"We must protect children and communities against this potentially very serious but entirely preventable infectious disease - and the only way to do that is through vaccination".
From January to March, provisional estimates show more than 100,000 measles cases were reported worldwide - a 300% increase from the same period just one year ago.
He said: 'While vaccine hesitancy may be a factor for a small minority of parents, we know from our parental attitudinal surveys that confidence in the immunisation programme is high - the proportion of parents with concerns that would make them consider not having their child immunised has been at an all-time low for the past three years. To be protected against measles, you need two doses of the vaccine. In developed countries, coverage of the first dose is at 94%, and of the second at 91%.
The UNICEF report said that based on income, the United States list of high-income countries not receiving the first dose of the vaccine (2.5 million children).
The second most affected country was France, with 608,000 unvaccinated children over the same time period, followed by the United Kingdom, with 527,000. In 2017, for example, Nigeria had the highest number of children under one year of age who missed out on the first dose, at almost 4 million. It was followed by India (2.9m), Pakistan and Indonesia (1.2m each), and Ethiopia (1.1m).
Worldwide coverage levels of the second dose of the measles vaccines are even more alarming. And 22 countries in sub-Saharan African have not yet introduced the essential second dose.
Germany ranks eighth among high-income countries with 168,000 cases of children missing the first dose.
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But it lifts the threat that those who work with the U.S. in Iraq and Lebanon , where the Guard's many subsidiaries are active, will face the full weight of USA penalties.
World Health Organization in a statement signed on Wednesday by Collins Boakye-Agyemang, its Spokesman for Africa, listed other countries to include Chad, Cameroon, DR Congo, Liberia, Guinea, Madagascar, Mali, and Uganda.
But now with the recent spike in reported cases, the ADH and other health professionals suggest adults born in 1957 or after should go ahead and get a second booster shot, especially if they are more prone to being exposed to the disease.
"Measles is far too contagious", she continued, "It is critical not only to increase coverage but also to sustain vaccination rates at the right doses to create an umbrella of immunity for everyone".
Health officials in Florida reported the first case in the state last month involving a man from Broward County.
UNICEF's chief of immunizations Robin Nandy said in high-income countries some people aren't recognizing the seriousness of the situation. Infants, pregnant women and people with a weakened immune system are more at risk for serious complications from measles.
UNICEF is part of the Measles and Rubella Initiative, a private-public partnership including WHO, CDC, United Nations Foundation and American Red Cross that spearheads a global push towards measles and rubella elimination and control.