Vaccination of the brushtail possum (Trichosurus vulpecula) against Mycobacterium bovis infection with bacille Calmette-Guérin: the response to multiple doses.     

L A L Corner  B M Buddle  D U Pfeiffer  R S Morris 《Veterinary microbiology》2002,84(4):327-336

In New Zealand, the brushtail possum (Trichosurus vulpecula) is the principal wildlife vector of bovine tuberculosis. Control of infected possum populations contributes to the control of tuberculosis in domestic livestock. Vaccination is potentially a complementary strategy to population control, but to be cost-effective, administration of the vaccine to possums would need to be from an appropriately designed automatic vaccinator. Possums themselves would activate the vaccinator so that it would deliver an aerosol spray of vaccine. There would be no direct way to prevent possums receiving multiple doses of vaccine. This study examined the effect on protective immunity of repeated vaccination. Captive possums were vaccinated with BCG strain pasteur 1173P2 either 12 times at weekly intervals, twice at 6-weekly intervals, or once. Vaccination was by a combination of intranasal aerosol and conjunctival instillation. Eight weeks after the last dose of vaccine, all possums were challenged intratracheally with Mycobacterium bovis strain 83/6235. Vaccination induced a significant immune response as measured by the lymphocyte proliferation assay (LPA). A significant level of protection, as measured by the response to challenge, developed in all the vaccinated possum groups, but protection was greatest in the group vaccinated 12 times. It was concluded that protection would be enhanced if vaccinations were repeated at short intervals (weekly), but no benefit or detriment resulted from revaccination after longer intervals (1-2 months).  相似文献   

A serological study of leptospirosis in domestic deer in New Zealand     

Flint SH  Corner RJ  Marshall RB 《New Zealand veterinary journal》1988,36(3):151-152

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Managing soil quality for humanity and the planet     

Rattan LAL 《农业科学与工程前沿(英文版)》2020,7(3):251-253

Rather than a human-centric, the basic strategy of achieving Sustainable Development Goals must be focused on restoring and sustaining planetary processes. The urgency of meeting the demands of the humanity must be reconciled with the necessity of enhancing the environment. Increasing and restoring soil organic matter content of the degraded and depleted soils is critical to strengthening planetary processes.  相似文献   

Some Observations on the Diagnosis and Epidemiology of Leptospirosis in Swine   总被引：2，自引：0，他引：2       下载免费PDF全文

D. Mitchell  A. Robertson  A. H. Corner    P. Boulanger 《Canadian journal of veterinary research》1966,30(8):211-217

The results of combined epidemiological, clinical, serological, bacteriological and histopathological studies following an outbreak of disease caused by L. pomona on a farm stocked with cattle, sheep, pigs, goats and horses maintained for experimental purposes, are reported.

The incidence of infection was high in horses, cattle and pigs. A few low titres were seen in sheep. The goats were not infected. Apart from a single bovine abortion all the clinical symptoms observed occurred in pregnant sows. Seven of these aborted or gave birth to stillborn pigs within a six week period.

Fifteen species of wildlife were trapped or shot on the farm during the year following the outbreak. L. pomona was isolated from four skunks and a porcupine. Epidemiological studies indicated that wildlife reservoir hosts were the primary source of infection for the domestic livestock.

Leptospiruria and the serological response were studied in a group of eight infected sows. Microscopic agglutination titres of 10² or less could not be associated with leptospiruria and the duration of leptospiruria was found to range from a few weeks to over two years in individual sows. Direct dark-field examination of urine proved superior to guinea-pig inoculation as a method of detecting leptospiruria and it is suggested that the former technique could be adopted with advantage as a routine aid to diagnosis.

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A Histological Study of the Effects of Enzootic Abortion of Ewes Virus in the Lactating Bovine Mammary Gland   总被引：1，自引：0，他引：1       下载免费PDF全文

A. H. Corner  G. L. Bannister    D. P. Hill 《Canadian journal of veterinary research》1968,32(1):372-381

Inoculation of the udders of cows with the virus of enzootic abortion of ewes resulted in a severe acute mastitis. The mastitis was characterized clinically by pyrexia, anorexia, decreased milk production, swelling and marked alteration in the physical quality of the milk. The basic lesion was necrosis of alveolar and duct epithelial cells. Virus particles were demonstrated in all levels of the mammary gland three days after inoculation illustrating the rapid spread of the agent. Cells resembling Reed-Sternberg cells and similar to those seen in experimental mastitis produced by the virus of infectious bovine rhinotracheitis were seen in tissues collected six and nine days after inoculation.  相似文献   

History and epizootiology of rabies in Canada.   总被引：8，自引：5，他引：3       下载免费PDF全文

H Tabel  A H Corner  W A Webster    C A Casey 《The Canadian veterinary journal. La revue veterinaire canadienne》1974,15(10):271-281

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Electrophoretic and Chemical Studies on Sera of Swine Following the Feeding of Toxic Groundnut Meal   总被引：1，自引：1，他引：0       下载免费PDF全文

E. Annau  A. H. Corner  S. E. Magwood    K. Jericho 《Canadian journal of veterinary research》1964,28(11):264-268,269

The consumption of toxic groundnut meal by swine leads to marked alterations in their electrophoretic serum patterns. Experiments carried out by chemical assays and by the moving boundary electrophoretic method of Tiselius and Smithies' starch gel electrophoresis showed a relative decrease in the albumin, alpha₁-, alpha₂-, and beta globulins, while gamma globulin appeared to be considerably increased.  相似文献   

罗氏沼虾繁殖习性的研究   总被引：5，自引：0，他引：5  

赵云龙  堵南山 《水产科技情报》1995,22(4):147-149

本文对罗氏沼虾的繁殖习性进行了较为详细地描述。性成熟的雌虾必须经过生殖蜕皮方可交配、产卵；受精卵粘附于腹肢刚毛上；在水温２４℃左右的条件下，幼体孵出约需２７天；性成熟雌虾能多次产卵。  相似文献   

THE OVARIAN CYCLE OF SWINE     

Corner GW 《Science (New York, N.Y.)》1921,53(1374):420-421

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Distribution of Brucella abortus in infected cattle   总被引：1，自引：0，他引：1  

L A Corner  G G Alton  H Iyer 《Australian veterinary journal》1987,64(8):241-244

Experimentally and naturally infected cattle were examined bacteriologically to determine the anatomical distribution of specimens yielding Brucella abortus. In 91 experimentally infected pregnant cows, examined 3 to 4.5 months after conjunctival challenge during pregnancy, the most frequently infected specimen was the mammary (syn. supramammary) lymph node. All experimentally infected cows could be identified from cultures of the mammary, mandibular (syn. submaxillary), medial iliac, caudal superficial cervical (syn. prescapular) lymph nodes and uterine caruncles, cotyledons or foetal tissues. Forty-six naturally infected cows were examined and again the most frequently infected specimen was the mammary lymph node. All naturally infected cows could be identified from cultures of the mammary, parotid, mandibular and subiliac (syn. prefemoral) lymph nodes. The distribution of infected specimens was somewhat different in heifers. In 61 naturally infected heifers the most frequently infected specimen was the mandibular lymph node but 8 other specimens would have been required to enable identification of all infected heifers. Specimens from 3 infected bulls were cultured and 11 of the 12 specimens examined were infected in at least one of the bulls. The most frequently infected tissues were the mandibular, caudal superficial cervical, subiliac and scrotal lymph nodes. The results suggest which specimens should be selected for culture, particularly when only a limited amount of effort can be expended.  相似文献