Diagnosis of Leptospirosis in haemorrhagic fever in domestic animals of the Helleh River area in 2004 by polymerase chain reaction (PCR) molecular technique oleh Roya Amiri nejad, Katayoun Vahdat, Iraj Nabipour, Seyed Mojtaba Jafari, Amrollah Ghajari, Reza haji Hoseini, Seyed Javad Hossainy, Keyvan Zandi, Mohammad Hadi Zafarmand