Or perhaps it was that they don't need a test, which I can only assume is because asymptomatic cases weren't considered a concern at the time. It's not on their guidelines page anymore, I can only find articles referencing it, not the passage on the CDC's site itself.
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If you don't have enough tests to go around, it makes sense to test those people who are both more likely to be infected and more likely to spread the disease to others if they are infected. Coughing and sneezing significantly increases people's exposure to your bodily fluids - which is why evolution selects for these traits - but even an asymptomatic carrier is still going to be doing things that can expose the people they associate with.