Do you treat empirically for strongyloidiasis in asymptomatic returning travelers with unexplained eosinophilia despite negative stool studies?

I would not treat an asymptomatic returning traveler with unexplained eosinophilia empirically for strongyloidiasis. This parasitic infection is rare in travelers (unless they are long-term expatriates, and even then it is unlikely unless they have spent a lot of time barefoot in potentially contaminated soil). I would instead intensify the search for other etiologies of eosinophilia and wait for a Strongyloides IgG titer to be run. We send these out and usually have results in two weeks or less.