The number of measles cases in the U.S. this year is at the second-highest level in 25 years.

The Centers for Disease Control and Prevention is reporting 90 new cases of measles in the U.S. bringing the number of cases this year to 555.

While 20 states have reported cases, New York has been the epicenter. Nearly two-thirds of all cases have been in New York, and 85% of the latest week's cases came from the state. Most of the New York cases have been unvaccinated people in Orthodox Jewish communities.

No fatalities have been reported in the United States from measles this year.

The CDC says states that have reported cases are Arizona, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, Massachusetts, Michigan, Missouri, Nevada (Clark County), New Hampshire, New Jersey, New York, Oregon, Texas, and Washington.

The World Health Organization is also reporting Monday that 110,000 measles cases were reported worldwide this year January to March, an increase of nearly 300% from the same period last year.

The CDC says, in the U.S., the disease killed hundreds of people and hospitalized 48,000 each year, before the first measles vaccine became available in 1963.

(The Associated Press contributed to this report.)