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Experimentally induced mastitis caused by bacillus cereus in cattle



Experimentally induced mastitis caused by bacillus cereus in cattle



Magyar Allatorvosok Lapja 40(10): 609-613



Different quantities of the pure culture of Bacillus cereus were inoculated intracysternally into experimental cows. Symptoms of toxicosis developed after inoculation that ceased within 24 hours, meanwhile an acute parenchymatous mastitis developed in the affected udder quarter. The cell counts and chloride ionic concentrations increased in the milk and its consistency changed considerably (appearance of mucus, flakes and clots). Later on, the affected udder quarter gradually underwent atrophy then the secretion ceased. Bacteria could be demonstrated in decreasing quantities in the affected quarters, generally up to one week after infection. Repeated bacteriological examinations of the blood of infected animals proved to be negative during the whole experiment. The rabbit test, as well as the inoculation of guinea pigs confirmed unequivocally that bacterial toxins present both in the milk and blood were responsible for the acute clinical symptoms. Results of examinations carried out in four infected cows 24 hours before and after inoculation are shown in Tables 1 and 3. Cell counts of two infected cows are given in Table 2. Plotted against the dose of inocula, changes of the body temperature are illustrated in Fig. 1, while Fig. 2 shows the trend in the number of B. cereus colonies. Histological examination of biopsy specimens collected one week after infection revealed vacuolar degeneration in the alveolar epithelium, cellular exudation in the glandular lumen and ducts, oedema and infiltration by neutrophilic granulocytes in the interstice (Figs 1 and 2).

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Accession: 005428208

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