Table 4.

In vitro production of cytokines by splenocytes in three strains of mice the day before the genital challenge

Mouse strain	Group	IL-4 (pg/ml ± 1SD)		IFN-γ (ng/ml ± 1SD)
		EB*	Medium	EB	Medium
C3H/HeN	Immunized	<0·1	<0·1	94 ± 16†	<0·03
	Sham immunized	<0·1	<0·1	<0·03	<0·03
C57BL/6	Immunized	2 ± 1	<0·1	112 ± 34†	<0·03
	Sham immunized	<0·1	<0·1	<0·03	<0·03
BALB/c	Immunized	17 ± 0	<0·1	96 ± 9†	<0·03
	Sham immunized	<0·1	<0·1	<0·03	<0·03

^*UV-inactivated C. trachomatis MoPn EB were added at a ratio of 10 : 1 to the irradiated splenocytes (APC).

^†P < 0·05 by the Student's t-test compared to the corresponding sham immunized group.