Originally Posted by Loki882
SHIELD had a cure for Extremis, that's what Agent Ward shot Peterson with.
As others pointed out: he was shot with a sleep agent, not an Extremis cure. And what FitzSimmons came up with was a completely untested elixir that, by sheer dumb luck, happened to work well on the combination of Extremis, alien tech, and gamma radiation that was in the Centipede device.
So no, SHIELD does not have "a cure for Extremis" in AOS.