Hmmm. I have a novella-length thing stalled for much the same reason, because I need to do some serious research on the architectural history of the Vatican and I just haven't found the time.
That said, the novel I'm currently working on, which also, coincidentally, involved doing some research on epidemiology and microbiology (and will require a *lot* more before the thing is ready to go out the door) was moving along fairly well until I got bonked on the head last week.
I think, and I'm sort of trying to figure this out as I type so bear with me if I make no sense, that in the case of the novel, while the science is absolutely critical, it's also of a sort than can be temporarily handwaved from a slightly-better-than-Wikipedia level of knowledge as I get the plot itself written down and the characters doing what they need to do. I expect to go back on a final pass and spend a *lot* of time getting the science right, but I know enough now to get the placement of the science right. Later, when I go back, the science will be the sole focus so I'll be able to put the time and attention into it without being distracted by needing to herd characters around at the same time. In the case of the novella, the research will dictate action closely enough that I can't get away with that.
I don't know if the nature of your story, or of your writing process, will allow you to skimp on your research for this draft knowing you're going have to go back to it later (some people can't stand that) but if so, it might be worth trying. Make sh*t up, fix it later, is my favorite early-draft writing mantra (-:
Dunno if that helps any, sorry.
-Suzanne
Why sorry?
I think it's a question of upfront research as opposed to finding something I need partway through a story. Partway through, I'm involved enough that I can use my "la la la details to come later" technique and all is good.
But to do it upfront? I get all obsessively scientific and start to think about citations and multiple sources and the fact dish runs away with the story spoon. I've yet to get both halves of my brain to work happily together.
A different answer is that I'm also engrossed in a novel quartet that I promised myself I would complete as an educational experience, but also because it's just so darn fun. And doesn't require any research.
Hopefully you and I aren't channeling the same idea requiring epidemiology and microbiology. If we are, you probably get dibs because it will be a while before I get to it.
Nothing much to report on the short story front. I hope to have my catadromous children story finished by the end of the weekend. That will be my first story of 2011 that doesn't involve apocalypse. Yay!