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Don't go to work if you've had a fever in the last 24 hours.
"CDC recommends that people with influenza-like illness remain at home until at least 24 hours after they are free of fever (100° F [37.8°C])"
I had been wanting a concrete guideline like that.
What thermometer should I get?
I had been wanting a concrete guideline like that.
What thermometer should I get?

no subject
I use an oral digital thermometer, and I recommend getting some disposable end covers if it doesn't come with them - covers keep the thermometer clean without needing to figure out how to wash it sufficiently (I'm pretty sure rubbing alcohol would work, but definitely check the manual to make sure that won't damage it over time). Consumer reports likes them as well, and here's study-based advice on using them.