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JAMA. 1975 Jan 13;231(2):162-6.

Chloramphenicol-resistant Salmonella typhi in Saigon.


Chloramphenicol-resistant Salmonella typhi was detected in Saigon in September 1971. Subsequently, 163 strains of S typhi were isolated, 46 percent of which were resistant to choramphenicol by the agar-disk method. Sixty-two strains were studied by the broth-dilution method; 37 percent had minimal inhibitory concentrations for chloramphenicol greater than 250mug/ml, but all strains were susceptible to 0.4mug/ml of ampicillin and to a disk of a combination of trimethoprim and sulfamethoxazole (Bactrim). Persons infected with chloramphenicol-resistant strains of S typhi responded poorly to chloramphenicol alone, but ampicillin or the combination drug was effective.

[Indexed for MEDLINE]

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