Human alveolar echinococcosis after fox population increase, Switzerland - Schweiger, A; Ammann, RW; Candinas, D; Clavien, PA; Eckert, J; Gottstein, B; Halkic, N; Muellhaupt, B; Prinz, BM; Reichen, J; Tarr, PE; Torgerson, PR; Deplazes, P (Emerg Infect Dis, 2007)