| clinical mastitis in dairy cattle in ontario: frequency of occurrence and bacteriological isolates. | the objective of this study was to describe the frequency of occurrence of clinical mastitis in dairy herds in ontario. the study group consisted of 65 dairy farms involved in a 2-year observational study, which included recording all clinical mastitis cases and milk sampling of quarters with clinical mastitis. lactational incidence risks of 9.8% for abnormal milk only, 8.2% for abnormal milk with a hard or swollen udder, and 4.4% for abnormal milk plus systemic signs of illness related to masti ... | 1998 | 9442950 |
| identification of is1356, a new insertion sequence, and its association with is402 in epidemic strains of burkholderia cepacia infecting cystic fibrosis patients. | burkholderia cepacia is now recognized as an important opportunistic pathogen in cystic fibrosis (cf) and other compromised patients. epidemicity among cf patients has been attributed to at least one particularly infectious strain (strain et12), and both genetic evidence and anecdotal evidence suggest that this strain, currently endemic in ontario, and those causing an epidemic in the united kingdom, are indeed the same. our study was conducted to determine whether there was any association betw ... | 1996 | 8784555 |
| characterization of strains of corynebacterium bovis. | the biochemical and morphological characteristics of 104 strains of corynebacterium bovis isolated from bovine milk samples and the c. bovis reference strain were found to be uniform. valuable criteria for identification were presence of catalase and oxidase, production of acid from glucose and fructose and a requirement for enriched basal media. six strains of human and three strains of bovine origin were found to be inconsistent with the reference strain. | 1984 | 6722650 |
| drug resistance among pathogenic bacteria from animals in ontario. | prevalence of antimicrobial drug resistance among over 3000 clinical isolates of animal pathogens in ontario during 1971-72 has been studied. a high number of multiple resistance patterns is prevalent among members of enterobacteriaceae, especially escherichia coli and salmonella typhimurium. the most common resistance pattern among bovine strains was against not less than six drugs in common use. among different animal species the bovine population was found to be the source of a high percentag ... | 1974 | 4277443 |
| corynebacterium equi lymphadenitis in ontario cattle. | | 1979 | 466639 |
| toxigenic diphtheria in two isolated northern communities. | | 1991 | 1365150 |
| epidemiological survey of corynebacterium equi infections on five ontario horse farms. | corynebacterium equi was cultured from manure or soil on five horse-breeding farms in ontario at monthly intervals on three occasions during the summer of 1982. the organism was widespread. contamination by c. equi of the loafing paddock and pasture areas was significantly greater in a farm established 30 years than in two established for four and six years and there was a significant correlation between the c. equi burden in stables, paddocks and pastures and the length of use of the five farms ... | 1984 | 6713248 |
| an observational study of corynebacterium bovis in selected ontario dairy herds. | an observational study of corynebacterium bovis was conducted in 74 ontario dairy herds. the levels of infection with c. bovis were 19.9, 36.2 and 85.6% at the quarter, cow and herd level, respectively. teat disinfection was found to be the variable best able to distinguish between herds with a high or low c. bovis quarter infection rate. mean total milk somatic cell counts for 1103 quarters and 107 cows infected with only c. bovis ranged between 150,000 and 200,000/ml and were significantly hig ... | 1983 | 6831308 |