An 11-year-old hematopoietic stem cell transplant recipient develops chronic watery diarrhea and weight loss. Stool studies are negative for common pathogens. Special staining of a stool sample reveals very small (1-5 µm) spores. The infection is identified as Enterocytozoon bieneusi. What is the expected efficacy of albendazole for this specific species of microsporidia?