I started by PhD with a simple project to define the molecular epidemiology of RSV infection globally. During my PhD I initiated and contributed to a number of other projects which helped me to learn more about epidemiology, virology and immunology. These projects have become part of my thesis. All studies had one thing in common, all were some form of public private partnership (PPP) projects. Now, at the end of my time as a PhD candidate, I can see that PPP is the most important underlying theme of my thesis, which has inspired me, influenced by thinking as a scientist.