How do virus-like particles without genetic material induce immunity?

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Virus-Like Particles Without Genetic Material Can Induce Immunity

Virus-like particles (VLPs), which mimic a pathogen but lack genetic material, can trigger an immune response in fish when delivered orally. These VLPs are encapsulated within the bacterium Lactococcus lactis, which shields them from stomach acid and facilitates their delivery to the fish's intestines. Upon absorption, the fish's immune system is stimulated to produce antibodies, including specific neutralising antibodies that can prevent the actual virus from infecting cells.
Mimicking the Pathogen

The core principle of this vaccination strategy involves using virus-like particles (VLPs). These structures are designed to resemble the actual virus in form, allowing them to be recognised by the host's immune system. However, crucially, they do not contain any genetic material, meaning they cannot replicate or cause infection, thus providing a safe method for stimulating immunity.
Protection and Delivery Mechanism

To ensure the VLPs survive the harsh conditions of the fish's digestive system and reach the absorption sites, they are encased within the bacterium Lactococcus lactis. This protective bacterial shell acts as a carrier, safeguarding the VLPs from degradation by stomach acid. Lactococcus lactis then facilitates the transport and absorption of these protected VLPs into the fish’s intestinal tissues.
Immune System Activation and Antibody Production

Once the VLPs are absorbed from the intestines, they are recognised by the fish's immune system as foreign entities. This recognition prompts an immune response, leading to the production of antibodies. Among these antibodies are neutralising antibodies, which are specifically designed to bind to and block the real virus, thereby preventing it from attaching to and infecting host cells. In trials with grouper, this method led to survival rates of approximately 95 per cent in vaccinated fish compared to 60 per cent in unvaccinated fish.

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How do virus-like particles without genetic material induce immunity?

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