"Normal flora" include Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, and anaerobes such as Bacteroides species, anaerobic gram-positive cocci, and Fusobacterium species.

Microscopic analysis revealed Gram-positive rods for S1, S4, S7, S10, M5, M6, and M7, Gram-positive cocci for S2, S3, S5, S6, S8, S9, M1, M2, M3, and M4, and Gram-negative rods for M8 and M9. The ...