Oh yes! Very contagious, in fact, it can be epidemic-rate contagious! Koro is a delusional-disorder in which an individual has a sudden overpowering belief that one’s genitalia is retracting and will disappear; despite the absence of any physical alteration in his, or hers, genitals. In other words, they see the change even when it doesn’t exist
In women, it manifests in a conviction that their breasts and/or genital organs, shrink and will lead to death, no less.
If you find Koro a little strange so far, get ready for the really bizarre part – although a mental delusion, Koro acts and spreads like a plague. It can appear in one individual and soon “infect” his entire village.
The largest recorded Koro outburst was in China between 1949-1948. The epidemic lasted for more than a year and was evident among more than 3,000 people living in 16 different cities and districts.
Koro is mostly observed in Southeast Asia and Africa, where the disease outburst is often interpreted as genitalia theft by witches hired by personal enemies.