The vaccine manufacturing industry is continuously seeking more flexible and time-saving solutions for a quicker response to pandemic outbreaks (1, 2). For influenza, vaccine is traditionally produced in fertilized hen eggs and purified in fixed steel equipment. Here we describe the scale-up of a downstream purification process of cell-based influenza virus, from a 10 L cell culture to the purification from a 50 L culture using ReadyToProcess single-use technology. Single-use technology reduces the need for time-consuming device preparations, such as…