TABLE 3.

HLA-DR expression in fibroblast-like SC stimulated with IFN-γ and infected with C. trachomatis serotype D

Infection type	Treatment	HLA-DR-positive cells (%)a
Mock	Medium	—b
Mock	10 U of IFN-γ per ml	91 (5)
Mock	10 U of IFN-γ per ml plus 50 U of IFN-β per ml	61 (7)c
C. trachomatis (MOI of 5)	10 U of IFN-γ per ml	50 (15)c
C. trachomatis (MOI of 5)	10 U of IFN-γ per ml plus 100 nU of anti-IFN-β per ml	79 (4)d

^aAverage number (standard deviation) of four separate experiments. 

^b—, not detectable. 

^cSignificantly different from values for mock-infected cells after IFN-γ stimulation (Welch t test, P ≤ 0.01). 

^dSignificantly different from values for infected cells after IFN-γ stimulation (Welch t test, P ≤ 0.01).