Mbocytes, and endothelial cells[43]. NS1 is a glycoprotein that is secreted by infected cells, heavily present in patient serum supernatants, lacks a membrane spanning motif, but is not, itself, present in the virus. NS1 is known to be a major immune target and high concentrations of antiNS1 antibodies have been found in severe disease in patient studies[44]. When cells are exposed to NS1 antibodi