Once the crab dies, the bacteria in the body will multiply and decompose the crab meat, and some bacteria will also produce toxins. People who eat such crabs can cause food poisoning, and the common manifestations are nausea, vomiting, abdominal pain and diarrhea. In severe cases, dehydration, electrolyte disorder, convulsion, even shock, coma and septicemia may occur.

So when you buy crabs, you must pay attention to whether they are fresh. Don't buy dead crabs, especially river crabs, and cook them thoroughly when using them, so as to kill germs inside and outside crabs.