Kids being lethargic, for example, or is it often a combination of these symptoms that you laid out? >> well, it's absolutely a combination of symptoms because to your point, not one of these symptoms is correlated with a specific diagnosis. lethargy, absolutely, is a sign here of maybe a high fever or dehydration. that's something that should herald, let's get your child seen. in every single case here, often there's a sense, especially amongst adults, even amongst kids that maybe this will pass. we'll spend a day in the bed. we'll do symptom control. we won't get a diagnosis, and then they w...