The study will collect safety and efficacy data from pediatric patients who are prescribed intravenous micafungin for prophylaxis. During this trial, patients with two separate indications will be treated. The first, Invasive candidiasis will have a minimum treatment of 2 weeks. The second, Oesophageal candidiasis will have a minimum treatment of 1 week. Both indications will have a follow-up period of 4 weeks after treatment.