In October 2016, an outbreak of cholera began in Yemen, and is ongoing until now. In February and March 2017, the outbreak was in decline, but the number of cholera cases resurged after 27 April 2017, reportedly ten days after Sana'a's sewer system stopped working. Devastation of Yemeni infrastructure, health, water and sanitation systems and facilities led to the spread of cholera. Stated by in the statement of the UNICEF and WHO executive directors: "This deadly cholera outbreak is the direct consequence of two years of heavy conflict. Collapsing health, water and sanitation systems have cut off 14.5 million people from regular access to clean water and sanitation, increasing the ability of the disease to spread. Rising rates of malnutrition have weakened children's health and made them more vulnerable to disease. An estimated 30,000 dedicated local health workers who play the largest role in ending this outbreak have not been paid their salaries for nearly 10 months."The outbreak is of an "unprecedented scale", according to the World Health Organization (WHO), one of the worst in recorded history. On oral cholera vaccine campaign was launched, but the shortages of vaccine and money made delivery into all areas difficult. With the right medicines, these [diseases] are all completely treatable.