A deadly and fast-spreading measles outbreak that started in western Texas in January has spread across the United States, with nearly 900 cases now reported.

There are currently 884 confirmed cases of measles across the U.S., according to Friday data from the Centers for Disease Control and Prevention. The majority of those cases come from Texas, where 646 cases have been confirmed in the state since late January. Of all U.S. cases, 94 people have been hospitalized.

Cases have now been confirmed in 29 states. Six states ― Kansas, Michigan, New Mexico, Ohio and Texas ― have reported outbreaks, meaning there are three or more related cases.

Texas has seen a rise of 22 cases since Tuesday, according to the Texas Department of State Health Services.

Three deaths have been reported since the outbreak began, two of which were school-aged children in Texas who had not been vaccinated. Data from the CDC shows that 97% of cases in the U.S. came from people who are unvaccinated or whose vaccination status is unknown.