TABLE 1.

Cell types and surface markers identified in pulmonary tissue at increasing time points postchallenge with NTHI^a

Animal group and time postchallenge (h)	Semiquantitative score for cell type:
	γδ+	CD4+	CD8+	MHC-II	B
Immune
0.5	+	+	++	+	+
1	++	+	+++	+	+
2	ND	+	++	++	+
4	−	+	++	++	+
8	ND	++	+++++	++++	++
24	−	+++	+++++	+++	+++
Nonimmune
0.5	−	+	+	+	+
1	−	+	+	+	+
2	ND	+	+	+	+
4	−	+	+	+	+
8	ND	+	+	+	+
24	−	+	+	+	+

^aAnalysis of the cell type present was performed by immunoperoxidase staining using monoclonal antibodies. Values represent a semiquantitative score as expressed by the cell number per field magnified ×40 in infected tissues and are scored as follows: −, no cells seen on multiple sections; +, 1 to 5 cells present; ++, 6 to 10 cells present; +++, 11 to 20 cells present; ++++, 20 to 50 cells present; +++++, >50 cells present. ND, not done.