Maybe yes or maybe no .. becaz we can't say it's mareks until you done autospy or blood tests for confirmation
Only keep a close eye on all for seeing any similar symptoms with the earlier case
Give lots of immunity booster like e.g
• Garlic 1-2 cloves once a week or twice ( Great...
After reading all I think she have cutaneous fungal Infection weather from mites or lice
Or Some Nutritional Deficiency as far as feathers made up from Protien
But I know that all People in US
Give quality feed to their chooks which have appropriate quantity of balance nutrition
I don't want to...