Well listeria is extremely rare - but there is a risk. It's down to the individual whether they take it or not. I accidentally ate pate when pregnant and worried myself silly - so I wouldn't eat the ice cream.
Fat chance marthamoo! Have been told there is ice-cream in the freezer and syrup in the cupboard..it was worth a try!
DH would not buy a cone from the van for same reason as was mentioned about ice-cream van bloke not washing his hand after using the bathroom! DH said there are vans where they hand you the cone in a napkin/serviette/tissue. Said this one didn't so opted for the tub.