Does each bead count?: A reduced-cost approach for recovering waterborne protozoa from challenge water using immunomagnetic separation - Fava, Natália de Melo Nasser; Silva, Kamila Jessie Sammarro; Snelling, William John; Ternan, Nigel George; Dooley, James Stephen Gerard; Sabogal-Paz, Lyda Patricia (Journal of Water and Health, 2021)