Correlation of the results of antibiotic synergy and susceptibility testing in vitro with results in experimental mouse infections.

Recent clinical isolates (approximately 150 strains) of the family Enterobacteriaceae were examined by agar diffusion, microdilution, and the Autobac automated system for their responses to beta-lactam antibiotics singly and in combination with amdinocillin (formerly called mecillinam). The ratio of ampicillin, carbenicillin, and cephalothin to amdinocillin was maintained at a 10:1 ratio in most of the evaluations. The same isolates were studied in mice challenged with 100 to 1000 LD50s and treated with graded doses of the antibiotics singly and in combination.

Chemotherapeutic activity of 5-fluorocytosine and amphotericin B against Candida albicans in mice.

The effect of treatment with combinations of the two antifungal agents, 5-fluorocytosine (5-FC) and amphotericin B (AB), against systemic Candida albicans infections in mice was investigated. Graded doses of the single substances and of combinations of the drugs were administered daily for 21 days. The 50% curative dose (CD(50)) values were calculated on the basis of the presence or absence of C.