Children who haven't been vaccinated against measles have been banned from public places in one US county.
Rockland County in New York state has declared a state of emergency amid an ongoing measles outbreak.
From today, anyone under 18 who hasn't been vaccinated is barred from public places until they're vaccinated or until the emergency expires in 30 days.
Officials define public places where "10 persons are intended to congregate" - including restaurants, shops, schools and places of worship.
Unvaccinated children have also been banned from buses or trains, but taxis are not included in the order.
County Executive Ed Day explained: "We must do everything in our power to end this outbreak and protect the health of those who cannot be vaccinated for medical reasons and that of children too young to be vaccinated.
"As this outbreak has continued our inspectors have begun to meet resistance from those they are trying to protect."
He added: "This type of response is unacceptable and irresponsible. It endangers the health and well-being of others and displays a shocking lack of responsibility and concern for others in our community."
Anyone found in violation of the ban will be referred to the local district attorney.
However, police "will not be patrolling or asking for vaccination records".
Authorities are also hosting a free MMR vaccination clinic today.
According to the New York Times, Rockland County has had more than 150 confirmed cases of measles since October.
The newspaper adds that the outbreak has been largely concentrated in ultra-Orthodox Jewish communities in Rockland.
Rockland County is located around an hour's drive from New York City, and has a population of over 300,000 people.
Last month, the UN warned that measles cases worldwide almost doubled in only a year.
According to the World Health Organisation (WHO), by mid-January this year they'd seen just under 230,000 reported cases of measles for 2018 around the world.
That compares to 115,000 cases from 2017 reported at the same time last year.