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Weather does not in and of itself cause illness. However, it can foster conditions that make it more likely for clinical level of illness to develop. Weather extremes cause stress, and stress lowers immunity. Lower temperatures can prolong the life of germs that would die under higher temperatures. I do not believe silkies are any more prone to illness than any other breed. A specific LINE may perhaps be, but there are none that I am specifically aware of. Your best bet at preventing illness is keeping your birds immune system built up, making sure they have a dry, well ventilated (but not drafty) coop, clean water, quality food.