(Gresham, OR) -- Health officials are issuing yet another warning about a measles exposure in the Portland area. The Oregon Health Authority says the exposure happened at the Mt. Hood Community College Gresham Campus Academic Center Building 17, main level, on Monday April 13th from 10 a.m. to 1:50 p.m. Anyone who may have been exposed should contact their health care provider to check their immunization status.