Colouring Agents for Use in Disc-antibiotic Sensitivity Tests

Colouring agents for use in disc-antibiotic sensitivity tests.

Antibiotic and Sulfonamide Disc Sensitivity Tests

Avian strains of Escherichia coli (213) were subjected to in vitro antibiotic sensitivity tests with twenty-four different chemotherapeutic agents. Chlorhexidine, polymyxin B, colistin, and nitrofurazone exhibited the greatest inhibitory activities against these strains. Various potencies of antibiotics were compared. The activity of sulfachloropyridazine on various types of media failed to sho...

Light-scattering methods for antibiotic sensitivity tests.

The total intensity of light scattered in the angular range 30 degrees-130 degrees by a suspension of bacteria can be used as the basis of a method of antibiotic sensitivity testing. A procedure is given in which the bacteria are incubated in the presence of antibiotic, as a test, and in its absence, as a control, for 60 minutes. An incubation time of 90 minutes gives slightly more reliable res...

Sensitivity tests for the polymyxins.

Although the value of polymyxins B and E in the treatment of infections with Gram-negative bacilli is well recognized, they are not usually used unless the causal organisms are insensitive to antibiotics with wider activity. In consequence, sensitivity tests for them are not common laboratory procedures and it is not generally appreciated that the usual methods are not entirely satisfactory. Ju...

Antibiotic sensitivity testing: correlations between in vitro tests in vivo situations.

This review discusses the correlations between in vitro antibiotic sensitivity test results and in vivo clinical situations. It is concluded that the relations between blood levels and minimal inhibitory concentrations of antibacterial drugs cannot always be applied as criteria of sensitivity. Important exceptions are local treatments and treatment of infections in body sites where antibiotics ...