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What Is the Measure of Efficiency for a Vaccine?
Sickness is the presence of symptoms. A sign is something that someone could measure and tell that you're in fact that like virus in your nasopharynx or something else, right? In a vaccine trial, they tell you if you have any of these symptoms,. They give you a paper with the exact symptoms listed to make sure you're picking them up. So for flu, it would probably be fever, sore throat, cough.