Pigeon is one of the birds that in addition to have a special place in our civilization, is important in Islam religion too. There are lots of pathogens that sickens this bird, including viruses. In this research we focus on pigeon Adenovirus, pigeon Circovirus and pigeon Herpesvirus, which are three most important viruses in pigeons. All of these viruses have a major role in Young Pigeons Disease Syndrome, which have common symptoms such as diarrhea, vomiting, lethargy, respiratory distress and depression, and have no separate and pathognomonic sign. One of the methods to detect these viruses in pigeons is polymerase chain reaction that used in this research. Sampling was performed from liver of dead pigeons during four years from 2011 to 2015 in veterinary hospital of the Ferdowsi University of Mashhad, Iran. Total genome of samples was extracted, and histopathological slideswere prepared according to their specific protocols. In this research, for the first time, presence of adenovirus in 15.5%, circovirus in 100%, and herpesvirus in 22.5% of pigeons that studied in Mashhad were proved. To author's knowledge this is the first report in Iran. To find out exact prevalence of these viruses in Iran, more researches with larger population and throughout the country are necessary.

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