There are now 102 confirmed cases of measles throughout the United States and health authorities expect that figure to rise.
What started as an outbreak at the Disneyland amusement park in California in December has since spread to 14 states.
Most of the victims were unvaccinated, according to the Centers for Disease Control and Prevention.
This latest outbreak has fueled the perennial debate about the pros and cons of the vaccination developed by American vaccinologist Maurice Hilleman in 1968 — and has caught on in other countries.