Chao, C C Serum neopterin and interleukin-6 levels in chronic fatigue syndrome. [electronic resource] - The Journal of infectious diseases Dec 1990 - 1412-3 p. digital Publication Type: Letter ISSN: 0022-1899 Standard No.: 10.1093/infdis/162.6.1412-a doi Subjects--Topical Terms: AdultBiopterins--analogs & derivativesFatigue Syndrome, Chronic--bloodFemaleHumansInterleukin-6--bloodMaleNeopterin