The states included are: Arkansas, California, Connecticut, Florida, Illinois, Kansas, Louisiana, Maryland, Michigan, Missouri, Nevada, New Jersey, New York, North Carolina, Oklahoma, Oregon, Pennsylvania, Tennessee, Texas, and Washington, and Washington D.C. On Wednesday, two more unvaccinated people living in the same house as the unvaccinated child were reported to have contracted measles.
The disease is still common in parts of Europe, Asia, the Pacific and Africa.
The virus is highly contagious and can linger in the air for about two hours after a person with measles has left the room.
A Measles outbreak affecting several states has many parents on alert. In all of 2017, for example, 118 people from 15 states and DC had measles. Without treatment, symptoms typically disappear within two or three weeks, but one or two out of every 1,000 children will die from complications.
Symptoms include red eyes, cough, runny nose and high fever, which is followed by a red rash spreads all over the body.
Miami Children's Hospital pediatrician Amanda Porro prepares to administer a measles vaccination to Sophie Barquin, 4, as her mother, Gabrielle, holds her January 28.
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Measles was eliminated in the United States in 2000, meaning the disease was no longer regularly found in the country.
The measles vaccine - known as the MMR or measles, mumps and rubella vaccine - is very effective. The first dose of the vaccine is administered at 12 through 15 months of age, while the second dose is taken at four through six years of age. The majority of those cases were in people who were not vaccinated.
Earlier this week, the county reported its first measles case since 1998.
Measles can spread when it reaches a community in the USA where groups of people are unvaccinated.
Unvaccinated infants are especially vulnerable to complications of measles, so the CDC advises they are best protected by herd immunity. The source of the infection was never identified.