Patients with inherited defects in the interleukin-12 (IL-12)-dependent, 'h
igh-output' interferon-gamma (IFN-gamma) pathway exhibit selective suscepti
bility to poorly pathogenic mycobacterial and salmonella infections. This r
eview summarises the extended clinical spectrum seen in this group of patie
nts and indicates a strategy for the identification of putative defects in
the type 1 cytokine pathway. (C) 2000 Editions scientifiques et medicales E
lsevier SAS.