But you don't need to go as far as Madagascar - common tourist destinations like England, France, Italy and Greece had measles outbreaks a year ago.
Under the mandatory vaccinations, members of the city's Department of Health and Mental Hygiene will check the vaccination records of any individual who may have been in contact with infected patients. At least 285 people have contracted the disease in the city since September, mostly in Brooklyn's Williamsburg neighborhood. Most of these cases (more than 85%) have been in children under age 18. Barbot said that 21 people have been hospitalized, and five have ended up in the intensive care unit.
This is the largest outbreak in the city in almost three decades.
"There's no question that vaccines are safe, effective and life-saving", de Blasio said in a statement.
The CDC recommends that all children get two doses of measles vaccine. "It is safe, it is effective, it is time-tested. the faster everyone heeds the order, the faster we can lift it". Those who didn't get the vaccine or are not immune to the virus may be fined $1,000.
His order noted that the outbreak has persisted despite earlier orders "excluding unvaccinated children from attending preschools and daycare programs, because a high rate of people living within Williamsburg have not been vaccinated against measles" and this his department is "responsible for controlling communicable diseases". "We have to stop it now".
Some Orthodox Jews have resisted vaccines.
The mayor's office placed the blame largely on intentional campaigns to discredit the safety of vaccinations - the so-called anti-vax movement that has gained prominence across the United States.
"It's true that a lot of people have measles and measles are not a very good thing, but I think the vaccine also not a very good thing", said Aron Braver, a neighbourhood resident.
The city has also threatened to shut down yeshivas, or traditional Jewish religious schools, if they do not follow an order to keep unvaccinated children out of class.
Insured adults and children will be covered. Those who have not received the MMR vaccine or do not have evidence of immunity may be given a violation and could be fined $1,000.
Q: Why so many cases in New York's Orthodox Jewish communities?
"In Judaism, the majority has the right to dictate what takes place in the public space to ward off danger".
Some residents - even those who support vaccination - said they felt uncomfortable with the city pushing vaccines on people who did not want them. The outbreak began when, according to health officials, an unvaccinated child became infected with the illness while visiting Israel.
She also urged parents to avoid the practice of "measles parties", which she said has contributed to the outbreak.
It's not the first time a recent measles outbreak has circulated nearly entirely among the Orthodox Jewish community in NY.