Table 1.

Population characteristics

	Unvaccinated volunteers n=20	Vaccinated volunteers n=30	Transplant recipients n=17	p value
Female – n (%)	18 (90.0)	27 (90.0)	4 (23.5)*	<0.01
Age – mean (SD) – years	39 ± 10	36 ± 12	49 ± 12*	<0.01
Caucasian	15 (75.0)	24 (80.0)	13 (76.5)	0.90
h/o pregnancies – n (%)	7 (35.0)	12 (40.0)	3 (17.6)	0.69
h/o blood transfusions – n (%)	1 (5.0)	1 (3.3)	9 (52.9)	<0.01
Months since transplant – median (min – max)	NA	NA	25 (9 – 147)	NA

Note: NA (not applicable)