Publications

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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
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
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
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
herd-level economic analysis of the impact of paratuberculosis on dairy herds.to perform a herd-level analysis of economic losses associated with paratuberculosis in dairy herds.199910101415
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
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
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