On May 1, 2015, the National Veterinary Services Laboratories (NVSL), confirmed findings of vesicular stomatitis virus (VSV) infection (New Jersey serotype) on premises in Maricopa County, Arizona and Kane County, Utah. Three horses on two premises in Maricopa County, Arizona met the case definition of infection with compatible clinical signs and positive complement fixation antibody titers. One mule on a premises in Kane County, Utah met the case definition of infection with compatible clinical signs and positive virus isolation. These are the 2015 VSV index cases for Arizona and Utah, respectively. Additionally, a second premises in Kane County, Utah is under VSV quarantine related to the index case. The equids involved in the Kane County, Utah case had moved from Arizona just prior to identification of clinical signs. In addition to the two confirmed premises in Maricopa County, Arizona, there are five suspect premises in Arizona under movement control for suspicion of VSV. Quarantined premises are eligible for release 14 days after the onset of lesions in the last affected animal on the premises. Since the last situation report (4/29/15), one premises in Grant County, New Mexico has been released from quarantine.