Dengue fever is a viral infection caused by one of any of four related viruses: dengue virus 1, 2, 3, and 4. A person can be infected with dengue multiple times in their life.

​Molecular Tests (PCR): Polymerase Chain Reaction (PCR) is a molecular technique used to detect the genetic material (RNA) of the dengue virus. PCR tests are highly sensitive and specific, capable of detecting the virus during the early stages of infection.