Symptoms include a fever, severe headache, pain behind the eyes, muscle and joint pain, and a blotchy rash.
Those with a more severe type of dengue might experience severe stomach pain, fatigue, vomiting, and blood in vomit or stool.
Vaccines have been introduced in some countries in the region, while others, such as Honduras, plan to start distribution in 2025.
In a statement, Paho urged for stronger mitigation efforts and collaboration across the Americas.
Its director, Dr. Jarbas Barbosa, said the high number of cases is linked to a hotter, wetter climate and factors such as accumulated water around the home and poor waste management, which create breeding grounds for mosquitoes.
He also said the virus is posing a “higher-than-normal” risk to children.
In Guatemala, 70% of dengue-related deaths were children, while in Mexico, Costa Rica and Paraguay, under-15s made up more than a third of severe cases, Paho data showed.
Children and people with pre-existing health conditions are more likely to catch the disease and develop more serious symptoms.
Around half the world’s population live in areas with a risk of contracting the disease, according to the US Centers for Disease Control and Prevention.
It is spread through the bite of an infected mosquito, most commonly the Aedes aegypti.
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