Director General of Health, Aiono Dr Alec Ekeroma, told TV1 Samoa the infant was showing symptoms of measles and has been isolated to await results of blood samples sent to New Zealand.
He confirmed two other patients were tested recently and returned negative results.
According to Aiono, the Ministry of Health are continuing the Mumps Measles and Rubella vaccination push around the country.
"We've approved the payment of staff overtime to allow for them to work Saturday," he said.
