Ohio has the most cases, but Oregon has five.

Dr. Paul Cieslak is the head of Infectious Disease at the Oregon Public Health Division.

"It's on the high side.  Last year we had six cases for the year. But going back to 1996, we had five to six cases, so it's a fairly high number. That said, I don't lie awake at night worrying about five cases of measles."

All the cases have been traced to foreign countries.

Oregon's five cases involved four members of a Marion County family who were exposed to someone who traveled to Asia.  There's also an infant in Multnomah County who got measles after traveling to Asia unvaccianted.

What concerns him is our high vaccination exemption rate, that makes him nervous.

"We actually have the highest rate of religious exemptions for schools  at 6 percent.  I'm concerned because since 2006, it's been climbing.  Some schools have over 60 percent of unvaccinated kids.  You put a case of measles in a school with a high school vaccination exemption rate, you're going to get an outbreak.  Fortunately we've dodged that bullet so far, but that's the  one thought that makes me nervous."