Iridovirus disease affecting dwarf gourami

i have been reading up on the web about this disease and was wondering has anyone come across it?
one of my dwarf gourami has started get very thin and looks like he is wasting away, he has got very slow and spends most of the time hiding near the top, he is still eating but more picking than gulping it down, water is fine, no other visable signs of any disease and other DG's are fine.
any info would be great..
thanks...

"Dwarf Gourami Iridovirus (DGIV)
The quality of the dwarf gouramis in the trade has steadily declined for years, with batches of fish showing significantly higher levels of mortality than 10 years ago. Historically, retailers and aquarists have blamed bacterial infections, such as fish tuberculosis (Mycobacterium marinum). In recent years, though, attention has focused on a virus known as dwarf gourami iridovirus or DGIV.

Dwarf gourami iridovirus is apparently specific to the dwarf gourami (Colisa lalia), including the various fancy varieties of the species, such as neon gouramis and sunset gouramis. Infected fish develop a variety of symptoms, including loss of color, decrease in activity and appetite, the appearance of sores and lesions on the body, abdominal swelling and finally death. This fish disease is highly contagious, completely untreatable and invariably fatal.

Dwarf gourami iridovirus is apparently very common. One recent study of fish exported from Singapore found that 22 percent of all dwarf gouramis carried the virus. Aquarists should never purchase dwarf gouramis from fish tanks containing fish exhibiting symptoms consistent with the dwarf gourami iridovirus, and all new fish should be quarantined for at least six weeks prior to being placed in the main fish aquarium.

For most aquarists, my best advice is to keep the hardier alternatives to dwarf gouramis. The thick-lipped gourami (Colisa labiosa) and the banded gourami (Colisa fasciatus) are both similar in size, temperament and coloration and make excellent alternatives". (as taken from fishchannel.com an article By Neale Monks, Ph.D)

how long do you have your dg, if it's an old fish and as it's highly contagious i'd say you would have seen signs the others have it. they can be aggressive towards each other maybe this could be a factor, stress, old age? how's your water?

i only have it 3 months, bought 3 in total the other 2 are fine, i havent seen any of them being overly aggressive towards him either, he will even feed from my hand?? water is fine, tested an changed every week,, so i just dont know????

well 3 months is longer than quarentine time so i'm going wit this is not the disease