Which program at UCSF? I'm also applying to public health PhD programs without my master's (so far I think Columbia, Harvard, Yale, Berkeley, Washington, Minnesota, UIC, Boston University, and maybe Johns Hopkins; as a backup I'm applying to nursing PhD programs at Columbia, UCSF, and UIC). I may try to find a safety school or two (for public health), but it's possible that any schools that would be in the safety category for me are not as highly ranked as I'd like, in which case I might opt to do a nursing PhD program instead. I just hired a GRE tutor hoping to get my quant scores up, hoping that if I do extremely well it will help my case. What's your background? It seems like if you have excellent GRE scores, 1-2 years of research experience (especially if you have any publications), strong letters of rec, a good fit in terms of your research interests, and a well written SOP with a solid narrative about your experience and your research interests, that you can get in without a master's.