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Once they get through an outbreak like this of cocci, they become highly resistant to that strain and will likely not ever have the problem again. If they move to a new location, there is a greater risk because they could encounter new strains of cocci that they are not resistant to.
Also, i have had quite a few chickens pooping blood and recover fully. The key is to medicate as soon as possible. I always keep Corid on hand at my house. And make sure you medicate all your chicks, whether they're looking sick or not. All the chicks of the same age have likely been exposed to the exact same microorganisms. Medicate them all.
Until your mom gets home from work, you can help ease their pain by feeding them yogurt if you have any on hand. Even some milk mixed with their feed - into a wet mash - will also help. The milk products help them produce more mucous in their intestines that helps alleviate the stress the microorganisms are placing on them.
Once they get through this, it is also not necessary to feed them medicated feed anymore. The medication will do them no good at all.