Table 1:

Summary of patient histories

Patient no: Age/Sex	Primary Disorder	Type of Transplant	Interval between Transplantation and Symptoms Onset	Neurological Symptoms					Specimen and Quantity of HHV-6 PCR	Outcome
				Disorientation	Short-term Memory Loss	Coma	Hypopnea	Convulsion
1:49/F	Acute leukemia	Cord blood stem cell	27	+	+				9000 (CSF) and 3000 (blood*) copies/mL	Improved (remaining disorientation and memory loss)
2:41/F	Acute leukemia	(Peripheral blood stem cell)	(979)		+	+			49,000 copies/mL (CSF)	Improved (remaining disorientation and memory loss)
3:55/M	Non-Hodgkin lymphoma	Bone marrow	22	+			+		400,000 copies/mL (blood)	Dead (sepsis)
4:52/M	Non-Hodgkin lymphoma	Bone marrow	14	+	+			+	58,000 copies/mL (CSF)	Improved
5:36/M	Acute leukemia	Bone marrow	19	+	+	+	+	+	2300 copies/mL (CSF)	Dead (intestinal pneumonitis)
6:37/F	Acute leukemia	Bone marrow	17			+	+	+	3000 copies/mL (CSF)	Dead (liver failure)

Note:—HHV-6 indicates human herpesvirus 6; PCR; polymerase chain reaction.

^*Peripheral blood.