experimental infection of weaned calves and lambs with two strains of bovine adenovirus type 2.the pathogenicity of two genetically different strains of bovine adenovirus type 2 (bav-2) was tested in a double cross experimental infection of weaned lambs and calves. one of the virus strains was isolated from cattle and represented bav-2 subgroup "a", while the other was isolated from sheep and belonged to subgroup "b" (belák et al., 1983). the two virus strains caused infection both in lambs and calves; the viruses were repeatedly reisolated and definite seroconversion was found in all fou ...19938391744
pasteurella haemolytica complicated respiratory infections in sheep and goats.respiratory infections which commonly occur in sheep and goats often result from adverse physical and physiological stress combined with viral and bacterial infections. inevitably, pasteurella haemolytica pneumonia occurs as a result of these interactions. in this review, we present recent advances in research on the complex etiology of pneumonia involving p. haemolytica. initially stress, induced by factors such as heat, overcrowding, exposure to inclement weather, poor ventilation, handling an ...19989689740
dna sequencing and phylogenetic analysis of the protease gene of ovine adenovirus 3 suggest that adenoviruses of sheep belong to two different genera.until now, the only published ovine adenovirus dna sequence was the complete genome of ovine adenovirus isolate 287 (oav287) which, compared to other mammalian adenoviruses, possesses strikingly unique genomic organisation and should properly be classified into a new adenovirus genus. the protease gene sequence of ovine adenovirus type 3 (oadv-3) was determined and analysed. the results of phylogenetic analysis of the 205 residue long protein demonstrated that oadv-3 belongs to the genus mastade ...200010653919
occurrence of some viruses and bacteria involved in respiratory diseases of ruminants in hungary.serological surveys, virological and bacteriological investigations were carried out on large populations of lambs and calves kept in intensive fattening units on hungarian large-scale farms, in order to study the occurrence of viruses and bacteria involved in the respiratory disease complex. the investigations were carried out in stocks where 5-20% of the young animals succumbed to acute or chronic pneumonia every year. serological surveys revealed that seropositivity to bovine adenovirus type ...19989713141
dna structure, and hemagglutination properties of bovine adenovirus type 2 strains which bypass species specificity.bovine adenovirus type 2 (ad bos 2) strains were examined which had been isolated during natural outbreaks among calves, and lambs in hungary [belák, s., pálfi, v.: arch. ges. virusforsch. 46,366-369 (1974)]. differences were detected in hemagglutination properties, and in the restriction site maps of the dna, which seem to be sufficient to group isolates of ad bos 2 into two subtypes (subspecies). some of the strains, recovered from cattle including prototype strain no. 19 are suggested to be s ...19836314935
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