A patient is suspected to be infected with a specific virus, but the concentration of the pathogen in their body is extremely low and symptoms are not yet visible. Conventional diagnostic tests fail to detect the infection. Which of the following techniques can be successfully employed to detect the presence of the pathogen at this early stage?

Step-by-step solution

Early detection of a disease when the pathogen concentration is extremely low and symptoms are not yet visible cannot be achieved by conventional methods like routine serum and urine analysis. Polymerase Chain Reaction (PCR) is a molecular diagnostic technique that amplifies the nucleic acid of the pathogen. Because it involves amplification, it can detect very low amounts of viral DNA or RNA, making it highly effective for early diagnosis of infections such as HIV. The Widal test is specifically used for diagnosin