Characteristics of 101 healthcare workers who reported receipt of monovalent pandemic (H1N1) 2009 influenza vaccine and did not report confirmed pH1N1 infection.

aSome columns do not total 104 due to missing data.bp-values for association calculated by chi-squared tests or Fisher's exact tests.cinfluenza like illness is defined as temperature ≥37.8°C plus cough or sore throat.