One of our hens (just over a year old) died this morning. For the past week we noticed her comb was completely pale and flopped over. IN addition she was acting rather lethargic. We actually scheduled an appointment to take her to the University of Wisconsin Vet Hospital this morning, but she passed away before we got her there. Now ... my question ... Should I be concerned about the other hens? Should I have any diagnostic work run on her to see if the cause of death was infectious? Any tips would be great. Thanks.