The United States' worst measles outbreak in a quarter-century spread to Idaho and Virginia last week as public health authorities on Monday reported 41 new cases of the highly contagious and sometimes deadly disease.
The United States has recorded 60 new measles cases, taking confirmed cases for the year to 940, the worst outbreak since 1994 and since measles was declared eliminated in 2000, federal health officials say.
People heading to Glastonbury, Bestival and other major festivals this summer have been warned they may be at risk of contracting measles because of soaring cases globally and a concerning drop in UK vaccination rates.
The United States has confirmed 695 measles cases so far this year, the highest level since the country declared it had eliminated the virus in 2000, the US Centers for Disease Control and Prevention said on Wednesday.
The number of measles cases worldwide has nearly quadrupled in the first quarter of 2019 to 112,163 against the same period last year, the World Health Organization (WHO) says, citing provisional data.
Australia on Monday launched a major education campaign to encourage its residents, particularly those traveling overseas, to get vaccinated against measles as a sudden spike in cases amid a global resurgence causes alarm.
Thousands of vaccines are being delivered to health centers in New Zealand's Canterbury district, with a measles outbreak widening to 20 confirmed cases as health officials warned that the number is expected to rise over the coming days and weeks.