Measles is spread when an infected person coughs or sneezes, and it can remain in the air for up to two hours afterward. The disease can lead to serious complications and death, especially among children. The effective way to stop transmission is to immunize 95 percent of a community.
Around the world, there was a substantial decrease in measles incidence and associated deaths between 2000 and 2016. Estimated measles cases plunged 65 percent, from 28.3 million in 2000 to 9.8 million in 2019. Likewise, measles deaths fell from 539,000 to 207,500 in the same period Immunization saved millions of lives; the percent of children getting the first dose of measles vaccine went from 72 percent in 2000 to 84 percent in 2020, according to the Centers for Disease Control and Prevention. Just before the pandemic hit, there was a major global surge in measles cases in 2019, but then it declined in 2020 because of precautions such as face masks to fight the spread of covid-19.
However, the pandemic has sowed trouble. It created logistical hurdles to vaccination campaigns and sapped resources. In a statement on April 27, the World Health Organization and UNICEF reported that 57 campaigns against vaccine-preventable diseases in 43 countries that had been scheduled to take place since the start of the pandemic are still postponed. Of these, 19 are measles campaigns, the suspension of which put 73 million children at risk of measles because of missed vaccinations. Two doses of the safe and effective measles vaccine with high community coverage can protect children, but many of the disrupted campaigns were to provide the second dose. The impact is now being seen: 17,338 measles cases were reported globally in the first two months of this year, twice the 9,665 cases during the first two months of 2021. In the past year, the agencies report 21 large and disruptive measles outbreaks around the world. The top five countries for cases were Somalia, Yemen, Afghanistan, Nigeria and Ethiopia.
The United States, which declared measles eliminated in 2000, had a big spike in 2019, but more recently, cases have been low. More than 90 percent of children are vaccinated by age 24 months with the measles, mumps and rubella vaccine.
In Ukraine, which suffered the second-largest measles outbreak in the world from mid-2017 to the end of 2019, the catch-up campaign was interrupted because of the pandemic and then by war. Ukraine managed to get a first dose to 85 percent of eligible children in 2020, but WHO says it is “seriously concerned about a potential measles outbreak,” and it reports overall immunity in Ukraine remains low.
Measles cannot be permitted to run free. The global immunity gap must be met with renewed vaccination efforts, despite obstacles of the pandemic and war.