<qa>  What is the most important risk factor for influenza in pregnant women?i pandemic influenza infection in the second and third trimester of pregnancy is associated with an increase in adverse fetal outcomes fetal loss, stillbirth, neonatal mortality, significant neonatal morbidity, prematurity ii close contact with young children 2 yrs at home or work is the most important risk factor for influenza in pregnant women iii higher scores on a scale of community infection prevention a combination of self-reported hand hygiene adherence, avoidance of ill persons and avoidance of crowds are protective against influenza iv receipt of seasonal influenza vaccine from 2007 to 2009 will increase the risk of illness due to influenza AH1N1v in the second and third waves of the pandemic. 