[Blackbird]

Hello folks - am new to this part of the forum and would welcome some advice please. I've had 6 ex-batt hens since July. 5 are fine, one is listless with a drooping purplish comb and white diarrorhea since yesterday. I'm thinking coccidiosis? I have some Baycox left over from treating my lambs last year. Would this do the job? Any other potential causes? Also, would the condition pass to my other hens? Any advice gratefully received, thank you.