MS, how common is it?

[SquawksALOT]

Recently purchased eggs and a pullet $$$ from a Facebook NPIP breeder. Pullet arrived congested and sneezing. After quarantine and observation I decided to have an avian vet come to the home to take a look. Vet confirmed symtoms and we agreed on running some labs. Labs results confirmed the pullet has MS. My main concern is the eggs that hatched...

How likely will these 13 chicks carry the MS disease?
Should I have them tested?
Does NPIP test for MS? If not, why not?`
Is culling my only option? I do not want to spread disease.

 

[coach723]

Mycoplasma is very common globally. Most sources say that 65% of the globes flocks are infected with it.
This article may help:
https://backyardpoultry.iamcountryside.com/feed-health/the-truth-about-mycoplasma-and-chickens/
I'm not knowledgeable at all about whether any of the natural treatments in the article are actually effective.
There are loads of articles on mycoplasma in chickens, I would do some reading before making any decisions.
Some people choose to cull, wait a period, and start over with new birds. Others continue and manage it as well as they can. It is very contagious so it's generally recommended to have a closed flock. Any new birds brought in will be exposed. No birds should leave. Tylan and Tylosin are commonly used to control the symptoms when they occur, recurrence is common particularly during times of stress. The disease can also weaken their immune systems so other illness may have an easier time getting hold in them as well. If you have had one test positive then you would just consider all of them in your flock exposed. If the chicks came from an infected bird, then they can hatch with mycoplasma infection, it can be passed from the mother into the embryo. I've no knowledge of NPIP rules etc, but I do know that not all people who sell chickens are reputable or responsible. If you got sick birds from a NPIP seller then I would contact your states NPIP program and speak to them.