Leptospira Interrogans Serovar Hardjo Infection of Cattle

Gordon, L. M.

doi:10.1111/j.1751-0813.1979.tb09532.x

Cited by 15 publications

(3 citation statements)

References 13 publications

(5 reference statements)

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“…10 Reported estimates of the herd prevalence of Leptospira infection in dairy and beef operations in North America range from 35% to 60%, with most infections likely due to serovar Hardjo. [11][12][13][14] A seroprevalence study 15 in Canada, for example, found that 23 of 52 (44%) beef herds were positive for strain hardjobovis. A recent study 16 in the United States found that 28 of 67 (42%) herds were positive for strain hardjobovis, and Bolin 17 reported that for the overall US dairy herd, the rate of infection with strain hardjobovis was 57%.…”

mentioning

confidence: 99%

A field study of the effects of a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine administered with oxytetracycline on reproductive performance in beef cattle

Kasimanickam¹,

Whittier²,

Collins³

et al. 2007

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mentioning

confidence: 99%

A field study of the effects of a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine administered with oxytetracycline on reproductive performance in beef cattle

Kasimanickam¹,

Whittier²,

Collins³

et al. 2007

javma

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“…As it was the L Hardjo serovar that was found it is more likely that the source of infection is cattle, in which this serovar is endemic 5,6 and which can be a constant source of contamination to the environment even when not showing positive in serological surveys 8,18 or alternatively it is sheep, in which it is also common 5 …”

Section: Discussionmentioning

confidence: 99%

Serological survey for evidence of Leptospira interrogans in free‐living platypuses (Ornithorhynchus anatinus)

et al. 2008

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The serological findings demonstrate that these animals are constantly exposed to infection with Leptospira in their environment, but it is not known if platypuses suffer from clinical leptospirosis or if they mount an immune response, but are unaffected by the bacteria. The prevalence of Leptospira infection among the platypus population could not be precisely estimated because of the unknown number of individuals inhabiting the Wollondilly River inside the survey property. Domestic livestock, mostly cattle, may be the major source of Leptospira infection. The effects of this disease on population dynamics and on reproduction in wild platypuses are not well understood. The role of other wildlife in the transmission and maintenance of Leptospira in the environment is unknown.

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“…It is often detected in patients involved in agricultural industries, as is serovar Hardjo, which was also frequently detected in human patients in Queensland. Serovar Hardjo also has a worldwide distribution and is primarily carried by cattle [47,[53][54][55][56]. Interestingly, serovar Australis, the most detected serovar in dogs, was only responsible for seven (6.5%) human cases of leptospirosis.…”

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 99%

Leptospirosis is an emerging infectious disease of pig-hunting dogs and humans in North Queensland

et al. 2022

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Background Leptospirosis is a zoonotic disease with a worldwide distribution, caused by pathogenic serovars in the genus Leptospira. Feral pigs are known carriers of Leptospira species and pig hunting using dogs is a common recreational activity in Queensland, Australia. Methodology and principal findings This study aimed to determine the seroprevalence of Leptospira spp. serovars in pig-hunting dogs above the Tropic of Capricorn in Queensland and by establishing the geographic distribution, serovars and incidence of human cases of leptospirosis in Queensland, identify potential overlap between human and canine exposure. We also explored the knowledge and risk-taking behaviours of pig-hunting dog owners towards zoonotic diseases. Ninety-eight pig-hunting dogs deemed healthy by physical examination and owned by 41 people from Queensland had serum submitted for Microscopic Agglutination Testing (MAT) to determine antibody titres against Leptospira serovars, while 40/41 dog owners completed a survey on their knowledge of diseases relating to pig hunting. Human leptospirosis cases (n = 330) notified to Queensland Health between 2015–2018 were analysed. Approximately one quarter (23/87; 26%) of unvaccinated pig-hunting dogs were seropositive to Leptospira spp. Although harder to interpret, 8/11 (73%) vaccinated dogs were seropositive to Leptospira spp. Pig hunters may be more likely to contract leptospirosis compared with the general Queensland population, based on responses from surveyed hunters. The highest concentration of human leptospirosis was in the wet tropics region of Far North Queensland. There was little overlap between the serovars dogs were exposed to and those infecting humans. The dominant serovar identified in unvaccinated dogs was Australis (13/23; 57%), with serovar Arborea (36/330; 10.9%) responsible for the highest number of human leptospirosis cases. Topaz was the second most common serovar in both humans and dogs and was previously unrecorded in Australian dogs. Most hunters surveyed used hand washing as a zoonotic disease risk reduction technique. Conclusions Leptospirosis is an emerging disease of growing significance. The infection requires a ‘one health’ approach to understand its epidemiology. With shifting climatic patterns influencing human-animal-environment interactions, ongoing monitoring of diseases like leptospirosis is critical to helping prevent infection of individuals and disease outbreaks.

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Leptospira Interrogans Serovar Hardjo Infection of Cattle

Cited by 15 publications

References 13 publications

A field study of the effects of a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine administered with oxytetracycline on reproductive performance in beef cattle

A field study of the effects of a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine administered with oxytetracycline on reproductive performance in beef cattle

Serological survey for evidence of Leptospira interrogans in free‐living platypuses (Ornithorhynchus anatinus)

Leptospirosis is an emerging infectious disease of pig-hunting dogs and humans in North Queensland

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