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Polymerase Chain Reaction (PCR) tests are vital tools in medical diagnosis, used to detect and quantify DNA in a sample. They work by amplifying small segments of DNA, making it easier to analyze specific genes or sequences. These tests play a critical role in identifying various conditions, including infections like COVID-19, and are also instrumental in genetic research, forensic analysis, and paternity testing. Understanding how PCR tests work and their widespread applications can shed light on their significance in modern healthcare and research.