Psychogenetic Alterus

Psychogenetic Alterus known minutely as "Gravipersonalitasetcorporalisalteratio" is a psychogenetic illness created by YoY. The rare name derives from the latin "Gravi personalitas et corporalis alteratio" which literally means Severe Personality and Physical Alteration and is sometimes abbreviated to SPPA. 
This illness, you guessed it, alters the sufferer's personality and physical appearance. The personality alteration is caused by the destruction of the neurons inside the Basal Ganglia and then the creation and connection of new neurons, both events caused by YoY. 
The personality alteration is divided up to two types: Type 1 Alteration, also known as Opposition, announces that the personalities of the individuals who suffer from this statistically end up with a personality that is the polar opposite of their original behavior, this type is the most frequent with people who are considered to be "good-hearted". Type 2 Alteration, also known as Amplification, declares that the personalities of the individuals who suffer from this statistically end up with the same personality but is amplified to its maximum capacity, this type is most frequent with evil-hearted people. This infection worsens with time.
The physical alteration is due to the drastic change in the genes of the individual to the point where, within 20-25 years of infection they become, let's say, different. By that we mean, the individuals infected are officialy named "Gravirage" once their physical form becomes biologically beyond repair. 
The only cure for Psychogenetic Alterus is love and affection or friendship.
An individual gets infected with SPPA if it encounters YoY and they accept its "Do you want to be rich?" offer as a consequence for their naivety and greed. It is a message to say that "free" money, products, anything, does not exist.