Given what we know, we can confirm that by eating raw seafood, Billy runs the risk of contracting a parasitic infection.
Parasites are organisms that live inside another organism, this second organism is known as the host. The parasite steals nutrients from the host in order to survive, this often results in the death of the host if the parasite is not combated. These parasites are common amongst fish and are why Billy is at increased risk of parasitic infection by eating raw seafood.
Therefore, we can confirm that by eating raw seafood, Billy runs the risk of contracting a parasitic infection.
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