Conclusions :
the significant association with myocardial involvement in both women demonstrates the increased risk of exposure to H 1 N 1 influenza virus in pregnant women .
Conclusions :
While it is not possible to ascertain retrospectively if myocarditis was caused by either infection with H 1 N 1 virus or as a result of pregnancy ( in the absence of endomyocardial biopsies ) , the significant association with myocardial involvement in both women demonstrates the increased risk of exposure to H 1 N 1 influenza virus in pregnant women .