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We tested:

* Nasal only
* Nasal, and tongue and cheek swab
* Nasal, tongue and cheek, and hold swab in air near back of throat and cough
* Nasal, and cough
* Just cough

Adding the cough turned "day 0 negative" into a slight positive test, and "day 2 positive" into a super dark purple line positive test. Darker than we've ever seen. 😬

My totally unscientific understanding of this, is that this is a "throat Covid," not a "nose Covid." And that the false negative rate is higher for this wave.