Actinomyces is a
genus of
Gram-positive bacteria. Some species are
anaerobic, while others are
facultatively anaerobic . Actinomyces species do not form
spores, and, while individual bacteria are rod-shaped, morphologically Actinomyces colonies form
fungus-like branched networks of
hyphae.Many Actinomyces species are opportunistic pathogens of humans and other mammals, particularly in the
oral cavity. In rare cases, these bacteria can cause
actinomycosis, a disease characterized by the formation of
abscesses in the mouth, lungs, or the
gastrointestinal tract.Some species are responsible for the smell of topsoil, which is often particularly noticeable after rain.
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