research interests on AMCAS

so I looked to see if there is a thread on this, but I didn't see one.... (let me know if I missed it though) I am applying for a bunch of MD/PhD programs this year, and I have a question about what I should designate for "combined degree areas." So I am a chemistry major and most of my research has been in chemistry, which I really enjoyed, but I have recently become very interested in infectious diseases so I think I want to do my PhD in microbiology. In part because I wanted to do basic... research interests on AMCAS
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