Inclusion Criteria:

Patients will be eligible following any type of allogeneic transplant to receive CTLs as
prevention or for early reactivations as defined below.

1. Prior myeloablative or non-myeloablative allogeneic hematopoietic stem cell
transplant using either bone marrow or peripheral blood stem cells within 12 months.

2. Prevention for patients at risk of CMV, adenovirus, EBV, BK virus, or HHV6 infection

3. Treatment of reactivation or infection which is defined for each virus as below

- CMV- CMV antigenemia is monitored at least weekly post transplant. Reactivation
is defined at CMV antigenemia with <10 leukocytes positive or elevated PCR. If
any patient develops CMV antigenemia with >10 leukocytes positive or clinical
evidence of CMV infection (defined as the demonstration of CMV by biopsy
specimen from visceral sites (by culture or histology) either pre or after CTL
infusions, standard treatment with Ganciclovir, and/or Foscarnet and
Immunoglobulins will be initiated. Patients may receive CTLs for antigenemia or
elevated PCR without visceral infection.

- Adenovirus- Adenovirus infection will be defined as the presence of adenoviral
positivity as detected by PCR or culture from ONE site such as stool or blood or
urine or nasopharynx.

Adenovirus disease will be defined as the presence of adenoviral positivity as
detected by culture from more than two sites such as stool or blood or urine or
nasopharynx.

In patients who meet the criteria for disease Cidofovir may be added unless the
subject could not tolerate this agent due to nephrotoxicity. Patients may receive
CTLs for elevated PCR in blood or stool.

- EBV- EBV-LPD is defined according to recent guidelines as proven EBV-LPD defined
by biopsy or probable EBV-LPD defined as an elevated EBV DNA level associated
with clinical symptoms (adenopathy or fever or masses on imaging) but without
biopsy confirmation. Patients with EBV DNA reactivation only may receive CTLs on
study. Patients with proven or probable EBV-LPD should also receive Rituxan

- BK virus- Patients post transplant may develop asymptomatic BKV viruria or
viremia. BK reactivation will be defined as detection of elevated BK levels by
PCR in blood or urine while disease will be defined as detection in multiple
sites or in one site with symptoms. Cidofovir has been administered
intravenously in a low dose (i.e. up to 1 mg/kg 3 times weekly, without
probenecid) or a high dose (ie, 5 mg/kg per week with probenecid) to HSCT
patients with BK infections but no randomized trials are available proving its
clinical efficacy. In patients who meet the criteria for disease Cidofovir may
be added unless the subject could not tolerate this agent due to nephrotoxicity.

- HHV6- HHV6 reactivation will be defined as detection of elevated HHV6 levels by
PCR in blood while disease will be defined as detection in multiple sites or in
one site with symptoms. Ganciclovir, Cidofovir, and foscarnet have variable in
vitro activity against HHV-6, and may have a role in treating HHV-6-associated
disease - hence one or more of these agents will be added in patients with
disease.

4. Treatment may be given to eligible patients with a single or multiple infections.
Patients with multiple infections with one or more reactivation and one or more
controlled infection are eligible to enroll.

5. Clinical status at enrollment to allow tapering of steroids to less than 0.5
mg/kg/day prednisone.

6. Karnofsky/Lansky score of ≥ 50

7. ANC greater than 500/µL.

8. Bilirubin
9. AST
10. Serum creatinine
11. HgB > 8.0

12. Pulse oximetry of > 90% on room air

13. Available multivirus-specific CTLs

14. Negative pregnancy test in female patients if applicable (childbearing potential who
have received a reduced intensity conditioning regimen).

15. Written informed consent and/or signed assent line from patient, parent or guardian.

Exclusion Criteria:

1. Patients receiving ATG, or Campath or other immunosuppressive T cell monoclonal
antibodies within 28 days of screening for enrollment.

2. Patients with other uncontrolled infections. For bacterial infections, patients must
be receiving definitive therapy and have no signs of progressing infection for 72
hours prior to enrollment. For fungal infections patients must be receiving
definitive systemic anti-fungal therapy and have no signs of progressing infection
for 1 week prior to enrollment.

Progressing infection is defined as hemodynamic instability attributable to sepsis or
new symptoms, worsening physical signs or radiographic findings attributable to
infection. Persisting fever without other signs or symptoms will not be interpreted
as progressing infection.

3. Patients who have received donor lymphocyte infusion (DLI) within 28 days.

4. Patients with active acute GVHD grades II-IV.

5. Active and uncontrolled relapse of malignancy