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That protein-antibody complex continues to travel up the strip and binds to another, presumably immobilized antibody that concentrates the red dye so it shows up as a result. So the tests have to be simple and reliable. Password and Confirm password must match. The directions asked me to tilt my head back, which Radomski said was a good way for her to see that I was swabbing far enough up my nose, as well as circling the swab around my nasal cavity—something many tests require for a good sample. I tried what was available by late April: two molecular tests, from Lucira and Cue Health, and three antigen tests, from Abbott, Ellume, and Quidel. Within the cartridge, that copying step is carried out via microfluidics.

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