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Prevotella intermedia is the bacterium that has been identified as being associated with increased levels during pregnancy gingivitis. During pregnancy, hormonal changes, particularly an increase in estrogen and progesterone, can alter the oral environment. These changes can promote the growth of certain bacteria, including Prevotella intermedia, which is known to be implicated in periodontal diseases.

The presence of this bacterium enhances the inflammatory response in the gingival tissue, exacerbating symptoms of gingivitis that may be especially pronounced during pregnancy. Research indicates that this bacterium may be more prevalent in pregnant women, contributing to higher rates of gingival inflammation and worsening oral health.

In contrast, other bacteria listed, such as Actinobacillus actinomycetemcomitans, Streptococcus mutans, and Treponema denticola, are associated with different forms of periodontal disease and tooth decay rather than specifically with pregnancy-related gingivitis. Their roles in oral health and disease are significant but do not specifically align with the increased incidence of gingivitis during pregnancy as seen with Prevotella intermedia.