Cytomegalovirus Reactivation in Non Immunocompromised Patients Undergoing Cardiac Surgery

We hypothesized that the stress of cardiac surgery and cardiopulmonary bypass can cause reactivation of a latent CMV infection and that reactivation might be more prevalent in patients with complicated post-operative course. The study aims are: * To study whether cardiac surgery is a trigger for latent CMV reactivation and to compare reactivation rate between sub groups of patient with complicated post-operative course and non complicated post operative course. * To study the relationship between expression IL28 SNP rs12979860 and the risk of CMV replication in the non immunocompromised patient undergoing cardiac surgery.