The number of measles cases reported worldwide in the first three months of 2019 has tripled compared with the same time last year, according to the World Health Organization (WHO).

The CDC report did not say whether there have been any fatalities.

Some adults may need a vaccination booster for highly contagious infectious diseases

How do you catch the measles?

In Rockland County, New York, a state of emergency has been declared over an outbreak of measles - a disease officially eradicated in the US in 2000, but whose re-emergence has triggered a backlash of blame and recriminations.