   Measuring The Impact of Integrated Mass Treatment for Ivermectin and Albendazole for Onchocerciasis in four counties in Liberia and accessing the effectiveness of Preventive Chemotherapy in Reducing Transmission of infection in 2018/2019.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       cessing the effectiveness of Preventive Chemotherapy in Reducing Transmission of 