I'm not sure how common false negatives are either, but they do happen. Four years ago someone with a critically ill peahen posted saying they had a negative fecal, but three days later decided to have another done, and this time they found capillary eggs and coccidia.Well she was vaccinated I’m told for the Coccocidiosis though that’s what I took The stool in to be checked specifically for.... I don’t know about a false negative and if that’s common?
Pet safe is Fenbendazole If I’m spelling it correctly… I have been treating them with that for five days, half cc.
I know nothing about the vaccine and how well it protects them against all strains of coccidia.
