[[File:actinomyces.jpg|right|thumb|250px|<small><center> Agar plate culture of ''Actinomyces'' sp. bacteria, a Gram positive opportunistic pathogen of the oral cavity. (Marco Tollo 2006, Wikimedia commons)</center></small>]] | [[File:actinomyces.jpg|right|thumb|250px|<small><center> Agar plate culture of ''Actinomyces'' sp. bacteria, a Gram positive opportunistic pathogen of the oral cavity. (Marco Tollo 2006, Wikimedia commons)</center></small>]] |