Samiksha Jaiswal (Editor)

Actinomyces israelii

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Covid-19
Domain  Bacteria
Genus  Actinomyces
Phylum  Actinobacteria
Rank  Species
Family  Actinomycetaceae
Scientific name  Actinomyces israelii
Higher classification  Actinomyces
Order  Actinomycetales
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Similar  Actinomyces, Bacteria, Actinomyces naeslundii, High GC gram+, Nocardia asteroides

Medical video lecture actinomyces israelii microbiology


Actinomyces israelii is a species of Gram-positive, rod-shaped bacteria within the Actinomyces. Known to live commensally on and within humans, A. israelii is an opportunistic pathogen and a cause of actinomycosis. Many physiologically diverse strains of the species are known to exist, though all are strict anaerobes.

Contents

Lab or diagnostic findings actinomyces israelii


Pathogenesis

Actinomycosis is most frequently caused by A. israelii. It is a normal colonizer of the vagina, colon, and mouth. Infection is established first by a breach of the mucosal barrier during various procedures (dental, gastrointestinal), aspiration, or pathologies such as diverticulitis. The chronic phase of this disease is also known the "classic phase" because the acute, early phase is often missed by health care providers. This is characterized by slow, contiguous growth that ignores tissue planes and forms a sinus tract that can spontaneously heal and recur, leading to a densely fibrotic lesion. This lesion is often characterized as "wooden". Sulfur granules form in a central purulence surrounded by neutrophils. This conglomeration of organisms is virtually diagnostic of A. israelii.

References

Actinomyces israelii Wikipedia


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