This year, 880 measles cases were reported, already the largest since 1994 federal health officials on Monday.
Last week, a further 41 cases were reported for the control and prevention of disease. Of these, 30 were in the state of New York, which has the strongest outbreak in the country, mainly in Orthodox Jewish communities.
Most of these new cases were New York City and nine were located in the suburb of Rockland County.
Meanwhile cases have been registered in 24 states.
It's still too early to say if the outbreak slows down, a CDC spokesman said. In New York, the transmission of the virus seemed to slow down for a short time in January, but accelerated in February.
Measles transmission tends to fade when warm summer weather arrives, other experts said. It is not clear that this is because children are no longer close to each other in school, that families spend less time indoors, or that droplets containing viruses – such as those with influenza viruses – stay in the air longer in cold, dry air than in warm, moist air.
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In the Pacific Northwest, which has experienced an outbreak that has nothing to do with New York, vaccination rates have even increased on Vashon Island. Wash., Which has long been known for its large number of parents who refuse to vaccinate their children.
In Vashon, a refuge for artists and organic farmers only 22 minutes by ferry from Seattle, more parents have accepted the vaccine for a vaccine combination of reasons, reported The Associated Press.
Many are worried about the outbreak, and some have used the effort to make recordings more available. Some residents are tired of the fact that the island is considered the center of vaccination. The population is changing as wealthier commuters move in.
The immunization rates among kindergarten teachers at public schools on the island rose from 56 percent in 2012 to nearly 74 percent in 2018, according to the Department of Health. This is still well below the 95 per cent quota required to ensure that measles do not spread widely when they are introduced.
On May 10 the state of Washington was exempted from parental rights to apply for a "philosophical exception" for the measles-mumps-rubella vaccine for schoolchildren. The law comes into force in July.
The outbreak of Washington has not reached Vashon Island. It is located in Clark County on the Oregon border.