Indomethacin-sensitive monocyte killing defect in a child with disseminated atypical mycobacterial disease.

A child with disseminated disease due to Mycobacterium avium had progressive disease in spite of 4.5 years of therapy with multiple antimicrobial agents selected on the basis of in vitro sensitivity testing of her organism. A defect in monocyte bactericidal activity was detected which was corrected in vitro by exposure of the patient's monocytes to indomethacin and normal serum. Indomethacin therapy resulted in normalization of monocyte bactericidal activity and striking, albeit temporary, clinical improvement.