Hi I have a small flock of 4 chicken, used to be 6, one got taken and the other just dropped dead! I now have a sick chook and didn't realise her fluffing of feathers was a sign. She has been sick for over a week, I think its Coccidiosis, is it too late to treat. Location is Melbourne, Australia, season is Autumn, weather is variable but days are mostly warm at least 20 Celsius to 28. Any help appreciated.