Thanks

I don't know the movie but I think the disease is chimera if that helps at all

Dennyt - was the movie old? Long shot, but maybe Murder He Says? Some of the characters had been poisoned, and glowed in the dark...
....The Fleagles try to poison Claire at dinner, but Pete accidentally discovers that all but one of their plates have been poisoned (the poison glows in the dark)....
Murder, He Says - Wikipedia, the free encyclopedia