Less than 50 percent of the health facilities in Yemen are functioning, and those that are operational lack specialists, equipment, and essential drugs . Facilities frequently continue to have empty shelves. The degrading health care system has resulted in vulnerability to and emergence of diseases that are preventable have been eradicated elsewhere. This ranges from the largest cholera outbreaks impacting almost all governorates, to the reemergence of diphtheria and measles, and risk of of polio resurgence. The unprecedented cholera outbreak that began in April 2017 is evidence of serious erosion of the health, water, sanitation and hygiene (WASH) systems. More than 18 million people have limited or no access to safe drinking water, sanitation, or hygiene services.