Significant correlates of seasonal influenza immunization during pregnancy included healthcare provider recommendation [ OR = 3.934 , 95 % CI : ( 1.331,11.627 ) ] , use of hospital-based practices as primary source of prenatal care [ OR = 2.584 , 95 % CI : ( 1.091,6.122 ) ] , and perceived interpersonal support for influenza immunization [ OR = 3.405 , 95 % CI : ( 1.412,8.212 ) ] .