Kentucky now has 157 confirmed measles cases this year, WKYT reported on Wednesday. That is up from 105 cases reported on Tuesday, WLKY said.

Laurel County in southeastern Kentucky now has the most cases, with 56, WKYT reported. The county health department said the cases are linked to several large households with limited contact with the wider community.

Christian County has 45 cases and Trigg County has 25, both in western Kentucky, the Kentucky Lantern reported.

The number of people in the hospital stayed at nine, WKYT said. No one has died.

Of the 157 cases, 155 were in people who were not vaccinated, the Kentucky Lantern reported, citing state data. One case was in a fully vaccinated person, and one was in someone who had one of the two doses of the MMR vaccine.

Most of the cases are in children and teens. There are 17 cases in children under 5 and 73 in young people ages 5 to 17, the Lantern said. Another 67 cases are in adults.

The latest numbers also added Bath County to the list of places with cases, WKYT reported.

The state has said this is Kentucky's worst year for measles since 1991, the Kentucky Lantern reported. That year the state had 443 cases.

Measles is very contagious. One sick person can infect nine out of 10 people near them who are not protected, the Lantern reported, citing the Centers for Disease Control and Prevention.

The US is seeing measles come back, the Lantern said. As of Oct. 8, the country had more than 4,000 confirmed cases and 42 outbreaks, according to the CDC.

Health officials are urging families to make sure children get the MMR vaccine. WLKY said people who think they have measles should call their doctor before going in, so staff can keep the virus from spreading.

What we know: Kentucky's measles count rose to 157 on Wednesday, led by a fast-growing cluster in Laurel County.
What we don't: How far the Laurel County outbreak will spread, and when cases will peak.