Can a test tell you if you had Omicron? I’m vaxxed and boosted and wore a mask while giving a 2 hour final exam to 300 largely-maskless freshmen on Dec. 8 in a windowless lecture hall. By Dec. 12 my nose was running like a faucet and I was very fatigued. The runny nose and congestion ended Dec. 15 and the fatigue was…