Pregnancy is the most beautiful experience a woman can have, with the onset of pregnancy female body undergoes many changes, one of them is the reduce in the immunity. After the implantation is done female immune system is suppressed to make the fetus growth safe.
Due to this change the female body gets vulnerable to many bacterial agents. The major intake of bacteria goes through food; hence there have to be restrictions on what you are eating. But as it is hard to stop cravings for food during pregnancy, food have to be checked thoroughly whether it is completely sterile and infection free before consumption.
The major bacteria which effect at the time of Pregnancy are E. Coli, Listeria, Salmonella, Vibrio bacteria these cause stomach infections and side effects which pose threat to both baby and Mother.
These bacteria are mostly present in Cheese, eggs, milk products, sea food specially shell fish, meat and red meat, ice creams, salads and sprouts.
Avoiding these foods is not possible so these have to be cooked and pasteurized or micro waved until they are infection free.
The following info graph illustrates you completely about these foods.