Researchers at the University of Virginia maintian that carpets are likely to have 100 times more allergens than wood floors.
(carpets; are; likely to have 100 times more allergens than wood floors) (carpets; to have; 100 times more allergens than wood floors)
carpets carpets
are to have
likely to have 100 times more allergens than wood floors
100 times more allergens than wood floors