Publications

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a dynamic, optimal disease control model for foot-and-mouth-disease: ii. model results and policy implications.a dynamic optimization model was used to search for optimal strategies to control foot-and-mouth disease (fmd) in the three-county region in the central valley of california. the model minimized total regional epidemic cost by choosing the levels of depopulation of diagnosed herds, preemptive depopulation, and vaccination. impacts of limited carcass disposal capacity and vaccination were also examined, and the shadow value, the implicit value of each capacity, was estimated. the model found that ...200717280730
rabies surveillance in the united states during 2006.during 2006, 49 states and puerto rico reported 6,940 cases of rabies in animals and 3 cases in humans to the cdc, representing an 8.2% increase from the 6,417 cases in animals and 1 case in a human reported in 2005. approximately 92% of the cases were in wildlife, and 8% were in domestic animals. relative contributions by the major animal groups were as follows: 2,615 raccoons (37.7%), 1,692 bats (24.4%), 1,494 skunks (21.5%), 427 foxes (6.2%), 318 cats (4.6%), 82 cattle (1.2%), and 79 dogs (1. ...200717696853
biosecurity practices and travel history of individuals exhibiting livestock at the 2005 california state fair.to determine biosecurity practices and travel history of individuals exhibiting livestock at the 2005 california state fair.200717696860
balamuthia amebic encephalitis--california, 1999-2007.balamuthia mandrillaris is a free-living ameba that causes encephalitis in humans (both immunocompetent and immunocompromised), horses, dogs, sheep, and nonhuman primates. the ameba is present in soil and likely is transmitted by inhalation of airborne cysts or by direct contamination of a skin lesion. approximately 150 cases of balamuthiasis have been reported worldwide since recognition of the disease in 1990. balamuthiasis is difficult to diagnose because 1) the clinical symptoms mimic those ...200818636064
emergence of a tetracycline-resistant campylobacter jejuni clone associated with outbreaks of ovine abortion in the united states.campylobacter infection is one of the major causes of ovine abortions worldwide. historically, campylobacter fetus subsp. fetus was the major cause of campylobacter-associated abortion in sheep; however, campylobacter jejuni is increasingly associated with sheep abortions. we examined the species distribution, genotypes, and antimicrobial susceptibilities of abortion-associated campylobacter isolates obtained from multiple lambing seasons on different farms in iowa, idaho, south dakota, and cali ...200818322054
methicillin-resistant staphylococcus aureus skin infections from an elephant calf--san diego, california, 2008.methicillin-resistant staphylococcus aureus (mrsa) infections are a major cause of human skin and soft tissue infections in the united states. mrsa colonization and infection also have been observed in turtles, bats, seals, sheep, rabbits, rodents, cats, dogs, pigs, birds, horses, and cattle, and mrsa infections with an epidemiologic link to animal contact have been reported in veterinary personnel, pet owners, and farm animal workers. on january 29, 2008, the county of san diego health and huma ...200919265780
an ecologic study comparing distribution of pasteurella trehalosi and mannheimia haemolytica between sierra nevada bighorn sheep, white mountain bighorn sheep, and domestic sheep.the prevalence and phenotypic variability of pasteurella and mannheimia isolates from sierra nevada bighorn sheep (ovis canadensis sierrae), white mountain bighorn sheep (ovis canadensis nelsoni), and domestic sheep (ovis aries) from california, usa, were compared. the white mountain bighorn sheep population had a recent history of pneumonia-associated mortality, whereas the sierra nevada bighorn sheep population had no recent history of pneumonia-associated mortality. the domestic sheep flocks ...200919901369
pleistocene to historic shifts in bald eagle diets on the channel islands, california.studies of current interactions among species, their prey, and environmental factors are essential for mitigating immediate threats to population viability, but the true range of behavioral and ecological flexibility can be determined only through research on deeper timescales. ecological data spanning centuries to millennia provide important contextual information for long-term management strategies, especially for species that now are living in relict populations. here we use a variety of meth ...201020439737
population-specific vital rate contributions influence management of an endangered ungulate.to develop effective management strategies for the recovery of threatened and endangered species, it is critical to identify those vital rates (survival and reproductive parameters) responsible for poor population performance and those whose increase will most efficiently change a population's trajectory. in actual application, however, approaches identifying key vital rates are often limited by inadequate demographic data, by unrealistic assumptions of asymptotic population dynamics, and of equ ...201020945773
Developing a sustainable phytomanagement strategy for excessive selenium in western United States and India.Phytomanagement technology is recognized as an inexpensive and environmental friendly strategy for managing natural-occurring selenium (Se) in soils and in poor quality waters. Multi-year field and greenhouse studies were conducted with different plant species in California, USA and Punjab, India under high Se growing conditions. Some of the plant species included; canola (Brassica napus), mustard (B. juncea), broccoli (B. oleracea), spearmint (Mentha viridis), sugarcane (Saccharum officcinarum) ...201122046761
prevalence and molecular characterization of escherichia coli o157:h7 by multiple-locus variable-number tandem repeat analysis and pulsed-field gel electrophoresis in three sheep farming operations in california.a year-long study was conducted to determine the fecal prevalence of escherichia coli o157:h7 in three sheep ranches. strain diversity and persistence were compared with multiple-locus variable-number tandem repeat analysis and pulsed-field gel electrophoresis. ranch c, a feedlot, consisted of young sheep raised predominantly on a high-grain diet. the other two sites consisted of sheep raised on native pasture and a combination of native and irrigated pasture. forty fecal samples were collected ...201121902909
hierarchical distance-sampling models to estimate population size and habitat-specific abundance of an island endemic.population size and habitat-specific abundance estimates are essential for conservation management. a major impediment to obtaining such estimates is that few statistical models are able to simultaneously account for both spatial variation in abundance and heterogeneity in detection probability, and still be amenable to large-scale applications. the hierarchical distance-sampling model of j. a. royle, d. k. dawson, and s. bates provides a practical solution. here, we extend this model to estimat ...201223210315
reference intervals for mineral concentrations in whole blood and serum of bighorn sheep (ovis canadensis) in california.whole blood and serum mineral concentrations were measured in diverse bighorn sheep (ovis canadensis) metapopulations in california, and 90% reference intervals were determined. while there were some statistical differences between median concentrations among the different metapopulations, detected values were generally in good agreement with concentrations reported for other bighorn sheep populations and with reference ranges widely accepted for domestic sheep (ovis aries). although median whol ...201222529120
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