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No, you don't need to treat the ground, as it is present everywhere and there's no way to prevent reinfection. You simply have to give their digestive system a break so that their immune system can learn to recognize the oocysts and defend them in the future.
To buy some time, old farmers here recommend giving them a mix of 50% dry milk and 50% feed. This helps to block some of the damage and purge the oocysts until you can get them the Amprolium (several brands are available) and that is just a Thiamin blocker- but it incapacitates the coccidia without hurting them or weakening them the way other drugs might. If you can't find any Amprolium (Corid, Amprol, or even some other form of coccidiostat) you can use Sulmet, a Sulfa-based antibiotic. No other antibiotic will work, as we aren't dealing with a bacteria, but rather, an amoeba. It is, however susceptible to sulfa, so that will often work, but it weakens the bird and destroys the colonies of beneficial bacteria within their intestines, so you MUST feed them probiotics or live-culture yogurt during their treatment and for a week following. You must run a full course of whatever treatment you choose, even if they appear better. Keep their litter dry and clean, and feel free to use a preventive dose of Amprolium for the next month (1/2 dose after a week of full-dose treatment) to help them develop immunity.
Good luck!!
