mc1208

Hi, this question has been bothering me for quite some time. I just went through rotations in labs and I didn't find anything that was specifically in my field of interest. I really want to work with pathogens and research mechanisms of pathogenicity, however that isn't much of an option at the one school I was accepted to. I am currently just starting work in lab doing a lot of genetic work on non pathogenic organisms, which while the work itself is fine, I feel like what i'm doing really isn't significant in any way. I was wondering if it is possible to finish my PhD and then go on to do research on this topic or am I going to be stuck in the specialization of my PhD?