Table. Detection of XMRV in respiratory tract secretions from 329 persons*.

Group	Patient median age, y	Underlying disease	Sample	XMRV+
1 (75 patients with RTI)	42	None	Sputum, nasal swab	3/75 (2.3%)
2 (31 patients with RTI)	60	COPD	BAL	1/31 (3.2%)
3 (161 patients with RTI)	32	Immunosuppression after SOT or BMT	BAL, TS	16/161 (9.9%)
Control (62 persons with no RTI)	35	None	BAL, throat swab	2/62 (3.2%)

*XMRV, xenotropic murine leukemia virus; +, positive for XMRV–specific sequences by PCR; RTI, respiratory tract infection; COPD, chronic obstructive pulmonary disease; BAL, bronchoalveolar lavage; SOT, solid organ transplantation; BMT, bone marrow transplantation; TS, tracheal secretion.