Publications

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the frequency, distribution and effects of antibodies, to seven putative respiratory pathogens, on respiratory disease and weight gain in feedlot calves in ontario.during 1983-85, 279 calves requiring treatment for bovine respiratory disease and 290 comparison (control) animals from 15 different groups of feedlot calves were bled on arrival and again at 28 days postarrival. their sera were then analyzed for antibodies to seven putative respiratory pathogens. on arrival, the prevalences of indirect agglutination titers to pasteurella haemolytica, p. haemolytica cytotoxin, mycoplasma bovis and m. dispar were greater than 50%, the prevalence of titers to bovi ...19892766158
yersinia enterocolitica and yersinia pseudotuberculosis from wildlife in ontario. 19744612176
causes of death in captive wild waterfowl in the kortright waterfowl park, 1967-1970. 19715163738
a field trial, of preshipment vaccination, with intranasal infectious bovine rhinotracheitis-parainfluenza-3 vaccines.a total of 849 calves, 278 controls, 335 vaccinated intranasally with ibr-pi3/ts and 236 vaccinated intranasally with ibr-pi3/ptc were studied in a field trial of preimmunization. all calves were vaccinated in saskatchewan at least three weeks prior to shipment to feedlots. four hundred and twenty six calves were not sold within eight weeks of vaccination; however, seven of these died within four weeks of vaccination. treatment rates varied from 1.0% to 5.2%. there was no significant effect of v ...19836315194
antibody titers to pasteurella haemolytica a1 in ontario beef cattle.indirect bacterial agglutination titers to pasteurella haemolytica a1 were determined in serum, thoracic, pericardial, or peritoneal fluid from cattle necropsied as part of the bruce county beef project in 1979-80 and 1980-81. antibody titers were also assayed in serum from 84 calves on entry to feedlots in the fall of 1979. titers on entry were low compared to antibody levels at necropsy. cattle which died with pneumonia, in particular those dying of fibrinous pneumonia (shipping fever), had lo ...19826756619
antimicrobial use in feedlot calves: its association with culture rates and antimicrobial susceptibility.data were collected on anti-microbial usage and health problems, in beef feedlot calves. although the association between them was not significant, many feedlot owners did not use recommended dosages or duration of treatment and this may have led to a reduced recovery rate.injectable tetracyclines were the most frequent antimicrobial for primary treatment of sick calves; whereas chloramphenicol was selected most frequently when the primary treatment appeared to be ineffective. treatment with ant ...19836831306
genomic fingerprinting of "haemophilus somnus" isolates by using a random-amplified polymorphic dna assay.the random-amplified polymorphic dna (rapd) assay was used to generate dna fingerprints for 16 isolates of "haemophilus somnus," and one isolate each of "haemophilus agni," "histophilus ovis," "actinobacillus seminis," pasteurella haemolytica, and escherichia coli. the rapd assay differentiated among "h. somnus" isolates, which shared similarity coefficients of 0.46 to 1.00 on the basis of pairwise comparisons of rapd markers produced with nine random decamer primers. three virulent encephalitic ...19938458944
the association of titers to haemophilus somnus, and other putative pathogens, with the occurrence of bovine respiratory disease and weight gain in feedlot calves.serum samples were obtained from 602 calves (from 19 groups in four feedlots: three in ontario, and one in alberta) upon arrival at the feedlot and 28 d later. of these calves, 202 developed bovine respiratory disease (brd) and 400 did not develop brd. based on high antibody titers noted upon arrival, we infer that most calves were exposed to haemophilus somnus prior to arrival at the feedlot. within a group, calves with high titers on arrival had a reduced risk of developing brd later. most cal ...19989798091
prevalence of zoonotic agents in dogs visiting hospitalized people in ontario: implications for infection control.visitation of hospitalized people by dogs is becoming commonplace, but little is known about the potential health risks of introducing dogs to healthcare settings. this cross-sectional study evaluated the prevalence of zoonotic agents in a group of 102 visitation dogs from a variety of sources across ontario. between may and july 2004, owners were interviewed by a standardized questionnaire while dogs underwent a standardized physical examination. one specimen of faeces, hair-coat brushings and ...200616466831
diseases and pathogens associated with mortality in ontario beef feedlots.this study determined the prevalence of diseases and pathogens associated with mortality or severe morbidity in 72 ontario beef feedlots in calves that died or were euthanized within 60 days after arrival. routine pathologic and microbiologic investigations, as well as immunohistochemical staining for detection of bovine viral diarrhea virus (bvdv) antigen, were performed on 99 calves that died or were euthanized within 60 days after arrival. major disease conditions identified included fibrinos ...200616566254
survey on the incidence of yersinia enterocolitica in the province of ontario. 19734586389
survey on the incidence of yersinia enterocolitica infection in canada.data pertaining to 278 cultures of yersinia enterocolitica isolated in canada are summarized in this paper. of this amount, 256 were isolated from humans, whereas 22 were of nonhuman sources. the typing of these cultures is presented together with their geographical location. y. enterocolitica serotype o:3 biotype 4, phage type 9b, was practically the only serotype present in the province of quebec. this serotype o:3 was also predominant in ontario, followed by serotypes o:5,27 and o:6,30; other ...19744472776
microbiological identification and analysis of swine tonsils collected from carcasses at slaughter.the primary objective of this 7-month study was to determine the prevalence of porcine pathogens of the tonsil of the soft palate of swine at slaughter. additional objectives were to determine if sampling the carcasses of normal or abnormal hogs provided different microbiological profiles and if the slaughter plant provides a feasible sampling frame and environment for detecting and monitoring important pathogens in tonsils that have health implications for both swine and humans. a total of 395 ...201121731180
prevalence of actinobacillus pleuropneumoniae, actinobacillus suis, haemophilus parasuis, pasteurella multocida, and streptococcus suis in representative ontario swine herds.tonsillar and nasal swabs were collected from weanling pigs in 50 representative ontario swine herds and tested for the presence of 5 important bacterial upper respiratory tract pathogens. all but 1 herd (2%) tested positive for streptococcus suis by polymerase chain reaction (pcr); 48% of herds were s. suis serovar 2, 1/2 positive. in all but 2 herds there was evidence of haemophilus parasuis infection. in contrast, toxigenic strains of pasteurella multocida were detected by a p. multocida--enz ...200818505187
characterization of pasteurella multocida isolated from rabbits in canada.in a survey for the somatic and capsular serotypes of pasteurella multocida present in domestic rabbits in canada, but mainly in ontario, samples were obtained from research facilities, commercial rabbitries and from abattoir and necropsy specimens. sources of isolates were upper respiratory tract infections, localized bronchopneumonias , acute fibrinous pneumonias, abscesses and otitis media. of 59 isolates obtained, 47.0% were type 12:a, 30.5% 3:d and 12.0% were 3:a. less common types were 12( ...19846722644
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