The Berry Virus is a virus that causes a slow but steady increase in the patient's body weight, with the belly and chest area being the most effects. Once the body is completely red, the patient fully transforms into one of the Berry Virus Furries, becoming a infectious creature that can spread the virus through bite, rubing belly, hug and licks. Despite the drastic physical and mental changes, the patient does not die. but the infection continues to make them fatter even after transformation