According to Beydoun et al. [30], Pg, Pi, P. nigrescens (Pn), Fn, Cr, S. intermedius (Si), C. ochracea (Co), and P. melaninogenica (Pm) could be related to increased AD mortality risk above 65 years of age, while the reverse could be true for Aa. This evidence concerns the gene FN1 and Alzheimer disease.