-disease from guinea pig wont affect human.. but fungus/ringworm wise --> it is a two way thing.. u can affect them.. them can affect u..
lice and mites wont jump host..

their pee is dangerous? where u hear tat.. ? their pee will stain yes..
some might show allergy to their fur or etc.. so if u have any allergy better check it out 1st..

anyway.. my babies piggies is almost 1 month old liao... and will soon need a new home.. any1 interested pls PM me.. i got 2 piggies.. abby type.. both male