TABLE 2.

Effect of nasal lavage fluid sampling on NP colonization by NTHI 12 in chinchillas^a

Days after bacterial challenge	No. of animals with positive NP colonization/total no. of animals challenged (%) in:
	Study A	Study B
1	7/7 (100)	7/7 (100)
2	7/7 (100)	7/7 (100)
4	7/7 (100)	7/7 (100)
6	5/6 (83)	7/7 (100)
8	5/8 (63)	7/7 (100)
16	1/6 (17)	ND
23	0/6 (0)	ND

^aChinchillas (2 to 3 months old) were challenged intranasally with 10⁸ CFU of NTHI 12 on day 0 as described in Materials and Methods. In study A, NP lavage was performed on each group only once. In study B, NP lavage was performed five times on the same group. 

^bND, not determined.