Has anyone ever heard of VetRx Poultry Remedy? It says its for the temporary relief of symptoms caused by resp infects, colds, wheezing, and sniffles. My BO has been coughing, sneezing, and wheexing really bad for about a week now. My wife bought this VetRx stuff from our Southern States dealer. Do you think its worth it since its only temporary relief or should I cull her now and prevent the spread of it to the flock?