Lateral flow tests, when used to diagnose the presence of infectious diseases, are relatively inexpensive and elegantly simple to use. They involve applying a biological sample—of blood or urine, for instance—to one end of a test strip. As the sample flows up the strip, it encounters various reagents, which are designed to produce a chemical reaction when they come in contact with a particular target, such as a protein, bacteria, parasite or virus. If your target is present, you’ll get a clear visual signal, an “aha” moment, like seeing a bar appear on a pregnancy test moments after peeing on a stick. 

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