 The investigators objectives are: First, to validate an extraction method from blood infected by fungi species. Secondly, the investigators want to develop three real-time PCR: A fungal real-time PCR able to detect most fungal species; a real-time PCR targetting Candida albicans and Aspergillus fumigatus which are two clinically important pathogens. Then blood samples of patients classified according to EORTC consensus will be collected during the study in order to evaluate and validate our method on clinical samples. Results will allow the investigators to determine the sensitivity, specificity and reproducibility, negative and predictive values. 