There have been 695 measles cases in 22 states, according to the Centers for Disease Control and Prevention.
That's slightly less than the 667 cases reported in all of 2014.
Resurgence of the once-eradicated, highly-contagious disease is linked to the growing anti-vaccine movement in richer nations, which the World Health Organisation (WHO) has identified as a major global health threat.
Symptoms include a high fever, cough, runny nose, red and watery eyes, tiny white spots in the mouth and a red rash on the face that spreads to the extremities.
The Illinois Department of Public Health says it's also expanding outreach in communities with low vaccination rates and educating the public on the importance of vaccines.
The DPH posting said the initial child with measles was unvaccinated and acquired measles on a visit to Israel. Dianne Feinstein said Tuesday that Los Angeles County now has more reports of measles cases. The WHO said "vaccine hesitancy", the "reluctance or refusal to vaccinate despite the availability of vaccines", is one of 10 threats to global health in 2019. They added that the cases aren't related to four earlier cases in people who traveled through LA County earlier this year and that most of the patients were unvaccinated.
"Please get your children vaccinated", he said.
Of those 626 cases, 487 were in people 19 and younger.
The CDC warned that the longer these outbreaks continue, the greater the chance measles will again gain a sustained foothold in the country.
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Thankfully, as of now, no deaths have been reported in connection with the current measles outbreak.
The Los Angeles County Department of Public Health says four cases are linked to one another after global travel, and there's been an additional single case of measles following worldwide travel.
To get the vaccine, Hamilton says the best way is to go to your primary doctor. The vaccine was licensed and then used as part of a vaccination program.
"When enough people make a choice not to vaccinate their children, measles comes back, and that's what we're seeing", he said. If my math is correct, this country is on track to top 2,000 measles cases in 2019.
In background information, the department said that, of the 390 cases, 94 have been reported in April.
Dr. Tim Jones, the state's epidemiologist, says even with just one known measles case, the Tennessee Health Department is taking a proactive approach to curtail the spread of the highly contagious, airborne disease.
As of now, there's not an outbreak in Florida because three or more measles cases would have to be reported.
In 1989, the CDC began recommending two doses of the MMR shot, making the vaccine more effective.