What role does Lactococcus lactis play in delivering the oral vaccine effectively?

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Lactococcus lactis Acts as a Protective Delivery Vehicle for Oral Fish Vaccines

Lactococcus lactis plays a crucial role in the effectiveness of the novel oral vaccine by acting as a protective shell for the virus-like particles. These bacteria shield the vaccine components from the harsh acidic environment of the fish's stomach, ensuring their safe passage to the intestines where they can be absorbed and trigger an immune response. This mechanism is vital for protecting young fish, which are too small for traditional injection methods, against devastating viral infections like nervous necrosis virus.
Protection Against Stomach Acid

The virus-like particles, designed to mimic the nervous necrosis virus without containing any genetic material, are vulnerable to degradation by stomach acid. By encasing these particles within Lactococcus lactis, researchers have created a robust delivery system. This bacterial wrapping effectively safeguards the vaccine components, preventing their premature breakdown and allowing them to reach the intestinal tract intact.
Targeted Delivery to the Intestines

Upon reaching the intestines, the Lactococcus lactis releases the virus-like particles. This targeted delivery ensures that the vaccine components are exposed to the fish's immune system in the appropriate location. The immune system can then recognise these particles and initiate the production of antibodies, including neutralising antibodies that are crucial for combating the actual pathogen upon exposure.
Enhancing Immune Response Potency

The protective action of Lactococcus lactis has been shown to significantly enhance the vaccine's efficacy. Studies indicate that the protected version of the vaccine, delivered via this bacterial vehicle, resulted in doubled antibody levels compared to unprotected particles. Furthermore, in laboratory trials on grouper, this method led to a reduction in viral load in the brain by approximately 300 times after exposure to the virus.

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What role does Lactococcus lactis play in delivering the oral vaccine effectively?

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