Experimental production of bovine pneumonic pasteurellosis   总被引：1，自引：0，他引：1  

H A Gibbs  E M Allan  A Wiseman  I E Selman 《Research in veterinary science》1984,37(2):154-166

Pneumonic pasteurellosis has been reproduced in conventional, weaned, Friesian-cross calves using a strain of Pasteurella haemolytica biotype A, serotype 1 (P haemolytica A1) isolated from a pathologically confirmed incident of bovine pneumonic pasteurellosis. The major clinical findings were pyrexia, hyperpnoea, tachypnoea, nasal discharge and reduced appetite. Fibrinous pneumonia was present in the lungs of animals at necropsy on days 2 and 3 after initial infection while by days 9 and 10 after initial infection many of the areas of fibrinous pneumonia were confined by a fibrous capsule forming well defined nodules. During the experiment natural transmission of the infecting strain of P haemolytica A1 occurred in two control calves which developed a condition identical to that in the artificially infected calves. P haemolytica A1 was repeatedly recovered from the nasopharynx of infected calves and at necropsy throughout the upper and lower respiratory tracts. Seroconversion, as measured by indirect haemagglutination, to the organism developed in all infected calves by days 9 and 10 after initial infection. The clinical, microbiological and pathological findings were identical to those seen in field incidents of bovine pneumonic pasteurellosis involving recently housed, weaned, single-suckled calves.  相似文献   

Characterization of Escherichia coli isolated from cases of avian colibacillosis.   总被引：6，自引：1，他引：5       下载免费PDF全文

B J Allan  J V van den Hurk    A A Potter 《Canadian journal of veterinary research》1993,57(3):146-151

Forty-four western Canadian isolates of Escherichia coli associated with colibacillosis of turkeys and chickens were examined for serotype, antibiotic resistance, and production of aerobactin. The isolates belonged to fourteen O serogroups, with 39% of the strains being non-typeable. A high frequency of resistance to tetracycline, kanamycin, neomycin, cephalothin, streptomycin and erythromycin was observed. Most isolates produced aerobactin. Ten E. coli belonging to serogroups O1, O2 and O78 were also examined for pili production, hemagglutination, serum sensitivity, production of iron-regulated outer membrane proteins (IROMPS), and virulence. All isolates examined produced pili, exhibited mannose-sensitive hemagglutination of avian red blood cells and produced IROMPS under iron-restricted growth conditions. The five isolates of serogroup O1 and O2 were resistant to killing by turkey serum and were highly virulent. Only two of the five isolates of serogroup O78 were serum resistant. No correlation between serum resistance and virulence was observed in serogroup O78.  相似文献   

Osteochondral lesion and cranial cruciate ligament rupture in an immature dog stifle     

G. C. Macpherson  G. S. Allan 《The Journal of small animal practice》1993,34(7):350-353

An osteochondral flap was present on the medial femoral condyle of a stifle of a six-month-old female rottweiler in which there was also a ruptured cranial cruciate ligament. The lesion was probably osteochondritis dissecans, but the possibilities of it being secondary to joint in-stability or a subchondral fracture, as has been described in people with knee ligamentous injuries, are discussed.  相似文献   

Infectious bovine rhinotrancheitis.     

A Wiseman  I E Selman  P M Msolla  H M Pirie  E M Allan 《The Veterinary record》1979,104(2):40-41

  相似文献   

ERYTHROCYTE APLASIA IN A DOG     

A D Watson  B C Duff  G S Allan 《Australian veterinary journal》1975,51(2):94-96

Erythrocyte aplasia was diagnosed in a 6-year-old dog which had severe non-regenerative anaemia with depletion of erythroid cells in the bone marrow but normal production of granulocytes and platelets. Treatment with blood transfusions, testosterone and dexamethasone was unsuccessful. The dog died 46 days after initial examination as a result of anaemia, transfusion reactions, and toxaemia from an ascending urinary tract infection.  相似文献   

Cholecystography in the Dog: The Choice of Contrast Media and Optimum Dose Rates     

Graeme S.  Allan Richard T.  Dixon 《Veterinary radiology & ultrasound》1975,16(3):98-104

