A Pollyanna virus, it always sees the best in everyone. Sorry. It’s a polyoma virus.
Has decoy cells in the urine.
Reactivates in transplant patients, usually 9 to 12 months after transplant. Not found in the Whopper, despite the name (BK was the initials of the first patient in which it was discovered).
Hemorrhagic cystitis, reactivation can accelerate rejection and uteteral stenosis.