Giery said every donor program does extensive testing of every potential donor, but rabies isn't part of the routine screening, partly because human cases are so rare.

NPR: NC Airman At Center Of Rabies Case Was Outdoorsman

In both cases, including ROE in a list of screening criteria can help narrow down the list of potential investment candidates.

FORBES: Beware: Weak Link Between Return On Equity And High Stock Price Returns

The kingdom also is using sophisticated technology -- thermal screening equipment at entry points and mobile devices to document suspected cases of the flu.

CNN: Gearing up for prevention: The Hajj meets H1N1