The Pan-American Health Organisation said it is aiming to vaccinate 41 million people in 45 Western Hemisphere nations against a variety of diseases in its ninth annual vaccination week.

The effort by the UN agency in the week of April 23-30 coincides with similar vaccination drives in other regions aiming to target polio, influenza and yellow fever, among other diseases.

Health workers, volunteers, government officials and celebrities throughout the Americas are gearing up to participate in what has become the hemisphere’s largest multi-country health effort.

“We have every reason to be proud of vaccination week in the Americas,” said PAHO director Mirta Roses.

“It has not only helped spread the benefits of immunisation to people throughout our hemisphere, it has provided a model for what can be achieved with vaccines if we all work together. Given the tremendous momentum, I am confident that next year – on the 10th anniversary of own initiative – we will see the first truly global vaccination week.”

The agency said Europe will celebrate its sixth initiative, the Eastern Mediterranean will celebrate its second and the African and Western Pacific regions will celebrate their first-ever vaccination weeks bringing participation to more than 180 countries and territories worldwide.

The Americas region was the first to eradicate smallpox, in 1971, and polio in 1991. The last case of en-demic measles in the Americas was reported in 2002, and the last case of endemic rubella in 2009.