Chinese Vice-Premier Wang Yang (left), US Secretary of Commerce Penny Pritzker (center) and US Trade Representative witness the signing of a China-US Memorandum of Understanding in support of the establishment of the Africa centers for disease control and prevention on Wednesday afternoon at the conclusion of the 27th China-US Joint Commission on Commerce and Trade held in Washington. The two sides signed two MOUs on Wednesday. The other is an MOU on select reverse trade mission. Chen Weihua/China Daily