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Mama is pretty much on the money with her answer. All reptiles have some species of bacteria in the Salmonella group in the digestive tract, it's beneficial gut fauna for them. If their enclosure is kept clean, there is very little risk. You actually have more risks involved in cleaning the average cat litter box.
That said, good hygiene goes a long way. I wash my hands after cleaning any reptile enclosures, and after cleaning litter boxes. And before cooking anything, no matter what I've touched. Not to overstep any boundaries here, but if she's not washing her hands before starting work in the kitchen, the iguanas are far from the biggest problem she may have.
Add Manda said though, it is not ON them, unless they are rolling around in feces constantly. And Salmonella doesn't have a particularly long life span outside in open air. The reason its far more common in turtles, is it does have a much greater chance of survival in warm water, as in a turtle enclosure, and the turtle would be swimming in it constantly, so if the water is not cleaned regularly, the turtles body could be covered in it possibly.
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