Comparison of viral load between BAL and serum. (A) Viral load in samples from patients with DAH (N = 20). Each group indicates viral load in BAL (blue box) and serum (red box). P values are .002, .88, .002, and .30 in total, CMV, HHV-6, and others, respectively. (B) Viral load in samples from patients without DAH (N = 19). Each group indicates viral titer in BAL (blue box) and serum (red box). P values are .003, .66, .030, and .055 in total, CMV, HHV-6, and others, respectively.