A disease, normally affecting women, whereby the sufferer finds herself
inexplicably and totally attracted to men with red or "ginger" hair. The disease, which has no known cure as of yet, is normally
acquired after one has a severe
infatuation with a particularly attractive and sexy ginger, leading the sufferer to believe ALL red-heads are equally attractive.
Girl 1: OMG i have a bad case of the gingervitus, i keep seeing ridiculously sexy
redheads everywhere i go! i don't know what to do!
Girl 2: Ah the same thing has been happening to me ever since i saw that sexy beast
Rupert Grint in
Harry Potter and the half blood prince.