| isolation of leptospira hardjo from kidneys of ontario cattle at slaughter. | kidneys from 117 cattle from 110 ontario farms were examined at slaughter for leptospires. leptospira hardjo (hardjo-bovis a) was isolated from 11 kidneys and l. kennewicki from one. the isolations were all made (12/89, 13.5%) from beef cattle from feedlots, no isolates being obtained from dairy or beef cattle from extensive farms (0/28). isolations were only made from cattle with antibody titers (greater than or equal to 20) against the serovars recovered. isolation was more sensitive than immu ... | 1987 | 3300922 |
| leptospirosis in horses in ontario. | sera from thoroughbred and standardbred horses in southwest ontario were tested for antibody to seven leptospira interrogans serovars (autumnalis, bratislava, canicola, grippotyphosa, hardjo, icterohaemorrhagiae, pomona), using the microscopic agglutination test. there was significantly higher seroprevalence of bratislava than of other serovars, in which prevalence was low. seroprevalence of bratislava increased significantly with age; only 5% of two to three year old horses had titers greater t ... | 1987 | 3330964 |
| seroprevalence and association with abortion of leptospirosis in cattle in ontario. | sera were collected using a systematic random sampling from 348 cattle herds in ontario, in proportion to the cattle population in different areas. one cow in five from 296 dairy herds and one in three from 52 beef herds were sampled. the sera were analyzed for prevalence of antibodies to leptospira interrogans serovar grippotyphosa, hardjo, icterohaemorhagiae and pomona using the microscopic agglutination test. herd seroprevalence (one or more animals with titer greater than or equal to 80) in ... | 1988 | 3370556 |
| leptospirosis in red foxes in ontario. | the role of the red fox (vulpes vulpes) in the epizootiology of leptospirosis in southwestern ontario was investigated in 1973-1974. leptospira interrogans serovar pomona (kennewicki by dna analysis) was isolated from the kidneys of three of eight foxes tested. severe hemorrhagic nephritis and interstitial nephritis were common to these foxes and to five others out of nine foxes examined. autumnalis antibodies were detected at titers 10(-2) to 10(-5) in 12 of 100 fox sera. pomona antibodies occu ... | 1986 | 3503132 |
| leptospires in finger nail clams. | | 1971 | 5156485 |
| the prevalence of leptospirosis and its association with multifocal interstitial nephritis in swine at slaughter. | an abattoir survey was undertaken to determine the prevalence of leptospirosis and its association with lesions of multifocal interstitial nephritis (so-called "white spotted kidneys") in swine at slaughter. both cross-sectional and case-control study designs were used. of 197 kidneys from hogs randomly selected at slaughter, 11 (5.6%) had generalized grey-white foci typical of multifocal interstitial nephritis (mfin). antibody titers greater than or equal to 1:80 against leptospira pomona were ... | 1989 | 2766150 |
| serological survey of dogs from toronto for leptospiral antibodies. | | 1976 | 949675 |
| correlation of bedrock type with the geography of leptospirosis. | leptospirosis occurs enzootically over most of southern ontario. leptospira pomona is the serotype most commonly found in outbreaks. antibodies to l. pomona occur frequently in the sera of deer in wilderness areas. the geographic location of leptospirosis presents a pattern which closely parallels the distribution of paleozoic bedrock. by contrast, l. pomona infection is absent from areas underlain by precambrian bedrock. comparisons of water chemistry, soil type, habitat, and host and pathogen ... | 1970 | 4246001 |
| increase in seroprevalence of canine leptospirosis and its risk factors, ontario 1998-2006. | canine leptospirosis has been described as having re-emerged in north america around the mid-1990s, with a change in the epidemiology of the infecting serovars responsible for the disease emergence. a retrospective case-control study was conducted to examine the re-emergence of seroprevalent cases of canine leptospirosis in ontario using serology submission records from 1406 dogs from january 1, 1998 to december 31, 2006. the data collected [results of the microscopic agglutination test (mat), v ... | 2009 | 19794888 |
| canine leptospirosis in canada: a veterinarian's perspective. | | 2008 | 18268264 |
| longitudinal study on the seroprevalence of avian influenza, leptospirosis, and tularemia in an urban population of raccoons (procyon lotor) in ontario, canada. | raccoons (procyon lotor) live at high densities, often in close association with people, in urban areas in ontario and have been implicated as potential reservoirs of numerous zoonotic disease agents. we collected 137 blood samples from 61 apparently healthy raccoons in a small area of toronto, ontario, from june to october 2007 as part of a longitudinal study to determine the seasonal patterns of seroprevalence of francisella tularensis, avian influenza, and leptospira. in addition, we collecte ... | 2011 | 20491583 |
| resurgence of leptospirosis in dogs in ontario: recent findings. | a marked increase in leptospirosis in dogs was observed in 2000, part of an increasing trend observed in previous years in ontario. the highest frequency of seropositive cases occurred from september to december 2000, with the peak in november. large breed dogs were particularly affected. clinical and clinicopathological data for 31 dogs admitted between 1998 and 2000 to the ontario veterinary college veterinary teaching hospital were analyzed. major clinical presenting features were acute onset ... | 2002 | 12561690 |