I am confident in how I am dealing with chronic mycolplasma in my younger chickens and the flock overall isn't affected by more than 10% of them getting sick (of 50 birds). It only effects my younger ones, as the older ones that had it have only get mild recurring symptoms and havent needed treatment.
First importance is keeping watch on their leaking eye in the morning, and keeping their face and eye clear of the mucous discharge. During a severe outbreak, I clean their face every morning to keep the mucous from building up causing blisters, infections, etc. Even during an outbreak, sometimes I let it go a couple of days before it needs cleaned for them. So excessive mucous needs to be kept clean.
As for antibiotics, I have a special mixture they get, so I will assume you don't have the same medicines. But I only give the antibiotics the same day of the face cleaning, if it is a severe outbreak. That is partly because I can't treat 5 minor cases every day, I only can do one or two that have mucous build ups on their face. They get antibiitics only one day, sometimes two days on a row. I never keep giving antibiotics every day, only during an outbreak and the medocine does seem to reduce the severity of the outbreak. So only give antibiotics one or two days, folkowed by monitoring the symptoms. Often time a couple of these abtiviotcs and treatments they will grow out of the symptoms and they go away for weeks or forever. Lots of my chickens only got a one or two day treatment, and symptoms went away and they are now adults with no symptoms.
The biggest thing is hygiene of theor eyes and face. Cleaning the mucous during their initial major outbreaks. Yesterday I did antibiotic treatments for two, and cleaned their faces. Today I have none to treat, and tomorrow too. Lidocaine eyedrops also help after the face cleanings, I apply eyedrops and then dry their faces with a towel, and their eyes stay clear for days.
I bought 3 chickens from a poultry show. The day after I found out that one had a bubbly eye. And was sneezing. I seperated them. Then I gave the hen back to her owners. But the others were sneezing... But I refused to give up. I didn't have anything to treat them. So I researched on what herbs were good for respiratory issues and made tea for them. I know this might sound weird... But It worked.
But they are in a flock with no issues. And the flock is healthy. I don't think there is a vet that would actually test them but as I said. It did not spread. I'm very thankfull for that
If you would like I could give you the ,,recipe" for the tea.
They get better with meds and then another cold spell and they get sick again :-( I’d love the recipe for your tea! Any extra help is always welcome! 
I got a beautiful pullet from a breeder who was unaware she was sick supposedly. She reimbursed me the cost of the chicken and gave me meds for them, but it was too late for my flock :-( I didn’t practice good biosecurity because I’d gotten others from her and stupidly thought that meant they’d all be healthy. The worst is that it’s the holidays and I can’t get a vet that won’t cost lots of
and CA requires prescriptions for all the best antibiotics. :-( I’m just hoping I caught it in time to not lose more of my babies.
