Chicken respiratory diseases are difficult to differentiate and may not be diagnosed based on respiratory signs and lesions. Other diseases such as mycoplasmosis by "Mycoplasma gallisepticum" (chronic respiratory disease), Newcastle disease by mesogenic strains of Newcastle diseases virus (APMV-1), "Avian metapneumovirus", infectious laryngotracheitis, avian infectious coryza "Avibacterium paragallinarum" in some stages may clinically resemble IB. Similar kidney lesions may be caused by different etiologies, including other viruses, such as infectious bursal disease virus (the cause of Gumboro disease) and toxins (for instance ochratoxins of "Aspergillus" "ochraceus"), and dehydration.