the following information is not yet verified
previously Actinomyces naeslundii genospecies 2

Taxonomy
Family: Actinomycetaceae,

Natural habitats
They are commonly isolated in the human oral cavity and play a major role in the formation of oral biofilm or dental plaque.

Clinical significance
A. oris, A. odontolyticus, and A. viscosus are the primary Actinomyces species in infants' mouths as well as in early dental plaque.

A. oris it has also been linked to root caries, periodontal disease and even opportunistic infections such as actinomycosis.