if some of your birds were vaccinated, treating them with corid will defeat the purpose of the vaccination.
"The vaccine is actually a live, mild strain of coccidia that stimulates chicks’ immunity to natural infection with more aggressive versions of coccidia. After vaccinating chicks, don’t...
hello @Emily94 - welcome to BYC :frow
Take a deep breath! 1st, coccidiosis is everywhere and is not normally fatal. When first exposed a bird may be under the weather for a day or three, but then gets over it.
2nd it's a good idea to quarantine ANY new birds on your property for at least 2...