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During pregnancy, it's wise to generally avoid sprouts, although the risk of listeria is probably small. Similarly, avoid shrimp or other seafood that isn't cooked or well preserved after cooking.
That said, the risk of listeria is probably low. If you develop illness from listeria, you'll usually get flu-like symptoms. If that occurs, see your doctor for possible treatment.
In general, it's not recommended to treat pregnant women for listeria unless there are symptoms.
Although there can be a lot of publicity about listeria in pregnancy, it's actually pretty rare.
Symptoms usually show up 2-30 days after exposure. The most common symptom is fever.
Cooked shrimp is considered safe. I don't think there is much relationship between listeria infection and a fishy taste.
Yes, it's rare to cause issues.
Mostly avoid hot dogs, luncheon meats, unpasteurized milk or cheese. Keep produce refrigerated. Cook whenever unsure about food safety.