Hello , i have a little bantam chicken , a hen, she started to cough and sneeze and scratch her beak, no other synmptoms, my treatment was: deworm with Flubendazole-after this treatment she reduce her cogh and sneeze but after one day she begun again to cough , i use tylan this time combined with erythromycin thiocynate - no results she coughing and sneeze , please help, i think its not a respiratory diesease, please give me an advice, thank you in advance!