(Portland, OR) -- Oregon health officials are reporting a measles case at the Canby Rodeo in Clackamas. According to the Oregon Health Authority, the exposure happened between 7:30 and 11 p.m. on August 20th at the Clackamas County Fairgrounds. Anyone who was at that location at that date and time period is asked to check vaccination records and monitor for symptoms of measles. There have been at least 46 measles cases reported in Oregon since the start of the year.