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. Author manuscript; available in PMC: 2017 Feb 19.
Published in final edited form as: Int J Tuberc Lung Dis. 2015 Jul;19(7):792–798. doi: 10.5588/ijtld.14.0878

Figure A.

Figure A

Change in magnitude of IFN-γ response in women who were negative at P32 and IGRA-positive at M12. The horizontal black dashed line represents 6 SFC/well, the manufacturer-defined cut-off point for a positive response. The horizontal black solid line represents 7 SFC/well, the upper limit for the grey zone of 5–7 SFCs/well defined by T-SPOT.TB and the US Food & Drug Administration. SFC = spot-forming cell; IFN-γ = interferon-gamma; P32 = 32 weeks’ gestation; M12 = 12 months postpartum; ESAT-6 = early secreted antigenic target 6; CFP 10 = culture filtrate protein 10.