Oral-cavity infections are generally understood to advance through three stages.The three stages are (1)mixed aerobic and anaerobic infection, (2)aerobic infection,and (3)anaerobic infection.In what order do these stages occur?

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The organisms responsible for a dental infection are primarily aerobic gram-positive cocci,such as Streptococcus viridans.After a short time,the gram-positive infection begins to include a variety of both gram-positive and gram-negative anaerobic organisms,such as Peptostreptococcus (Peptococcus)and Bacteroides (Porphyromonas and Prevotella species).At this point the infection is termed a mixed infection.Over time,the proportion of organisms that are anaerobic increases.The other choices do not correctly depict the sequence of development of an oral cavity infection.

Oral-Cavity Infections Are Generally Understood to Advance Through Three Stages