Evidence that the high incidence of treatment failures in Indian kala-azar is due to the emergence of antimony-resistant strains of Leishmania donovani.
The possibility that the high frequency of treatment failures in Indian kala-azar might be due to infection with antimony-resistant strains of Leishmania donovani has not been experimentally addressed. L. donovani isolates were obtained from splenic aspiration smears of 24 patients in Bihar, India, who either did not respond (15) or did respond (9) to 1 or more full courses of treatment with sodium antimony gluconate (SAG). A strong correlation (P<.001) between clinical response and SAG sensitivity in vitro was observed only when strains were assayed as intracellular amastigotes: responsive isolates ED50=2.4+/-2.6, ED90=6.4+/-7.8 microgram SAG/mL; unresponsive isolates ED50=7.4+/-3.7 microgram SAG/mL, ED90=29.1+/-11.1 SAG/mL. No correlation with clinical response was found by use of extracellular promastigotes (ED50=48+/-22 vs. 52+/-29 microgram/mL). The emergence of antimony-resistant L. donovani strains appears to be a cause of treatment failures in India.
Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. rlira@nih.gov
R
R
Lira
S
S
Sundar
A
A
Makharia
R
R
Kenney
A
A
Gam
E
E
Saraiva
D
D
Sacks
D000293:Adolescent; D000328:Adult; D000818:Animals; D000967:Antimony Sodium Gluconate / Q000494:pharmacology* / Q000627:therapeutic use; D000981:Antiprotozoal Agents / Q000494:pharmacology* / Q000627:therapeutic use; D002648:Child; D004351:Drug Resistance; D005260:Female; D006801:Humans; D007194:India; D007893:Leishmania donovani / Q000187:drug effects* / Q000302:isolation & purification; D007898:Leishmaniasis, Visceral / Q000188:drug therapy* / Q000469:parasitology; D008297:Male; D008875:Middle Aged; D013154:Spleen / Q000469:parasitology; D017211:Treatment Failure
D000981:Antiprotozoal Agents; D000967:Antimony Sodium Gluconate