This document discusses HIV and hepatitis C virus (HCV), describing them as "killer twins" that pose significant health challenges. It notes that both viruses are difficult to detect, have no cure, can cause extensive damage before producing symptoms, and represent serious concerns in India given the large number of people infected. The document outlines similarities between HIV and HCV and issues regarding how to combat an unknown disease like HCV. It emphasizes the need to shorten the "window period" between infection and detection to help control spread and manage the infections.