The global health body said that an estimated 1 billion people received treatment in 2015 alone for neglected tropical diseases (NTDs).
The report said that the largest number of people needing treatment and care - in excess of 100 million - are found in India, Indonesia and Nigeria, which together account for 47 per cent of the total.
"In 2015, the target for the elimination of visceral leishmaniasis was achieved in 82 per cent of sub-districts in India, in 97 per cent of sub-districts in Bangladesh, and in 100 per cent of districts in Nepal," WHO in its new report 'Integrating Neglected Tropical Diseases in Global Health and Development' said.
"The medical poverty trap affects people worldwide, including in Cambodia and Vietnam, where 50-67 per cent of households have incurred debt as a result of dengue, or in Bangladesh, India, Nepal and Sudan, where 25-75 per cent of households in which someone is affected by visceral leishmaniasis have had some type of financial difficulty in obtaining diagnosis and treatment, even when tests and medicines are provided free of charge," it said.
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The effects of discontinuing Mass Drug Administration (MDA) for lymphatic filariasis must be carefully analysed, and remedial action must be taken to ensure that deworming coverage is maintained, the report said, while noting that India has made significant progress and stopped MDA in 72 districts.
The report said that in 2015, 960 million of the 1.59 billion people requiring mass or individual treatment and care for NTDs were living in lower-middle rather than low-income countries.
"Many of the NTDs that cause the highest burden of disease (just five NTDs represent 71 per cent of the total NTD burden) occur predominantly in the largest emerging-market economies in the Group of 20 nations (G20) plus Nigeria, which also has one of the world's largest economies.