The program may conclude you've probably got swine flu -- known as the 2009 H1N1 strain -- but that rest and fluids should be enough care, or that you need a non-emergency call to your own doctor.
But answer that you've been short of breath -- or that you felt better but then the fever came back with a worse cough -- and the program flashes: "You might be very sick! Call your doctor now."
It's part of efforts, including local hot lines, to keep people who aren't that sick from flooding already crowded emergency rooms.
Microsoft licensed the self-assessment tool from Emory, which based it on what the Centers for Disease Control and Prevention has determined are key risks factors for a bad flu outcome. A large insurer tested the tool against more than 2,500 records of patient visits for flulike symptoms in Colorado, and only two people deemed low-risk were hospitalized within the following two weeks.
"It reflects the best available science," said Emory emergency medicine specialist Dr. Arthur Kellermann.
The CDC also posts lists of signs to seek emergency flu care, including for children, at http://www.flu.gov.
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