Although Mycobactrium is not impossible and definitely out there many disease have curved spine..
The fact alone that the infected fish is gourami leads me in a whole different direction...
Look into Dwarf Gourami Iridovirus [DGI]..
I will bet this is the issue simply because it is way more common and over 25% of the gouramis from Asia are already infected before they even ship them..The signs for DGI can take up to year to present so many don't want to think their gourami is the sole culprit.....
Euth the fish and keep a close eye on tank... Just my opinion....
I've had fish that developed curved spine in the past and it was horribly sad to watch them waste away so I went ahead and euthanized my Gourami...
I'll look more into other possible diseases that cause curvature simply because the cyst on my fish didn't match up with those found on fish affected with TB. Just overly cautious because tb can apparently resemble non human transferable diseases like hole-in-the-head.
As far as DGI...I don't think that was a culprit? He had a cauliflower looking cyst on his lip that would flake of and regrow that responded well to salt baths but ultimately regrew bigger and started to deform his mouth. He had no abdominal swelling, ate like a pig in spite of the cyst, and had full coloration till the end (which makes me wonder if it wasn't tb since that causes acute anemia). He didn't develop any symptoms until 4 months after purchase which is in line with both TB and DGI unfortunately.
Thanks for the advice and the input. I'm going to do more research and continue to keep an eye on my tank.
If the others develop any TB symptoms I'm going to take it as a loss and wipe and start again
I wasn't aware of DGI or the 25% factor–thanks for the info, C-Bandit, I hope it's just that and not tuberculosis.
That sounds likely, BUT...if there is a chance that it is fish tuberculosis, that can be transmitted to you, especially if you have even a tiny scratch on your skin that comes into contact with the water, so take proper precautions, as in long gloves, tongs other tools that keep your hands out of the water (don't cross-contaminate your other tanks with shared unsterilized tools), and be sure to wash your hands/arms after dealing with that tank.
That could be paranoid overkill, but, hey, why risk it if you think there's a chance that it is tuberculosis?
Good luck with whatever it is.
Human infections of Fish TB looks horrible, but from the various accounts I've been reading it sounds like the disease is pretty difficult to contract unless you are playing in tanks with large wounds or abrasions on your arms or hands. Most folks that had confirmed cases of it had rather large wounds on there hands upon contracting the disease. One infected person that stands out in my mind had a massive cut underneath a wedding band which is a contaminate nightmare. Washing hands isn't enough to sanitize because alot of diamond rings have nice caverns (makes the stones sparkle) that acts like cradles for germs.
That doesn't mean I'm going to be flippant with safety though.
I will be using rubber gloves and washing then bathing my hands and fore arms in hand sanitizer when doing maintenance on my tank for the time being.
The more I read into the disease the more I'm unsure of the diagnosis but I will be careful until I'm sure.
Thanks for the input and the concern.