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Aerococcus varidans var. Homari in phagocytic cells of Homarus Americanus

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Factor, Jan R.
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Spring 2025
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2025
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Aerococcus viridans var. homari causes Gaffkemia, a deadly disease in American lobsters (Homarus americanus) that spreads through wounds and overwhelms the immune system. The disease, now also seen in European lobsters (Homarus gammarus), is a major problem in both lobster pounds and wild populations. This study uses transmission electron microscopy (TEM) on previously collected samples to examine how A. viridans grow inside lobster immune cells (fixed phagocytes). TEM images show that after being engulfed, the bacteria proliferate and create intracellular voids filled with an unknown substance, which may help them survive and replicate. The formation of bacterial capsules likely compresses the phagocyte's contents, creating more space for bacterial growth.
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