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Antimicrobial Agents and Chemotherapy, October 1999, p. 2463-2467, Vol. 43, No. 10
Immunocompromised Host Section,
Received 7 April 1999/Returned for modification 3 June
1999/Accepted 28 July 1999
The activity of liposomal nystatin (L-Nys) against subacute
disseminated candidiasis was investigated in persistently neutropenic rabbits. Antifungal therapy was administered for 10 days starting 24 h after intravenous inoculation of 103
blastoconidia of Candida albicans. Responses to treatment
were assessed by the quantitative clearance of the organism from blood and tissues. Treatments consisted of L-Nys at dosages of 2 and 4 mg/kg
of body weight/day (L-Nys2 and L-Nys4, respectively) amphotericin B
deoxycholate at 1 mg/kg/day (D-AmB), and fluconazole at 10 mg/kg/day (Flu). All treatments were given intravenously once daily. Compared to
the results for untreated but infected control animals, treatment with
L-Nys2, L-Nys4, D-AmB, and Flu resulted in a significant clearance of
the residual burden of C. albicans from the kidney, liver,
spleen, lung, and brain (P < 0.0001 by analysis of
variance). When the proportion of animals infected at at least one of
the five tissue sites studied was evaluated, a dose-dependent response to treatment with L-Nys was found (P < 0.05).
Compared to D-AmB-treated rabbits, mean serum creatinine and blood urea
nitrogen levels at the end of therapy were significantly lower in
animals treated with L-Nys2 (P < 0.001) and L-Nys4
(P < 0.001 and P < 0.01, respectively). L-Nys was less nephrotoxic than conventional
amphotericin B and had dose-dependent activity comparable to that of
amphotericin B for the early treatment of subacute disseminated
candidiasis in persistently neutropenic rabbits.
0066-4804/99/$04.00+0
Safety and Efficacy of Multilamellar Liposomal
Nystatin against Disseminated Candidiasis in Persistently
Neutropenic Rabbits
*
Corresponding author. Mailing address:
Immunocompromised Host Section, Pediatric Oncology Branch, National
Cancer Institute, National Institutes of Health, Building 10, Rm.
13N240, 10, Center Dr., Bethesda, MD 20892. Phone: (301) 402-0023. Fax:
(301) 402-0575. E-mail: walsht{at}mail.nih.gov.
Antimicrobial Agents and Chemotherapy, October 1999, p. 2463-2467, Vol. 43, No. 10
0066-4804/99/$04.00+0
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