The new data, from the W.H.O. and C.D.C., alarmed public health experts, who fear the effect of the coronavirus pandemic this year could bring more bad numbers.

Measles deaths worldwide swelled to their highest level in 23 years last year, according to a report released Thursday, a stunning rise for a vaccine-preventable disease and one that public health experts fear could grow as the coronavirus pandemic continues to disrupt immunization and detection efforts.

The global death tally for 2019 — 207,500 — was 50 percent higher than just three years earlier, according to the analysis, released jointly by the World Health Organization and the Centers for Disease Control and Prevention. No measles deaths were reported in the United States, but measles cases in the country hit a record annual high of 1,282 across 31 states, the most since 1992, according to figures updated earlier this month. As recently as 2012, the U.S. case number was 55.

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Public health experts said the soaring numbers are the consequence of years of insufficient vaccination coverage. They worry that the pandemic will exacerbate the spread of measles, a disease that is even more contagious than Covid-19.

“We are worried that there are new gaps in immunity opening because of Covid on top of those that were already there,” said Dr. Natasha Crowcroft, senior technical adviser for measles and rubella at the W.H.O. “We can’t carry on in the same way and expect a different result,” she added, calling for more resources and creative applications of them.

Although reported cases of measles so far have been lower this year, public health experts are holding those figures at arms’ length. They fear such numbers are a drastic undercounting, because of the pandemic’s global disruptions to health care, therefore reducing detection and medical care for measles — as well as prevention efforts.

Measles outbreaks have already occurred this year in at least half of the 26 countries that had to suspend vaccination campaigns because of the pandemic. As of this month, 94 million people are at risk for missing measles vaccines, according to the W.H.O. While measles cases may indeed be somewhat suppressed as a collateral effect of precautions to prevent the spread of the coronavirus, experts say that, at best, the current low figures represent only a temporary lull. Read more at NY Times