Former President Bill Clinton on August 4 addressed the XVII International AIDS Conference in Mexico City telling thousands “we must do more,” The Wall Street Journal reports.

“AIDS is a big dragon,” Clinton says, but unlike the mythical dragon slain by St. George, “this dragon must be slain by millions and millions of foot soldiers.”

Clinton had arrived from a tour of his foundation’s projects in Africa where because of their efforts some AIDS treatments now cost $60 while three years ago they cost $600.

The William Jefferson Clinton Foundation partners with donors and businesses to promote health and economic development around the world.