Hi javaqueen,
It would be very rare that latex in mattresses can cause an allergy issue because most latex allergies are contact allergies and there is generally no contact with the latex in a mattress. Foamed latex is also very different from dipped latex that is used in products like gloves, condoms, balloons which are the most common causes of latex allergies because most of the surface allergens are washed away during the manufacturing process. There is more detailed information about latex sensitivities and allergies in post #2 here.
Phoenix