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.

“Measles is an airborne, extremely infectious, and potentially severe rash illness,” the CDC’s website says. “Before the measles vaccine was introduced, an estimated 48,000 people were hospitalized and 400–500 people died in the United States each year.”

Health and Human Services Secretary Robert F. Kennedy Jr. has spread misleading claims about vaccinations, and initially downplayed the current spread of measles.

“It’s not unusual,” he said in February when asked about the measles death of a 6-year-old Texas boy. “We have measles outbreaks every year.”

Facing criticism, Kennedy promoted the measles vaccine after attending the funeral of an 8-year-old Texas girl who died from measles at the start of April.

“My intention was to come down here quietly to console the families and to be with the community in their moment of grief,” Kennedy said in a message posted on X.

“The most effective way to prevent the spread of measles is the MMR vaccine,” he added, referring to the measles, mumps and rubella vaccine.

Public health officials have warned that cases will continue to rise.

“Due to the highly contagious nature of this disease, additional cases are likely to occur in the outbreak area and the surrounding communities,” the Texas Department of State Health Services said in its latest update.