Table 1. Cell infiltration and alveolar change of the mice lungs in each group at day 3, 7, 28 and 56.

Groups	3 day after instillation	7 day after instillation	28 day after instillation	56 day after instillation
saline control	0	0	0	0
Silica	I	I+∼II	I∼I+	0∼I
Silica+antiCD25mAb	I+∼II	II+∼III+	I+∼II	0∼I

The degree of inflammation was assessed by the histological analysis of six random fields per sample (n = 5).