Table 3.

Correlation between CAST detection and past anti-CMV immunity in recipients before alloHCT and donors

A. All recipients
Pre-alloHCT CASTs	Anti-CMV IgG serology before alloHCT		p-value
	Negative (N=169) N (%)	Positive (N=146) N (%)
< 1 cell / μL	167 (99)	66 (45)	<0.0001
≥ 1 cell / μL	2 (1)	80 (55)
B. HLA matched sibling donors
Pre-alloHCT CASTs	Anti-CMV IgG serology		p-value
	Negative (N=25) N (%)	Positive (N=26) N (%)
< 1 cell / μL	25 (100)	6 (23)	<0.0001
≥ 1 cell / μL	0	20 (77)

Abbreviations: alloHCT – allogeneic hematopoietic cell transplant, CAST – CMV antigen specific T cell, CMV – cytomegalovirus, HLA – human leukocyte antigen, IgG – immunoglobulin G, N – number