Publications

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prevalence and pathogenic potential of campylobacter isolates from free-living, human-commensal american crows.recent studies have suggested a potential role for wild birds in zoonotic transmission of campylobacter jejuni, the leading cause of gastroenteritis in humans worldwide. in this study, we detected campylobacter spp. in 66.9% (85/127) of free-ranging american crows (corvus brachyrhyncos) sampled in the sacramento valley of california in 2012 and 2013. biochemical testing and sequence analysis of 16s rrna revealed that 93% of isolates (n = 70) were c. jejuni, with cytolethal distending toxin (cdt) ...201424375131
using major outer membrane protein typing as an epidemiological tool to investigate outbreaks caused by milk-borne campylobacter jejuni isolates in california.we describe using major outer membrane protein (momp) typing as a screen to compare the campylobacter jejuni pora gene sequences of clinical outbreak strains from human stool with the pora sequences of dairy farm strains isolated during two milk-borne campylobacteriosis outbreak investigations in california. the genetic relatedness of clinical and environmental strains with identical or closely related pora sequences was confirmed by multilocus sequence typing and pulsed-field gel electrophoresi ...201323115263
isolation of campylobacter from feral swine (sus scrofa) on the ranch associated with the 2006 escherichia coli o157:h7 spinach outbreak investigation in california.we report the isolation of campylobacter species from the same population of feral swine that was investigated in san benito county, california, during the 2006 spinach-related escherichia coli o157:h7 outbreak. this is the first survey of campylobacter in a free-ranging feral swine population in the united states. campylobacter species were cultured from buccal and rectal-anal swabs, colonic faeces and tonsils using a combination of selective enrichment and antibiotic-free membrane filtration m ...201222405465
prevalence of selected bacterial and parasitic agents in feces from diarrheic and healthy control cats from northern california.background: bacterial and parasitic agents are commonly implicated as causes of diarrhea in cats, but there is a paucity of information evaluating epidemiological and prevalence factors associated with most of these organisms in cats. objectives: determine the prevalence of selected enteropathogens in diarrheic and nondiarrheic cats. animals: a total of 219 diarrheic and 54 nondiarrheic cats. methods: prospective study. fresh fecal specimens were submitted for centrifugation flotation, culture, ...201122182203
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
risk factors for infection with pathogenic and antimicrobial-resistant fecal bacteria in northern elephant seals in california.the goal of this study was to identify potential environmental and demographic factors associated with campylobacter jejuni (c. jejuni), salmonella enterica (salmonella spp.), and antimicrobial-resistant escherichia coli (e. coli) infection in northern elephant seals stranded along the california coastline.200819006978
campylobacter insulaenigrae isolates from northern elephant seals (mirounga angustirostris) in california.there are only two reports in the literature demonstrating the presence of campylobacter spp. in marine mammals. one report describes the isolation of a new species, campylobacter insulaenigrae sp. nov., from three harbor seals (phoca vitulina) and a harbor porpoise (phocoena phocoena) in scotland, and the other describes the isolation of campylobacter jejuni, campylobacter lari, and an unknown campylobacter species from northern elephant seals (mirounga angustirostris) in california. in this st ...200717259365
dissemination of antimicrobial resistant strains of campylobacter coli and campylobacter jejuni among cattle in washington state and california.the purpose of this study was to investigate the genetic similarity of campylobacter jejuni and campylobacter coli with similar antimicrobial resistance phenotypes, isolated from cattle on different farms and at different times, in order to evaluate the possible existence of disseminated antimicrobial resistant clones. pfge after smai and kpni restriction identified 23 and 16 distinct pfge patterns among 29 c. jejuni and 66 c. coli isolates, respectively. in c. coli, 51 (77%) of the resistant is ...200717321701
an examination of risk factors associated with beef cattle shedding pathogens of potential zoonotic concern.the prevalence of three waterborne zoonotic pathogens (campylobacter sp., giardia sp. and cryptosporidium parvum) in rectal faecal samples from a random sample of adult beef cattle was determined. management factors that may be associated with shedding of these organisms were examined. for campylobacter sp. prevalence was 5.0%, and the number of females on the farm was positively associated with the proportion that tested positive. for giardia sp. prevalence was 6.5%, and none of the management ...200111561967
disease reporting from an automated laboratory-based reporting system to a state health department via local county health departments.the authors assessed the completeness of disease reporting from a managed care organization's automated laboratory-based reporting system to the california department of health services (cdhs) via local public health departments.200112034915
an outbreak of bacteremic campylobacter jejuni infection.during september 1980, an outbreak of bacteremic campylobacter jejuni infection occurred in metropolitan los angeles. the outbreak was recognized when blood cultures obtained from 11 previously healthy persons with acute febrile illnesses (characterized in over 80% by fever, diarrhea, and headaches) were positive for c. jejuni. all recovered after an illness that lasted a mean of 8 days. a surveillance system failed to reveal a concomitant outbreak of gastroenteritis. isolates had identical bioc ...19921734239
prevalence of campylobacter jejuni in two california chicken processing plants.two federally inspected california chicken processing plants participated in campylobacter jejuni prevalence studies. twelve sampling sites were included in each of four groups. groups were based on bird age, scald water temperature, and plant sampled. scald water temperatures of 60 degrees c (140 degrees f) did not contribute to a lower prevalence of c. jejuni in edible parts, as did temperatures of 53 degrees c (127 degrees f) and 49 degrees c (120 degrees f). the feather picker and chilling t ...19836830212
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