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The katG gene and the inhA gene of 30 INH-resistant (INH-R) and 28 INH-sensitive (INH-S) isolates ofM. tuberculosisfrom Haiti and Maryland were analysed by PCR to establish the presence and frequency of two postulated mechanisms of INH-resistance, total katG gene deletion and inhA Ser 94 to Ala 94 amino acid substitution. Only two of 30 INH-R isolates (3%) appear to have...
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