Vaccination is considered one of the most successful strategies for fighting infectious diseases, an area where there still remain significant unmet medical needs. It has been in the past difficult for business to find opportunities in this area, due to the long development times and to the risks involved in testing. Sancha Salgueiro, Charlotte Dyring and Wian de Jongh at ExpreS2ion Biotechnologies look into how a relief in this status has been observed recently.