If all tests are negative, anidulafungin will be discontinued on day 4. If 1,3 beta-D-glucan is positive (>80 pg/ml) and / or blood cultures are positive for Candida species, anidulafungin will be continued for >14 days. Blood will oe collected for determination of 1,3 beta-D-glucan on days 7, 10, 14, 17, 21, 24 and 28.