Listeria
If you are pregnant, avoid sushi. The mercury is bad for your fetus and listeria is even worse. Listeria is a bacterial infection from eating contaminated food, including raw fish.
Pregnant women, newborns, and people with compromised immune systems are at risk. Symptoms include headaches, stiff neck, confusion, and convulsions. Pregnant women may miscarry, have a stillbirth, or the newborn may be very sick.
You can develop listeria the day you eat bad fish, or it can develop up to seventy days later.