Natalie Vinkeles Melchers, Wilma Stolk and Luc Coffeng from the Erasmus MC (Department of Public Health) were invited to the World Health Organization (WHO), Department of Neglected Tropical Diseases, to discuss their work on a modeling study on the impact of ivermectin on skin and eye disease due to onchocerciasis with projections up to 2025. Drs. Vinkeles Melchers presented her recent work, and showed an expanded disease framework within the individual-based mathematical ONCHOSIM model. She used the disease module to predict trends in the prevalence of onchocercal eye and skin disease during a 25-year time frame since start of MDA. Predicted prevalence was projected for various clinical manifestations due to onchocerciasis; reversible conditions (itch and reactive skin disease) and irreversible manifestations (skin atrophy, depigmentation, hanging groin, vision loss). The meeting was attended by WHO experts in the field of, among others, onchocerciasis, lymphatic filariasis, Chagas, and was deemed very successful.