User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5043481-20140922220945/@comment-6050823-20140927004947

Through inhalation of its hairs/scales and from the inhalation of whatever substance/fog Shagaru Magara produces, which the virus causes some abnormalities in the nervous system, increased physical strength, and a decrease in the body's resistance, making most monsters extremely violent.

Sorry for the late reply!