Long COVID (also called post-COVID-19 condition or post-acute sequelae of SARS-CoV-2 infection) is a complex, multisystem disorder that occurs after SARS-CoV-2 infection and is present for at least three months. It can be continuous, relapsing and remitting, or progressive, affecting one or more organ systems. The medical term for this is an infection-associated chronic condition (IACC).