Gene/Protein Disease Symptom Drug Enzyme Compound
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Sulbactam-ampicillin is a combination of sulbactam, a beta-lactamase inhibitor, and ampicillin, a broad spectrum beta-lactam antibiotic. The efficacy of sulbactam-ampicillin was evaluated in the treatment of neonatal calf diarrhoea under conditions where a major proportion of the calves were excreting enterobacteria which were resistant to beta-lactam antibiotics. In a series of six studies with a common experimental design, three treatments (sulbactam-ampicillin, ampicillin alone and untreated control) were compared in over 300 Friesian and Ayrshire calves aged between three and 10 days and of known immunological status as determined by their zinc sulphate turbidity values. A mortality rate of 26.4 per cent in the negative control calves was reduced to 14.0 per cent with ampicillin alone and 9.5 per cent with sulbactam-ampicillin. The probability of diarrhoea subsequent to initiation of treatment was reduced from 0.50 in the negative control calves to 0.44 with ampicillin alone and 0.35 with sulbactam-ampicillin. The differences in mortality and diarrhoea observed between the calves treated with sulbactam-ampicillin and the calves in each of the other treatment groups were statistically significant. The superior efficacy of sulbactam-ampicillin is explained by the inhibitory effect of sulbactam on the beta-lactamases produced by resistant bacteria, thus rendering them susceptible to the ampicillin in the combination.
Vet Rec 1987 Aug 22
PMID:Efficacy of sulbactam-ampicillin in the treatment of neonatal calf diarrhoea. 366 May 56

Sulbactam-ampicillin is a combination of sulbactam, a beta-lactamase inhibitor, and ampicillin, a broad spectrum beta-lactam antibiotic. The efficacy of sulbactam-ampicillin was evaluated in the treatment of calf respiratory disease associated with ampicillin-sensitive and ampicillin-resistant strains of Pasteurella haemolytica and Pasteurella multocida. Treatment with sulbactam-ampicillin was compared with treatment with ampicillin alone in 123 Friesian calves, between three and five weeks old, exhibiting clinical signs of respiratory disease. Seven of the 59 calves treated with ampicillin died whereas only one death occurred in the 64 calves treated with sulbactam-ampicillin. In the calves which survived, treatment with sulbactam-ampicillin resulted in a significantly better clinical response, as measured by the reduction in severity of clinical signs. The results of bacteriological examinations indicated that there was a marked increase in the proportion of ampicillin-resistant isolates of P haemolytica subsequent to treatment with ampicillin, whereas the proportion of ampicillin-resistant isolates of P. haemolytica recovered from calves treated with sulbactam-ampicillin had declined. The superior efficacy of sulbactam-ampicillin observed in this study is explained by the inhibitory effect of sulbactam on beta-lactamases produced by resistant bacteria, thus rendering them susceptible to the ampicillin.
Vet Rec 1987 Oct 24
PMID:The efficacy of sulbactam-ampicillin in the therapy of respiratory disease associated with ampicillin resistant Pasteurella species in housed calves. 368 2