Its also worth keeping in mind listeria is a bacteria that is everywhere. In soil on fruit and veg etc, not just in the high risk foods. There are just the risk of higher concentrations in these foods which becauae of compromised preggo immune systems puts you at higher risk. General hygiene and food hygiene are also recommended in conjunction to high risk food avoidance. So you could avoid all these foods and still contract it if unlucky enough. The bacteria being everywhere means you would have some resistance I think to the infection, which is probably why cases are rare.
However common sense is all thats needed I think. No need to panic about things, and each person is entitled to make their own decisions about what is right for them.
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