BK polyomavirus was the first described in 1971 in a kidney transplanted patient. The virus infects the kidney-urinary tract during the first years of life, and 80% of the adult population is latently infected, in a generally asymptomatic way.


However, the infection provokes overt pathology in a context of immunosuppression. In kidney transplanted patients, reactivation of the virus from sites of persistent infection  frequently occurs and is associated with nephropathy, which remains an important cause of kidney graft failure.

 There is no other treatment than reduction of immunosuppressive therapy, with the hope of improving antiviral host response. Nevertheless, this strategy also increases  the risk of transplant rejection.

Our work is based on the hypothesis of a reactivation of the BK virus favoured by the immunosuppressive therapy. We are interested in the evolution of the viral population upon treatment (diversity, selection of variants,…).  This project is carried out in collaboration with the Transplantation and Immunology Research Center of Nantes (UMR 1064).



Jérôme BOURRET, Ignacio Bravo

Céline Bressollette-Bodin; MCU‐PH Nantes CHU (BKNAB IP)
Dorian McIlroy; MC Uni Nantes

Xavier Saulquin, PU Univ Nantes