I applied to 5 public health PhD programs. I've heard from UT Houston and Emory that the applications were fwded to the departments, but nothing since. I was rejected from Ohio State less than a week after my application was final - I'm assuming my POI already had someone lined up, or wasn't taking on students (I really didn't fit with any other faculty either). It was at the bottom of my safe schools and I'm pretty sure I'm a viable candidate for better programs, so it really didn't bother me. That said, it was a pretty quick decision! So if you've applied there and haven't heard back, it's probably a good sign!