TABLE 1.

Cytokine concentrations in pleural wash fluids and sera from C57BL/6 (B6) and BALB/c (Bc) mice at D30 p.i.^a

Sample	Expta	No. of mice (B6/Bc)	Concn (pg/ml)b
			IL-4		IL-5		IL-10		IFNγ
			B6	Bc	B6	Bc	B6	Bc	B6	Bc
Pleural wash fluidc	1	6/6	2.5	0.8	24.8	1.2	296.3	7.9	90.2	22.9
	2	6/6	1.9	0	216.9	2	18,142.6	0	309.6	36.2
Serumd	2	6/6	0.1	0	159	28	18,290	0	4,084	0
	3	8/8	8	0.2	102	36	15,165	525	2,660	265
	4	6/3	2.95	0	347	4.7	5,412	130	5,253	844

^aFour experiments were performed, two for the pleural wash fluid and three for the serum; experiment 2 included both.

^bConcentrations, measured by two-site ELISA, in infected mice, values for naive mice were subtracted.

^cThe combined results from the two experiments were statistically different (P < 0.01 for IL-4, IL-5, and IL-10 and P = 0.016 for IFN-γ) as calculated by the Mann-Whitney U test.

^dThe combined results from the three experiments were statistically different (P < 0.0001 for IL-4, IL-5, and IFN-γ and P = 0.0002 for IL-10) as calculated by the Mann-Whitney U test.