TABLE 2.

Comparison of BAL fluid and blood CMV viral loads with CMV IHC staining result

IHC staining result for CMVa	BAL fluid			Blood
	CMV viral load (no. of copies/ml)		No. of samples	CMV viral load (no. of copies/ml)		No. of samples
	Median	Minimum-maximum		Median	Minimum-maximum
Negative	0	0-193,442	26	0	0-40,587	20
Atypical	47,678	2,791-312,175	8	1,176	0-14,019	7
Typical	1,548,827	555,505-2,450,702	5	189,013	0-1,491,020	5
P value	0.001b	0.010c		0.028d	0.15c

^aComparison of the differences in CMV viral loads between blood and BAL fluid were significantly different for the negative category (P = 0.21) and atypical category (P = 0.016), as stratified according to IHC characteristics (Wilcoxon signed-rank test). For the atypical category, load in BAL fluid was higher than that in blood.

^bKruskal-Wallis test. For the negative samples, the CMV viral load in BAL samples was significantly different from those in both the atypical and typical samples (Dunn's multiple-comparison procedure).

^cOrdered logistic regression analysis.

^dKruskal-Wallis test. The results for the negative and positive, typical samples were significantly different (Dunn's multiple-comparison procedure).