"I would hope that this ends soon, but this could go on for weeks, if not months", said Dr. Alan Melnick, public health director in Clark County, Washington, just north of Portland.
Clark County, Washington, public health officials confirmed Friday there are 42 cases there, along with seven other suspected cases. The law passed in 2015 after a measles outbreak at Disneyland sickened 147 people and spread across the US and into Canada.
Public Health is not providing any additional information about the one case with one dose of MMR in order to protect the patient's privacy, according to the news release. Anyone who becomes sick or thinks they may have been exposed to measles should contact their health care provider immediately and let them know that you may have been exposed to measles.
The AP noted that Clark County, Washington, has a vaccination rate of 78 percent, which is too low to protect those with compromised immune systems, those who can not get vaccinated because of medical problems, or those who are too young. One dose of the measles vaccine gives 93 percent lifelong immunity; a second dose between ages 4 and 6 provides 97 percent immunity.
The best protection against measles is the MMR vaccine, which protects against measles, mumps, and rubella viruses.
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Last year, there were 17 outbreaks and about 350 cases of measles in the U.S. There have also been three reported cases in Atlanta.
The most serious risk is to children who haven't yet received all of their vaccines, and others who can't be vaccinated for medical reasons (for example, because their immune system is suppressed due to another illness).
Of the confirmed cases, 37 are people who were not immunized.
As long as people in the community aren't vaccinated, doctors say there is potential for an outbreak.
The Central District Health Department noted that symptoms include fever, cough, red eyes, sore throat, runny nose and a rash that can spread over the body. People are considered infectious from four days before to four days after the appearance of the rash.