I have a 9 month old black araucana who has been gaping for a few weeks. She is not wheezing or coughing but definitely gaping. She seems to be in good health, eating and drinking and laying lots of eggs. I have given the whole flock Aviverm (Levamisole Hydrochloride 24% w/v as an aqueous solution) a week ago, would that be sufficient to treat Gapeworm or should i be giving her something else?? She was still gaping today. Or could it be something else?? Any advice very welcome, I really don't want to lose my blue egg layer!