Abstract:
:Of 2458 isolates of Haemophilus influenzae examined in a recent British survey, 42 were resistant to chloramphenicol. Two resistant isolates were of type b and 40 were non-capsulate. Spectrophotometric assay showed that all the resistant isolates produced chloramphenicol acetyltransferase (CAT). CAT activity did not increase following growth on heated blood agar containing chloramphenicol 2 mg/L but was reduced by 84-98% when extracts were treated for 30 min with 5', 5'-dithiobis-2-nitrobenzoate. These data suggest that H. influenzae CATs resemble the Type-II CATs produced by enterobacteria. Extrachromosomal DNA was detected in five only of the 42 resistant isolates and cured derivatives of two plasmid-containing strains retained their chloramphenicol resistance. These results suggest that the CAT gene is located on the chromosome.
journal_name
J Med Microbioljournal_title
Journal of medical microbiologyauthors
Powell M,Livermore DMdoi
10.1099/00222615-27-2-89subject
Has Abstractpub_date
1988-10-01 00:00:00pages
89-93issue
2eissn
0022-2615issn
1473-5644journal_volume
27pub_type
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