Publications

mass screening of cattle sera against 14 infectious disease agents, using an elisa system for monitoring health in livestock.	mass screening elisa methods were developed for testing cattle serum for antibodies against 14 common livestock diseases simultaneously. the absorbance values were transformed to a %elisa (spectrophotometric antibody end point) by a computer interfaced with a microplate reader. a histogram indicating a cutoff point and a report for the veterinarian also was generated. the computer program produced a print-out of the antibody profile for each animal tested, the antibody concentration against each ...	1991	1767993
enteric pathogens in intensively reared veal calves.	observations were made on development of diarrhea in special-fed calves (n = 460) on 8 commercial facilities during 2 successive 16-week production cycles at weeks 0, 2, 4, 8, 12, and 16. a total of 23% were affected, with peak number of calves with diarrhea observed at week 0. suspected enteropathogens were identified in 86% of these calves, most commonly cryptosporidia, coronavirus, and rotavirus. identified potential zoonotic pathogens included giardia and salmonella spp and verotoxigenic esc ...	1994	7879973
descriptive epidemiology of postnatal bovine viral diarrhea virus infection in intensively managed dairy heifers.	to evaluate risk of bovine viral diarrhea virus (bvdv) infection between birth and 9 months of age for dairy replacement heifers raised under typical dry-lot management conditions.	2001	11724183
serological evaluation of precolostral serum samples to detect bovine viral diarrhea virus infections in large commercial dairy herds.	the authors propose that screening newborn calves for bovine viral diarrhea virus (bvdv) antibody prior to colostrum feeding is a useful strategy to detect herds with endemic bvdv infection. in the current study, precolostral serum samples of newborn calves in 2 minnesota and 2 california dairy farms were examined. precolostral bvdv antibodies were detected by serum neutralization and enzyme-linked immunosorbent assay in 7.4% (33/446) and 6.2% (32/515) of newborn calves in the california and min ...	2008	18776097
serosurveillance for livestock pathogens in free-ranging mule deer (odocoileus hemionus).	routine disease surveillance has been conducted for decades in mule deer (odocoileus hemionus) in california for pathogens shared between wildlife and domestic ruminants that may have implications for the animal production industry and wildlife health. deer sampled from 1990 to 2007 (n = 2,619) were tested for exposure to six pathogens: bluetongue virus (btv), epizootic hemorrhagic disease virus (ehdv), bovine viral diarrhea virus (bvdv), leptospira spp., anaplasma spp. and brucella spp. we eval ...	2012	23209790
evaluation of bovine abortion cases and tissue suitability for identification of infectious agents in california diagnostic laboratory cases from 2007 to 2012.	establishing a definitive cause of bovine abortion is a challenging problem faced by veterinary practitioners and diagnosticians. detection of an infectious or noninfectious source for abortion may facilitate interventions that mitigate future fetal loss in the herd. the purposes of this study were to identify the most common causes of bovine abortion in cases submitted to the california animal health and food safety laboratory system, davis (cahfs) from 2007 to 2013 and to determine if detectio ...	2016	26679514
cecal infarction in neonatal calves.	cecal infarction is an uncommon lesion in calves that results in localized peritonitis and, on occasion, perforation with secondary diffuse peritonitis and death. this lesion in calves has not been described previously. we reviewed the postmortem cases of cecal infarction in dairy calves ≤30 d of age that had been submitted over the course of 5 y to the tulare branch of the california animal health and food safety laboratory system. the area of cecal infarction and the associated lesion margins ...	2017	28114867