This report is concerned with the sensitivity pattern to various antibiotics of a number of bacteria commonly encountered in the routine bacteriology laboratory. These micro-organisms, totaling 784, were isolated from various clinical sources over a 9-month period during 1959 and 1960. All of the specimens were submitted because of known or suspected infection.
An attempt has been made to correlate the sensitivity pattern of some of the strains with their source. The importance of the concentration of the antibiotic used in determining the sensitivity pattern of a specific organism is also emphasized.
Materials and Methods
All of the organisms were obtained from specimens routinely submitted by various clinical services.Following recent recommendations5 no attempt was made to differentiate Staphylococcus into var. albus and var. aureus. The coagulase test was performed with a commercially obtained lyophilized product.* The type of hemolysis of Streptococcus was based on the surface appearance on