Kristing,
I, too, am going to do a Med-Peds residency and am seriously considering ID. I don't know about you, but when I was interviewing (up and down the East Coast, from North Carolina to Boston) it seemed like a disproportionately large number of Med-Peds residents and applicants also really liked ID and international medicine. For me it was good confirmation that I was doing the right residency.
Regarding your question about ID: I've seen it done several different ways. I know someone applying for combined Med-Peds ID right now. I think you basically have to arrange it on an individual basis with the program (eg they won't be listed on FREIDA). I believe you can make your research time count towards both, so you're looking at 2 yrs research, 1 yr clinical adult, 1 yr clinical peds. I also seem to remember that on
www.medpeds.org there is a guy that can help you find all the combined fellowships in the country. The whole thing about only needing adult ID and doing some clinical rotations in peds is also an option. This is because in the 'old days' about a decade ago, there was not any such thing as 'peds ID'. Those who were ID-boarded were supposed to be able to take care of adults and kids, regardless of their original residency. The Peds ID Board is a relatively new thing. Lastly, if you're interests are in HIV, I think the IDSA (infectious diseases society of america) is offering or will offer a one-year HIV 'specialization', not a full fellowship, but some extra training to distinguish yourself. I also know a Med-peds graduate that does only HIV primary care and never did a fellowship.
So your options are:
1. GO FOR IT!! Med-Peds ID fellowship = 4-5 years
2. MAKE UP YOUR MIND!! One or the other...if you do adult, more likely to be able to practice in both = 3 years
3. GET ON WITH IT!! Start practicing and/or do an HIV specialization = 0-1 year.
Best of luck...
by the way, which Med Peds programs are you looking at?
cramers