Bovine Parainfluenza-3 Virus (BPI-3V) is one of the most viral agents that causes respiratory diseases in beef and dairy cattle. This study is considered the first study in Iraq to evaluate some clinical and some epidemiological features of BPI-3V infection in cows and investigated the presence of the virus by using direct enzyme linked immune-sorbent assay (ELISA) and Real-Time quantitative reverse transcription polymerase chain reaction Real-Time RT-qPCR based on primers and Taq-Mam probe specific for nucleoprotein gene of BPI-3V according to National Center for Biotechnological Information...