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The humoral immune responses of 69 active tuberculosis (TB) patients against three major mycobacterial lipid antigens, monoacyl phosphatidylinositol dimannoside (Ac-PIM 2 ), trehalose 6,6′-dimycolate (TDM-T) and trehalose 6-monomycolate (TMM-T) from  Mycobacterium bovis  BCG Tokyo 172, were examined by ELISA. IgG antibodies from active TB patients were reactive against each of the three lipid antigens (Ac-PIM 2 , TDM-T and TMM-T), giving positive results of 42.0–59.4%. If tests were combined and an overall positive was scored when any of the three tests was positive, sensitivity was 71.0%, showing better discrimination between patients and normal subjects. Although this value is not satisfactory for the clinical diagnosis of active TB, it is still higher than values for Determinar TBGL (56.5%) and MycoDot (31.9%) test results, both of which are commercially available. IgG antibody responses to particular lipid antigens in an individual patient differed diversely between patients. Positive IgG antibody rates and IgG antibody levels to lipid antigens were mostly paralleled by the amount of mycobacteria excreted and by the severity of pathological lesions (size and cavity formation). Serologically positive responsiveness was shown in 60.0% of tuberculin skin test (TST)-negative TB patients. Furthermore, seropositivity for multiple-antigen ELISA in active TB patients was demonstrated in other possible immune-suppressed cases, such as senile, diabetes mellitus and fulminant TB patients. Therefore, in contrast to tests based on cellular immune responses such as the TST, the humoral immune responses of TB patients against mycobacterial lipid antigens were disease-specific and were shown to be useful for the early diagnosis of active TB disease in conjunction with smear and cultivation tests, even if cellular immune responses are decreased.

Clinical evaluation of serodiagnosis of active tuberculosis by multiple-antigen ELISA using lipids from Mycobacterium bovis BCG Tokyo 172