Calf Pneumonia Research Articles

The Isolation of Mycoplasma from Bovine Lungs and Nasal Swabs

SUMMARY Mycoplasma were isolated from the lungs of 10 calves suffering from pneumonia and similar organisms were recovered from 46 nasal swabs taken from animals suffering from a respiratory infection. By means of complement fixation, agglutination, growth inhibition and fluorescent antibody techniques, the strains were classified into 2 distinct groups. The majority (group A) consisting of both lung and nasal isolates, belonged to an unknown serotype; the rest (group B), consisting only of nasal strains, had the characters of Mycoplasma laidlawii. Serological examinations of paired bovine serum samples showed that somewhat higher agglutinating antibody titres against the unknown Mycoplasma were present in animals from 2 farms, where this strain of Mycoplasma had been recovered, than from a farm where the organism was not isolated. No complement fixing antibodies against this Mycoplasma were detected in any of the animals. The significance of these results is discussed in relation to the question of the possible role of the unidentified Mycoplasma in the aetiology of calf pneumonia.

Identification, au microscope électronique, d’un Myxovirus isolé d’une lésion de pneumonie du veau

Identification, au microscope électronique, d’un Myxovirus isolé d’une lésion de pneumonie du veau

Atypical pneumonia in calves.

The Journal of Pathology and BacteriologyVolume 67, Issue 2 p. 441-454 Article Atypical pneumonia in calves W. F. H. Jarrett, W. F. H. Jarrett Departments of Pathology (Western Infirmary) and Veterinary Pathology of the University of GlasgowSearch for more papers by this author W. F. H. Jarrett, W. F. H. Jarrett Departments of Pathology (Western Infirmary) and Veterinary Pathology of the University of GlasgowSearch for more papers by this author First published: April 1954 https://doi.org/10.1002/path.1700670219Citations: 15AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume67, Issue2April 1954Pages 441-454 RelatedInformation

The Isolation and Cultural Characteristics of an Organism of the Haemophilus Group in Calf Pneumonia

The isolation, growth characteristics and biochemical reactions of an organism of the Haemophilus group, isolated from calves affected with pneumonia, is described. The induction of pneumonia in a calf by nasal instillation of the Haemophilus in combination with a filterable agent from pnnumonic calf lung after serial passage in mice is discussed. It is suggested that the evidence points to-the presence of a virus aetiology in some outbreaks of calf pneumonia.

Observations on the L-Organism of Klieneberger

The streptobacillus moniliformis, under various names, has been reported to occur in rats in pulmonary disease,, , otitis media, and as inhabitant of the nasopharynx; in mice, as an agent of systemic disease;, , in humans, in fevers following the bite of rats or other small animals, or as an epidemic or isolated infection of variable transmission. A similar organism has been observed by Smith in pneumonia of calves. All organisms described in the above reports are characterized morphologically by huge bulbous or club-like swellings, which appear early in a developing culture, and later make up a large part of it. These swollen forms gained great theoretical importance when Klieneberger observed that they really represent an organism separate from the bacillus, which could be cultivated and grown alone, showing no reversion to bacillary forms in the 2 years of observation. Furthermore, the properties of this organism (designated “L” by Klieneberger) differ in many respects from those of bacteria and fungi, and resemble the curious organisms of pleuropneumonia bovis and of agalactia. The L-or-ganism being very soft and fragile, its real form is difficult to ascertain. It is known, however, to be very pleomorphic, exhibiting large disc-like forms, small filter-passing granules, and filaments of greatly varying size. Thus we have an entirely new type of observation before us: The cultures of a bacillus causing disease both in animals and in man appear to consist of 2 organisms, one of which shows properties associating it with organisms usually classed with the filtrable viruses. Recently Klieneberger has found that the pleuropneumonia-like organism is frequently found alone, without the bacillus, in the lung-abscesses of rats. In contrast, however, all observations indicate that the streptobacillus cannot be freed of the characteristic swollen forms of the L-organism.

Infectious Pneumonia of Calves

Infectious Pneumonia of Calves

Cases: Septic Pneumonia of Calves

Cases: Septic Pneumonia of Calves