 SCP-584 is a highly infectious viral pathogen that, if left untreated, causes a disfiguring overgrowth of supernumerary limbs. C-file photos Structurally similar to the herpes simplex family of viruses, SCP-584 spreads via direct person to person contact and through contact with infected bodily fluids, and can also cross the placental barrier from an infected mother to her fetus, resulting in characteristic birth defects. SCP-584 typically lies dormant, deep in the dermal tissue of those infected, largely suppressed by the immune system, except for sporadic outbreaks. It is estimated that upwards of 80% of those exposed to the virus are asymptomatic carriers, making actual infection rates unknowable. Current estimates place the highest rates of infection in Asia, particularly India and China, where the virus likely originated.