Traditionally, cell-based vaccine production is performed using stainless steel bioreactors that require extensive cleaning procedures. Because disposable bioreactor systems have no need for cleaning and validation, they can significantly reduce start-up times for good manufacturing practice (GMP) manufacturing of cell-based vaccines (1). Although they are susceptible to a broad range of viruses, Vero cells were recently successfully used for industrial-scale influenza vaccine production (2,3,4). However, these adherent cells can proliferate only when provided with a suitable surface on which to…