Food allergies -Italy

In Italy every place must supply to the customer a list of ingredients contained in the food and even the risk of cross contamination of allergenic substancies.
As "any place" I mean restaurants, bars, groceries, malls supermarkets and so on.
Sometimes allergenic substancies are clearly listed in the menu, but is not mandatory. In any case you can ask to the waiter and he/she checks in the list registered if there are some allergenic substance. Or consult the chef about it.
Best suggestion, as other do, is to create a little "business card" written in different languages to show where you go to check if everything is OK. The most tricky ones are eggs, because are very used as ingredient in several recipes in Italy.

I wanted to share an experience I had on a river cruise in Europe so you are aware. I told the chef I had a shellfish allergy but I could eat fish. One night the entree was a fish with mussels. When I sent it back stating my allergy they argued that mussels were not shellfish. Of course I would not eat them. So——be aware that the definitions between countries may be different than ours. Be extra cautious.

revelssn makes an interesting point: when you make a card to show servers and cooks, you might need to be specific about exactly which items your son is allergic to. I have a good friend who has to pull out the epipen or head to the emergency room if she has even a smear of sauce from her husband's shrimp or lobster, but she can eat mussels and oysters. My nephew can eat peanuts, but not soybeans.

And so on.

Or it may just be safer, and simpler, to use broad categories. But when people have different cognitive categories for "seafood" or "nuts," the results could be tragic.

Thanks all! The card I have in Italian lists every nut individually.

it Would be safer to write "frutta con guscio come: " before the list of nuts. There are many.

I cant eat shellfish either. When we were on RS tour, the Italian speaking tour leader (while arranging meals with the restaurants) had to spell out examples (no polpo, no cozze, etc.) but we found it to be just easier to just say "no fruitti di mare" (no seafood). Maybe in Italian, there is no comprehensive word that covers shellfish as we understand the term?.

Neither Polpo (octopus) nor mussels and clams are considered shellfish in Italy. "Frutti di mare" means molluscs, not the same league of crustaceans. If you said "No frutti di mare" to an italian waiter he would not offer you any molluscs, but he could ask if you want some lobster instead.

There is a comprehensive phrase for nuts, It's "frutta con guscio".

I’m traveling with my daughter, who has severe peanut allergy, to Florence and Pisa in a couple of weeks. I made a reservation at the Trattoria ZaZa after checking their menu, which is very traditional and doesn’t show any nuts. Nevertheless, I messaged them to confirm. They replied and said they do use peanuts in the kitchen. So I have to cancel the reservation for fear of cross contamination.
Does anyone have good recommendations of true peanut free restaurants in Florence and Pisa?
By the way, foodallergy.org has allergy cards in different languages you can print out. https://www.foodallergy.org/resources/food-allergy-chef-cards
Many thanks for your suggestions.

Peanut oil is used to fry these days, traditional or not a peanuts-free restaurant could be quite difficult to find.

Thank you very much, Dario. Peanut oil is supposed to be fine as it doesn’t contain peanut proteins. However, we still avoid it in case of a trace of peanut protein is in the oil. We will avoid fried foods and ask the servers and chefs everywhere we go.

Not that I can help specifically, but with food intolerances and travel, I found Googling for blogs of travelers with similar allergies can be very helpful. They give tips, often mention restaurant names, explain the ease of functioning in specific countries.

@MariaF, thanks for the suggestions. Here are some sites I hav found. Hopefully they are helpful to someone facing similar situations.
1. Florence allergy-friendly travel guide: https://www.spokin.com/food-allergy-friendly-florence-italy-travel-guide
2. https://missallergicreactor.com/traveling-with-food-allergies-to-florence-italy/