In Florida, the NPIP program will test and necropsy your sick birds for free. Here are the state certified labs in all states so you can have your birds tested if you suspect illness. They want the bird double bagged and kept cool (like in a cooler on ice) not frozen for necropsy,
http://www.aphis.usda.gov/animal_health/animal_dis_spec/poultry/downloads/labs_app.pdf
This is also an excellent article on chicken illness and diseases from APHIS:
http://www.aphis.usda.gov/animal_health/birdbiosecurity/downloads/webinar_questions.pdf
http://www.aphis.usda.gov/animal_health/animal_dis_spec/poultry/downloads/labs_app.pdf
This is also an excellent article on chicken illness and diseases from APHIS:
http://www.aphis.usda.gov/animal_health/birdbiosecurity/downloads/webinar_questions.pdf
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