However, he said so far nobody had tested positive.
"We are very mindful of the fact that measles is a very infectious disease and that a few cases, in American Samoa will mean that it could easily get across the border," Aiono told RNZ Pacific yesterday evening.
"We're not going to close borders because of it but we will be requiring that anyone travelling to us that they have been vaccinated against measles and that they don't have any symptoms."
Last month, Samoa had suspected cases of measles that came back negative after blood tests were sent to New Zealand.
