As the NIH is home to NIAID, it seems to me they should have the facilities onsite to dispose of such waste. Why take the chance to truck it up 270 all the way to Frederick when they certainly have the facilities to dispose in Bethesda?
Something ain’t right ...
I think the issue is probably more one of trying to deal with bureaucracy than anything else. I recall seeing some article--here it is: "Louisiana to Block Ashes of Ebola Victims Belongings From Entering State." I doubt that the Louisiana attorney general is the only one who is so clueless--everyone who is "educated" about the Ebola virus by reading "The Hot Zone" is probably equally clueless. So I would make an educated guess here and say that rather than potentially deal with colossal ignorance, administrators over at the NIH decided to just send the waste where they are used to handling such waste on a routine basis. I.e., USAMRIID.
Of course, the Ebola virus is not very contagious, and is as easily killed as any other virus. But that's not the issue here.