Measles cases in Britain tripled a year ago as the disease surged across Europe.
Experts can't say for sure where the next outbreak might be.
As stated by to the state health department, orders for two types of measles medicines in Clark County increased by nearly 500 percent in January compared with the same month a year ago, from 530 doses to 3,150.
The "anti-vaxxers" movement still thrives in many pockets of the United States.
A report published by the European Commission previous year and compiled by a team led by Ms Larson found measles immunisation coverage had fallen in 12 EU countries since 2010, and seven out of the 10 countries with the lowest vaccine confidence in the world were in Europe.
Washington now has a sufficient supply of MMR vaccine for children and adults; however, as the outbreak continues, vaccine supply may be affected.
Adult vaccination numbers in the county also rose.
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According to the World Health Organization (WHO), vaccination is one of the most cost-effective ways of avoiding disease - it now prevents 2-3 million deaths a year, and a further 1.5 million could be avoided if global coverage of vaccinations improved. The second dose provides 97 percent protection.
Five of the cases involved young children, some of whom received one round of the two-part vaccine. Almost 500 adults were vaccinated in the first week of February, up from an average of 176 in the years before. Health investigators in the city have determined that the first case was identified in an unvaccinated child who was exposed to measles during travel to Israel.
But it's a snapshot of the scare an outbreak can cause, said Dr. Alan Melnick, the Clark County health officer overseeing the response.
The announcements come as a measles outbreak hits the Pacific Northwest, where more than 50 cases have been confirmed.
"We are feeling this in every country even if at a national level we have good health policies in place". Many proponents claim, without evidence, that vaccinations can cause autism.
Depending on the relevant state and territory health departments, in Australia, there are some governmen-funded catch up vaccination programs for refugees and migrants.
Dr Zsuzsanna Jakab, WHO regional director for Europe, said: "The picture for 2018 makes it clear that the current pace of progress in raising immunisation rates will be insufficient to stop measles circulation".