[Opportunistic toxoplasmosis in a case of heart transplantation].

Infection with toxoplasma gondii is a serious complication in the immunocompromised heart transplant recipient. We reported a case of toxoplasmosis in a seronegative heart transplant recipient detected on endomyocardial biopsy. This patient was treated with oral pyrimethamine and sulphadiazine. Because primary toxoplasmosis occurred in seronegative patients receiving hearts from sero-positive donors, it is necessary to screen both recipients and donors for T. gondii. Prophylaxis with pyrimethamine in sero-negative patients transplanted with a heart from sero-positive donors confers considerable benefit.