Clinical symptoms: loss of appetite – loss of body weight – lagging behind the normal growth schedule – cough and sneezing – decrease in egg production – increase in the loss of the body’s response to vaccination against ND and IB diseases – respiratory sounds and breathing with the mouth open It is observed that birds increase their sensitivity to stress and especially to fear, the discharge of seromucous secretions from the eyes and nose, and in this case the face becomes puffy.
Dissection symptoms: the upper parts of breathing are involved in CRD. In this case, we will have catarrhal secretions or exudates in the sinuses and trachea.
Clinical symptoms in complex CRD: clinical symptoms in this case, in addition to the symptoms mentioned in CRD, include cyanosis of the crown and beard (due to hypoxia), swallowing air, and death in chickens. (The cause of death in chickens is suffocation)
Dissection symptoms in CRD complex: In addition to the symptoms mentioned in CRD men, the presence of cheesy pus in the air sacs-thickness and swelling of the air sacs-perihepatitis-pericarditis and salpingitis (oviduct inflammation) are also seen.
Diagnosis: The fastest method to diagnose the disease is to use the S.P.A (Serum.plate.Agglutination) method. In this method, a drop of the bird’s serum is placed on the slide, and then mycoplasma antigens are added to it. If agglutination (clotting) occurs within less than 2 minutes, the sample is positive, that is, flock to mycoplasma or C.R.D. is infected
This post is written by Mohammadkhojandy