Ian Tizard, BVMS, PhD, DACVM

Ian Tizard, BVMS, PhD, ACVM, ScD, is a Diplomate of the American College of Veterinary Microbiologists and a Distinguished Professor of Immunology at Texas A&M University (TAMU).

Article 

Avian Bornavirus and Proventricular Dilatation Disease: Facts, Questions, and Controversies

Proventricular dilatation disease or PDD is one of the most frustrating avian conditions encountered today. The recent discovery of a causal relationship between PDD and avian bornavirus has not simplified the challenges that are faced. The detection of avian bornavirus infection is common in birds with PDD but is also detected in birds with other chronic diseases that are not diagnosed with PDD. Proventricular dilatation disease was first reported in the late 1970s…