 to 24 mo) were selected from each herd every 4 mo for 28 mo and tested for the presence of map by fecal culture (fc). ...201121854939
bovine leukemia virus and mycobacterium avium subsp. paratuberculosis are not associated with shiga toxin-producing escherichia coli shedding in cattle.bovine leukemia virus (blv) is a retrovirus that causes enzootic bovine leukosis in cattle, and mycobacterium avium subsp. paratuberculosis (map) is the etiologic agent of johne's disease in cattle. both diseases are chronic in nature and can lead to the disruption of normal immunological or physiological processes. cattle are the major reservoir of shiga toxin-producing escherichia coli (stec), a cause of foodborne illness in humans. we tested the hypothesis that cattle infected with blv or map ...201728221870
the effect of subclinical mycobacterium paratuberculosis infection on milk production in michigan dairy cows.the objective of this study was to determine the effect of subclinical mycobacterium paratuberculosis infection on mature equivalent milk, protein, and fat production in a sample of michigan dairy herds with a history of cows positive for m. paratuberculosis diagnosed by fecal culture. a prospective two-group cohort study was conducted. participating herds were tested, and productivity and reproduction records were monitored for 18 mo. all cows aged 24 mo and greater were tested for m. paratuber ...200111699450
distribution and environmental risk factors for paratuberculosis in dairy cattle herds in michigan.to determine prevalence of paratuberculosis among dairy cattle herds and to identify associated soil-related risk factors.199910328429
the effect of subclinical mycobacterium paratuberculosis infection on days open in michigan, usa, dairy cows.a prospective cohort study design was used to evaluate the impact of subclinical mycobacterium paratuberculosis infection on days open in a sample of michigan dairy herds with a history of cows positive for m. paratuberculosis diagnosed by fecal culture. participating herds were tested and productivity and reproduction records were monitored for 18 months. all cows > or = 24 months old were tested for m. paratuberculosis infection using the elisa and radiometric fecal-culture (rfc) techniques. t ...200010913802
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