All labyrinth fishes (Bettas & gouramis) can get the gourami Iridovirus. However, as mentioned above, they need to be exposed to it to catch it. The Iridovirus gets shed by contaminated fish and the virus can remain in the aquarium for months after the fish have gone. If you add other labyrinth fishes to a tank that has had the Iridovirus, then those fish will probably catch it.
Dwarf gouramis (Colisa lalius) and all their colour forms are the most common fish seen with the Iridovirus because it is in the breeder's ponds. The breeders are unwilling to scrap everything, disinfect their set ups and get new fish. So they just keep breeding and supplying contaminated fish.
Honey gouramis (Colisa chuna) usually come from different suppliers that don't usually have the Iridovirus in their system. The same with a lot of other types of gourami. Some gouramis are wild caught and these are normally free of the virus too.