Measles is a highly infectious viral disease that can cause serious health complications. One of the methods for diagnosing measles is through the use of the Polymerase Chain Reaction (PCR) technique, which is a type of qualitative test. The PCR technique is a highly sensitive method that allows for the detection of small amounts of the measles virus in a patient’s blood or respiratory secretions. The test works by amplifying the genetic material of the virus using specific primers and probes, which are then detected using fluorescent dyes. A positive PCR result indicates the presence of the virus in the patient’s sample, while a negative result suggests that the patient is unlikely to have measles. The PCR test is a valuable tool in the diagnosis of measles, allowing for early detection and prompt treatment of the disease.