Neha Patil (Editor)

Actinomyces naeslundii

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Kingdom  Bacteria
Genus  Actinomyces
Phylum  Actinobacteria
Rank  Species
Family  Actinomycetaceae
Scientific name  Actinomyces naeslundii
Higher classification  Actinomyces
Order  Actinomycetales
Actinomyces naeslundii SortaseCatalyzed Assembly of Distinct Heteromeric Fimbriae in
Similar  Actinomyces, Bacteria, Actinomyces israelii, Streptococcus sanguinis, Streptococcus oralis

Actinomyces naeslundii is a Gram-positive, rod-shaped bacterium found in the mouth of humans. The species has been implicated in periodontal disease, as well as various tooth cavities. In other cases, A. naeslundii is associated with good oral health. It is one of the first bacteria to occupy the oral cavity and colonize the tooth's surface. It has also been isolated from women with bacterial vaginosis.


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A. naeslundii appears Gram-positive and pleomorphic by microscopy. It does not form spores, and is considered anaerobic or microaerophilic.

Actinomyces naeslundii Actinomyces naeslundii MicrobeWiki

In 2009, the species A. naeslundi was split. Bacteria formerly known as "Actinomyces naeslundi genospecies 2" were reclassified under the new species name Actinomyces oris. Those formerly known as "Actinomyces naeslundi genospecies WVA 963" were reclassified as Actinomyces johnsonii.

Role in disease

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Many species of the genus Actinomyces, including A. naeslundii, cause a chronic disease called actinomycosis, which is characterized by swelling and formation of an abscess which may exude pus. This can be accompanied by tissue fibrosis.

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Infections of the mouth, face, and neck are the most commonly recognized infections; however, the thoracic region, abdomen, pelvis, and the central nervous system can also be involved.

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Actinomyces naeslundii Wikipedia

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