The ROB-1 beta-lactamase, previously described in Haemophilus influenzae, has been found in the genus Pasteurella. In three bovine strains of Pasteurella multocida and Pasteurella haemolytica, ROB-1 production was determined by plasmids of 4.4 kilobases. In one porcine strain of Pasteurella aerogenes, the enzyme seems to be chromosomally encoded.
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Livrelli et al. (1988) studied this question.
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