Measles is highly contagious.
"They have to get the shot", Trump told reporters at the White House.
A person should not get the vaccine if they are severely immune-compromised, are pregnant or have experienced an allergic reaction to a previous MMR vaccine.
"Vaccination is the only way to ensure you and your family members will not get measles", said State Public Health Officer and CDPH Director Dr. Karen Smith.
Health officials say the infested person also visited a CVS on South Main Street in Southampton that afternoon.
Public Health Isle of Man is issuing advice over MMR jabs after figures on measles cases were published this week.
Repeated studies - the most recent involving more than 650,000 children monitored for more than a decade - have shown that there is no such link. "But I want smaller doses over a longer period of time", Trump said during a presidential primary debate on CNN.
A UNICEF study found that measles deaths were up by 22% in 2017, and complacency and fear of vaccines were among the factors leading to less vaccinations.
"Autism has become an epidemic".
The change relates to the MMR vaccine against measles, mumps and rubella, which children now receive at one year of age, then again as a booster shot at around ten years. It has gotten totally out of control.
The number of cases of the disease had risen 300 percent worldwide in the first three months of 2019 compared to the same period past year, the United Nations said. People without immunity can catch measles just by being in a room for up to two hours after a person with measles has left.
"Measles is one of the most infectious agents we have in the infectious diseases pathogen world", Marrazzo explained.