1. Normal flora and opportunistic infections;Gallis,1988
2. Color atlas and textbook of diagnostic microbiology,1988
3. Microbiology of the orofacial region;Schuster,2002
4. Oral flora and pathogenic organisms;Shuster;Infect Dis Clin North Am,1999
5. Innate (general or nonspecific) host defense mechanisms;Tramont,2000