Anchorage-dependent cells such as Vero cells are used widely as a platform for viral vaccine production. Perfusion bioprocesses enable a constant addition of nutrients and removal of byproducts while cells are in a bioreactor. That results in cell densities that are higher than those for conventional batch or fed-batch processes. In the study herein, Eppendorf researchers tested the suitability of a spin filter as a cell-retention device. They cultivated Vero cells on Cytodex 3 microcarriers (10 g/L) in an Eppendorf…