Social factors make poor countries particularly vulnerable to an influenza pandemic and they are less able to afford vaccines and antiviral medicines. GlaxoSmithKline (GSK) has invested over USD 2 billion in research and expanded production capacity for its antiviral medicine, Relenza, and for its pre-pandemic and pandemic influenza vaccines. It has set a preferential price for Relenza for Least-Developed Countries (LDCs) and has granted Simcere, China, a voluntary licence to make zanamivir and sell it in China, Indonesia, Thailand, Vietnam and all LDCs.