A controlled evaluation of albendazole against natural infections with Fasciola hepatica and Fascioloides magna in cattle     

N C Ronald  T M Craig  R R Bell 《American journal of veterinary research》1979,40(9):1299-1300

Albendazole administered to cattle at doses of 45, 35, 25, and 15 mg/kg of body weight reduced the number of viable Fasciola hepatica adults by 99.8%, 97.6%, 97.6%, and 95.7%, F hepatica immatures by 100%, 98.6%, 98.6% and 91.9% and Fascioloides magna by 96.5%, 99.1%, 94.0%, and 94.0%, respectively. Statistical evaluation by one-way analysis of variance, showed significant (P less than 0.05) differences in burdens of each fluke species between treated and untreated cattle, but differences in efficacy between any two of the four drug doses were not significant. Signs of toxicosis were not observed between the time of drug administration and slaughter 7 to 10 days later.  相似文献   

Effects of season and grass tetany on mineral composition of Hereford cattle hair     

R F Hall  W L Sanders  M C Bell  R A Reynolds 《American journal of veterinary research》1971,32(10):1613-1619

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Classification of cell types in vaginal smears during the canine oestrous cycle     

D W Christie  J B Bailey  E T Bell 《The British veterinary journal》1972,128(6):301-310

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Successful vaccination of lambs against infection with Taenia ovis using antigens produced during in vitro cultivation of the larval stages   总被引：1，自引：0，他引：1  

M D Rickard  K J Bell 《Research in veterinary science》1971,12(4):401-402

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Enigmatic resistance of sheep (Ovis aries) to infection by virulent Francisella tularensis.          下载免费PDF全文

J F Bell  S K Wikel  W W Hawkins    C R Owen 《Canadian journal of veterinary research》1978,42(3):310-315

Tularemia in range sheep is an occasional cause of severe economic loss from mortality and unthriftiness as well as a hazard to persons in contact with the animals. Epizootics are unpredictable and explosive, therefore, prophylaxis is more practical than therapy. Live vaccine of proven value in man and in beavers was inoculated into mature ewes and elicited antibodies without harm to the sheep. However, challenge of immunity was not possible because virulent Francisella tularensis in large doses did not cause significant mortality in healthy, well managed, unimmunized sheep. Evidence suggests that a complex of stresses such as inclement weather, lambing and concomitant ectoparasitism render sheep more susceptible to tularemia.  相似文献   

Ulceration of the ileum, and giardiasis in a Beagle     

D W Christie  R S Anderson  E T Bell  G L Gallagher 《The Veterinary record》1971,88(8):214-215

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The evaluation of cellular indices in canine vaginal cytology     

E T Bell  D W Christie 《The British veterinary journal》1971,127(12):Suppl:63-Suppl:65

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Relationship between incidence of gastric dilatation-volvulus and biometeorologic events in a population of military working dogs     

Herbold JR  Moore GE  Gosch TL  Bell BS 《American journal of veterinary research》2002,63(1):47-52

OBJECTIVE: To calculate the monthly incidence of gastric dilatation-volvulus (GDV) in a population of military working dogs during a 5-year period and determine whether there was an association with synoptic climatologic indices. SAMPLE POPULATION: Medical records of all military working dogs housed at Lackland Air Force Base,Tex, from Jan 1, 1993 to Dec 31, 1997. PROCEDURE: Confirmed cases of GDV were identified from evaluation of medical records and used to calculate incidence of GDV. Factor analysis of local climatologic data was used to classify each day into 1 of 8 meteorologically homogeneous types of days for this location. Occurrence of GDV was compared with frequency of occurrence of synoptic climatologic days. RESULTS: 48 cases of GDV were identified from January 1993 through December 1997 Mean monthly incidence was 2.5 cases/1,000 dogs at risk (range, 0 to 18.5 cases/1,000 dogs; median, 2.5 cases/1,000 dogs). A seasonal increase in incidence of GDV was detected, because half of the episodes were during November, December, and January. An association with a specific synoptic climatologic day was not detected. CONCLUSIONS AND CLINICAL RELEVANCE: Seasonal fluctuations in incidence of GDV may be associated with external factors that precipitate physiologic changes resulting in GDV. Although a specific cause-effect relationship was not documented, clinicians must be alert for the potential of seasonal variation in incidence of GDV and accordingly heighten their index of suspicion for the condition, particularly in populations of dogs that are predisposed to development of GDV.  相似文献   

rep-PCR-Mediated Genomic Fingerprinting: A Rapid and Effective Method to Identify Clavibacter michiganensis   总被引：1，自引：0，他引：1  

Louws FJ  Bell J  Medina-Mora CM  Smart CD  Opgenorth D  Ishimaru CA  Hausbeck MK  de Bruijn FJ  Fulbright DW 《Phytopathology》1998,88(8):862-868

ABSTRACT The genomic DNA fingerprinting technique known as repetitive-sequence-based polymerase chain reaction (rep-PCR) was evaluated as a tool to differentiate subspecies of Clavibacter michiganensis, with special emphasis on C. michiganensis subsp. michiganensis, the pathogen responsible for bacterial canker of tomato. DNA primers (REP, ERIC, and BOX), corresponding to conserved repetitive element motifs in the genomes of diverse bacterial species, were used to generate genomic fingerprints of C. michiganensis subsp. michiganensis, C. michiganensis subsp. sepedonicus, C. michiganensis subsp. nebraskensis, C. michiganensis subsp. tessellarius, and C. michiganensis subsp. insidiosum. The rep-PCR-generated patterns of DNA fragments observed after agarose gel electrophoresis support the current division of C. michiganensis into five subspecies. In addition, the rep-PCR fingerprints identified at least four types (A, B, C, and D) within C. michiganensis subsp. michiganensis based on limited DNA polymorphisms; the ability to differentiate individual strains may be of potential use in studies on the epidemiology and host-pathogen interactions of this organism. In addition, we have recovered from diseased tomato plants a relatively large number of naturally occurring avirulent C. michiganensis subsp. michiganensis strains with rep-PCR fingerprints identical to those of virulent C. michiganensis subsp. michiganensis strains.  相似文献   

A controlled vaccination trial for Newcastle disease under village conditions     

J. G. Bell  D. Ait Belarbi  A. Amara 《Preventive veterinary medicine》1990,9(4):295-300

All the poultry in each of four distinct Moroccan villages were vaccinated against Newcastle disease using Hitchner B1 and inactivated vaccines. Poultry in a fifth village were monitored as controls. Mortality in the poultry was followed for 20 weeks after the first vaccination and blood samples were taken every 4 weeks from chickens for estimation of antibodies against Newcastle disease virus. Sixty-three percent of the chicken population and 60% of the turkey population in the control village died during the 20 weeks of observation. Necropsied birds showed lesions consistent with Newcastle disease. Mortality did not exceed 22% in the vaccinated villages.  相似文献