Antibiotic Susceptibility of Staphylococcus aureus in Saigon, South Vietnam
Methicillin resistant staphylococci are unevenly distributed throughout the world; the explanation for this is not known. During a survey of local hospitals for methicillin resistance, a number of strains from South Vietnam became available for study. Tests were performed in microtiter plates using various concentrations of several antibiotics with a final concentration of organisms of 105/ml and 108/ml. With the larger number of organisms in the inoculum, 17% of strains required 12.5 µg/ml or more of methicillin for inhibition. This is in contrast to a very low percentage of methicillin resistant staphylococci from local sources encountered in our laboratory. An unexpected finding was the occurrence of considerable lincomycin resistance in staphylococci from South Vietnam.