Transmission
Transmission of the parasite P. westermani to humans and mammals primarily occurs through the consumption of raw or undercooked seafood. In Asia, an estimated 80% of freshwater crabs carry P. westermani. In preparation, live crabs are crushed and metacercariae may contaminate the fingers/utensils of the person preparing the meal. Accidental transfer of infective cysts can occur via food preparers who handle raw seafood and subsequently contaminate cooking utensils and other foods. Consumption of animals which feed on crustaceans can also transmit the parasite, for cases have been cited in Japan where raw boar meat was the source of human infection. Food preparation techniques such as pickling and salting do not exterminate the causative agent. For example, in a Chinese study eating "drunken crabs" was shown to be particularly risky because the infection rate was 100% when crabs are immersed in wine for 3–5 minutes and fed to cats/dog.
Read more about this topic: Paragonimus Westermani