Our overall hypothesis is that CSA is safe in this patient population and that it will have antiviral and anti-cytokine effects as measured in laboratory tests.

The initial dose will be 9 mg/kg/day oral divided q12h or 3 mg/kg/day by continuous IV infusion. Oral administration is generally preferred, however IV administration can be used if oral administration is not feasible or cannot be tolerated, or at the physician-investigator's clinical discretion. The dose will be adjusted to target a trough level of 200 to 300 ng/ml, which is in alignment with common clinical practice. The planned duration of CSA treatment is up to 14 days, with planned discontinuation upon discharge from the hospital. Dose reduction of 25% to 50% can be made for patients who experience adverse events such as hypertension or serum creatinine elevation.

The end of study will be study day 30 for those patients who have been discharged from the hospital. If the patient remains in the hospital, the subject will still complete the end of study visit at day 30 as planned, but will continue to be followed until date of discharge.