  相似文献   

The pathogenicity of four avian influenza viruses for fowls, turkeys and ducks   总被引：1，自引：0，他引：1  

D J Alexander  W H Allan  D G Parsons  G Parsons 《Research in veterinary science》1978,24(2):242-247

Groups of 10 two-week-old chicks, turkey poults and ducklings were each infected by the intranasal route with one of four avian influenza viruses: a/fowl/Germany/34 (Hav 1N))--Rostock, A/FPV/Dutch/27 (Hav 1 Neq 1)--Dutch, A/fowl/Victoria/75 (Hav 1 Neq 1)--Australian, and A/parrot/Ulster/73 (Hav 1 N1)--Ulster. Eight hours after infection 10 birds of the same age and species were placed in contact with each group and allowed to mix. The clinical signs of disease and onset of sickness and death were recorded. Ulster virus was completely avirulent for all birds. Rostock, Dutch and Australian viruses were virulent for fowls and turkeys causing death in all birds with the exception of 3/10 in contact fowls from the Rostock virus group and 2/10 in contact fowls from the Australian virus group. Only Rostock virus caused sicked sickness or death in ducks, 9/10 intranasally infected and 6/7 in contact birds showed clinical signs and 2/10 intranasally infected and 3/7 in contact ducks died. Intranasal and in contact pathogenicity indices were calculated for each virus in each bird species and indicated quantitatively the differences in virulence of the four virus strains. Virus isolation and immune response studies indicated that surviving in contact fowls in the Rostock virus group had never been infected but that surviving Australian virus in contact fowls had recovered from infection. Infection was not established in Ulster virus in contact fowls and Australian virus intranasally infected and in contact ducks. The birds in all other groups showed positive virus isolations and a high incidence of positive immune response. The last virus isolation was made at 22 days after intranasal infection of ducks with Ulster virus.  相似文献   

The degradation of methazole in soil. II. Studies with methazole,methazole degradation products and diuron     

Allan Walker  Michael G. Roberts 《Pest management science》1978,9(4):333-341

[¹⁴C]-Labelled methazole, 1-(3,4-dichlorophenyl)-3-methylurea (DCPMU), 1-(3,4-dichlorophenyl)urea (DCPU), and diuron were incubated in soil at 20°C and field capacity soil moisture content. Decomposition followed first-order kinetics; half-lives for degradation of these four compounds were 2.4, 144, 30 and 108 days respectively. The amount of DCPMU and DCPU that could be extracted decreased with time and the decrease was accompanied by the generation of an equivalent amount of ¹⁴CO₂. This was not so in the studies with diuron and methazole, however, and the decrease in the concentrations of radioactivity extracted from soil treated with these compounds could not be entirely accounted for as carbon dioxide. It is concluded that the unextractable radiochemical that was present was DCPMU. Methazole appeared to be degraded through DCPMU to 3,4-dichloroaniline (DCA) with the production of only traces of DCPU.  相似文献   

An acute severe outbreak of infectious bovine rhinotracheitis: clinical, epidemiological, microbiological and pathological aspects.     

A Wiseman  P M Msolla  I E Selman  E M Allan  H J Cornwell  H M Pirie  W S Imray 《The Veterinary record》1978,103(18):391-397

  相似文献   

Dyserythropoiesis, Polymyopathy, and Cardiac Disease in Three Related English Springer Spaniels   总被引：2，自引：1，他引：1  

Christopher T. Holland BVSc    Paul J. Canfield BVSc  PhD    A. David J. Watson BVSc  PhD  Graeme S. Allan MVSc 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1991,5(3):151-159

A polysystemic disorder was observed in three related English Springer Spaniel dogs that demonstrated regurgitation from an early age, slowly progressive temporal muscle atrophy with partial trismus, and less pronounced generalized skeletal muscle atrophy. All dogs exhibited moderate dyserythropoietic anemia, polymyopathy with megaesophagus, and varying degrees of cardiomegaly. The prevalence, etiology, underlying pathomechanism, and possible mode of inheritance remain to be elucidated.  相似文献