On salmonella, I grew up in a poultry producing area (mostly turkeys) that has a yearly poultry festival. I've NEVER gotten food poisoning from Salmonella, and when I was on a high risk pregnancy and they did titers for everything under the sun, the perinatologist commented that I had "strong antibodies" to it. I didn't grow up handling chickens, but apparently there was enough in the air, soil, etc that I built up the sort of immunity normally seen in farm workers, just by living there.
Based on that, my guess is that having reptiles in the household may well build up the same sort of passive immunity. I would suggest having tanks in a room that can be shut/gated off with toddlers, and having any big racks and things like that tethered to the wall, because of the risk of a child pulling over a tank on top of them, which would be bad for both the child and the snake.
The one thing I'd suggest is that if you have cats (or dogs) that you shut them out when cleaning. I've heard of a couple of cases where cats have used a turtle pond or water bowl as a water dish (either with outdoor turtle pens or while changing out tanks) and other people have petted the cat and ended up getting salmonella. I shut the cats out when I'm changing tanks, especially when I'm doing a water change/refresh on the frog tanks for that reason.
I do wonder-does the pet shop have cats? If so, do they not allow pregnant women to work with them, too? Our local pet stores have areas for shelters to bring in cats/dogs to be housed in the store for adoption, so employees are changing litter etc.
