The BK Virus is a type of virus that belongs to the polyomavirus family. It primarily infects the kidneys and can lead to complications, especially in individuals with weakened immune systems, such as organ transplant recipients. Most people are exposed to the virus during childhood, but it usually remains dormant without causing symptoms. In some cases, particularly in immunocompromised patients, the BK Virus can reactivate and cause BK virus nephropathy, a condition that can damage kidney function. Regular monitoring and early detection are essential for managing the virus and preventing serious health issues.