Prophylactic non-absorbable antibiotics in leukaemic patients.

A regimen of oral non-absorbable prophylactic antibiotics (kanamycin-vancomycin-nystatin) was given to nine severely neutropaenic leukaemic patients on cytotoxic therapy (11 courses), in conjunction with isolation procedures. An appreciable decrease in faecal organisms, especially anaerobes, was apparent after 48 h of commencing the course, and most bacteria had disappeared from the stool after five days. There were three episodes of septicaemia, all with enteric organisms, whilst on these antibiotics; one proved fatal. The emergence of resistance to aminoglycosides in faecal flora, notably Klebsiella, in 6/11 courses constituted a major problem in the use of such prophylaxis.